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Sincerelly i m not so expert with c++ RAII features. I never used before. Anyway i m begining to study about it (i m in "kernel panic"). Compiling a module i have the following error :
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h: In instantiation of ‘void std::unique_ptr<_Tp [], _Dp>::reset(_Up) [with _Up = char*; <template-parameter-2-2> = void; _Tp = const char; _Dp = std::default_delete<const char []>]’:
/usr/include/c++/6/bits/unique_ptr.h:539:9: required from ‘typename std::enable_if<std::__and_<std::__and_<std::is_array<_Up>, std::is_same<typename std::unique_ptr<_Tp [], _Dp>::_Pointer::type, _Tp*>, std::is_same<typename std::unique_ptr<_Up, _Ep>::pointer, typename std::unique_ptr<_Up, _Ep>::element_type*>, std::is_convertible<typename std::unique_ptr<_Up, _Ep>::element_type (*)[], _Tp (*)[]>, std::__or_<std::__and_<std::is_reference<_Dp>, std::is_same<_T2, _U2> >, std::__and_<std::__not_<std::is_reference<_Dp> >, std::is_convertible<_Ep, _Dp> > > >, std::is_assignable<_T2&, _U2&&> >::value, std::unique_ptr<_Tp [], _Dp>&>::type std::unique_ptr<_Tp [], _Dp>::operator=(std::unique_ptr<_Up, _Ep>&&) [with _Up = char []; _Ep = std::default_delete<char []>; _Tp = const char; _Dp = std::default_delete<const char []>; typename std::enable_if<std::__and_<std::__and_<std::is_array<_Up>, std::is_same<typename std::unique_ptr<_Tp [], _Dp>::_Pointer::type, _Tp*>, std::is_same<typename std::unique_ptr<_Up, _Ep>::pointer, typename std::unique_ptr<_Up, _Ep>::element_type*>, std::is_convertible<typename std::unique_ptr<_Up, _Ep>::element_type (*)[], _Tp (*)[]>, std::__or_<std::__and_<std::is_reference<_Dp>, std::is_same<_T2, _U2> >, std::__and_<std::__not_<std::is_reference<_Dp> >, std::is_convertible<_Ep, _Dp> > > >, std::is_assignable<_T2&, _U2&&> >::value, std::unique_ptr<_Tp [], _Dp>&>::type = std::unique_ptr<const char []>&]’
java/rocksjni/compaction_filter_factory_jnicallback.cc:33:58: required from here
/usr/include/c++/6/bits/unique_ptr.h:614:6: error: no matching function for call to ‘swap(const char*&, char*&)’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_pair.h:59:0,
from /usr/include/c++/6/bits/stl_algobase.h:64,
from /usr/include/c++/6/memory:62,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/move.h:179:5: note: candidate: template<class _Tp> typename std::enable_if<std::__and_<std::is_move_constructible<_Tp>, std::is_move_assignable<_Tp> >::value>::type std::swap(_Tp&, _Tp&)
swap(_Tp& __a, _Tp& __b)
^~~~
/usr/include/c++/6/bits/move.h:179:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: deduced conflicting types for parameter ‘_Tp’ (‘const char*’ and ‘char*’)
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_pair.h:59:0,
from /usr/include/c++/6/bits/stl_algobase.h:64,
from /usr/include/c++/6/memory:62,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/move.h:202:5: note: candidate: template<class _Tp, long unsigned int _Nm> typename std::enable_if<std::__is_swappable<_Tp>::value>::type std::swap(_Tp (&)[_Nm], _Tp (&)[_Nm])
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
^~~~
/usr/include/c++/6/bits/move.h:202:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘_Tp [_Nm]’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
from /usr/include/c++/6/memory:62,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/stl_pair.h:471:5: note: candidate: template<class _T1, class _T2> void std::swap(std::pair<_T1, _T2>&, std::pair<_T1, _T2>&)
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^~~~
/usr/include/c++/6/bits/stl_pair.h:471:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::pair<_T1, _T2>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/string:52:0,
from /usr/include/c++/6/stdexcept:39,
from /usr/include/c++/6/array:39,
from /usr/include/c++/6/tuple:39,
from /usr/include/c++/6/functional:55,
from /usr/include/c++/6/memory:79,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/basic_string.h:5287:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> void std::swap(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~
/usr/include/c++/6/bits/basic_string.h:5287:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/tuple:39:0,
from /usr/include/c++/6/functional:55,
from /usr/include/c++/6/memory:79,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/array:275:5: note: candidate: template<class _Tp, long unsigned int _Nm> void std::swap(std::array<_Tp, _Nm>&, std::array<_Tp, _Nm>&)
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^~~~
/usr/include/c++/6/array:275:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::array<_Tp, _Nm>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/functional:55:0,
from /usr/include/c++/6/memory:79,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/tuple:1546:5: note: candidate: template<class ... _Elements> void std::swap(std::tuple<_Elements ...>&, std::tuple<_Elements ...>&)
swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y)
^~~~
/usr/include/c++/6/tuple:1546:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::tuple<_Elements ...>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/memory:79:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/functional:2238:5: note: candidate: template<class _Res, class ... _Args> void std::swap(std::function<_Res(_ArgTypes ...)>&, std::function<_Res(_ArgTypes ...)>&)
swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y)
^~~~
/usr/include/c++/6/functional:2238:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/compaction_filter_factory_jnicallback.h:13,
from java/rocksjni/compaction_filter_factory_jnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::function<_Res(_ArgTypes ...)>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h: In instantiation of ‘void std::unique_ptr<_Tp [], _Dp>::reset(_Up) [with _Up = char*; <template-parameter-2-2> = void; _Tp = const char; _Dp = std::default_delete<const char []>]’:
/usr/include/c++/6/bits/unique_ptr.h:539:9: required from ‘typename std::enable_if<std::__and_<std::__and_<std::is_array<_Up>, std::is_same<typename std::unique_ptr<_Tp [], _Dp>::_Pointer::type, _Tp*>, std::is_same<typename std::unique_ptr<_Up, _Ep>::pointer, typename std::unique_ptr<_Up, _Ep>::element_type*>, std::is_convertible<typename std::unique_ptr<_Up, _Ep>::element_type (*)[], _Tp (*)[]>, std::__or_<std::__and_<std::is_reference<_Dp>, std::is_same<_T2, _U2> >, std::__and_<std::__not_<std::is_reference<_Dp> >, std::is_convertible<_Ep, _Dp> > > >, std::is_assignable<_T2&, _U2&&> >::value, std::unique_ptr<_Tp [], _Dp>&>::type std::unique_ptr<_Tp [], _Dp>::operator=(std::unique_ptr<_Up, _Ep>&&) [with _Up = char []; _Ep = std::default_delete<char []>; _Tp = const char; _Dp = std::default_delete<const char []>; typename std::enable_if<std::__and_<std::__and_<std::is_array<_Up>, std::is_same<typename std::unique_ptr<_Tp [], _Dp>::_Pointer::type, _Tp*>, std::is_same<typename std::unique_ptr<_Up, _Ep>::pointer, typename std::unique_ptr<_Up, _Ep>::element_type*>, std::is_convertible<typename std::unique_ptr<_Up, _Ep>::element_type (*)[], _Tp (*)[]>, std::__or_<std::__and_<std::is_reference<_Dp>, std::is_same<_T2, _U2> >, std::__and_<std::__not_<std::is_reference<_Dp> >, std::is_convertible<_Ep, _Dp> > > >, std::is_assignable<_T2&, _U2&&> >::value, std::unique_ptr<_Tp [], _Dp>&>::type = std::unique_ptr<const char []>&]’
java/rocksjni/comparatorjnicallback.cc:34:21: required from here
/usr/include/c++/6/bits/unique_ptr.h:614:6: error: no matching function for call to ‘swap(const char*&, char*&)’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_pair.h:59:0,
from /usr/include/c++/6/bits/stl_algobase.h:64,
from /usr/include/c++/6/memory:62,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/move.h:179:5: note: candidate: template<class _Tp> typename std::enable_if<std::__and_<std::is_move_constructible<_Tp>, std::is_move_assignable<_Tp> >::value>::type std::swap(_Tp&, _Tp&)
swap(_Tp& __a, _Tp& __b)
^~~~
/usr/include/c++/6/bits/move.h:179:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: deduced conflicting types for parameter ‘_Tp’ (‘const char*’ and ‘char*’)
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_pair.h:59:0,
from /usr/include/c++/6/bits/stl_algobase.h:64,
from /usr/include/c++/6/memory:62,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/move.h:202:5: note: candidate: template<class _Tp, long unsigned int _Nm> typename std::enable_if<std::__is_swappable<_Tp>::value>::type std::swap(_Tp (&)[_Nm], _Tp (&)[_Nm])
swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
^~~~
/usr/include/c++/6/bits/move.h:202:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘_Tp [_Nm]’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/bits/stl_algobase.h:64:0,
from /usr/include/c++/6/memory:62,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/stl_pair.h:471:5: note: candidate: template<class _T1, class _T2> void std::swap(std::pair<_T1, _T2>&, std::pair<_T1, _T2>&)
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^~~~
/usr/include/c++/6/bits/stl_pair.h:471:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::pair<_T1, _T2>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/string:52:0,
from /usr/include/c++/6/stdexcept:39,
from /usr/include/c++/6/array:39,
from /usr/include/c++/6/tuple:39,
from /usr/include/c++/6/functional:55,
from /usr/include/c++/6/memory:79,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/basic_string.h:5287:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> void std::swap(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~
/usr/include/c++/6/bits/basic_string.h:5287:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/tuple:39:0,
from /usr/include/c++/6/functional:55,
from /usr/include/c++/6/memory:79,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/array:275:5: note: candidate: template<class _Tp, long unsigned int _Nm> void std::swap(std::array<_Tp, _Nm>&, std::array<_Tp, _Nm>&)
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^~~~
/usr/include/c++/6/array:275:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::array<_Tp, _Nm>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/functional:55:0,
from /usr/include/c++/6/memory:79,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/tuple:1546:5: note: candidate: template<class ... _Elements> void std::swap(std::tuple<_Elements ...>&, std::tuple<_Elements ...>&)
swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y)
^~~~
/usr/include/c++/6/tuple:1546:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::tuple<_Elements ...>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6/memory:79:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/functional:2238:5: note: candidate: template<class _Res, class ... _Args> void std::swap(std::function<_Res(_ArgTypes ...)>&, std::function<_Res(_ArgTypes ...)>&)
swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y)
^~~~
/usr/include/c++/6/functional:2238:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/6/memory:81:0,
from ./java/./rocksjni/comparatorjnicallback.h:13,
from java/rocksjni/comparatorjnicallback.cc:9:
/usr/include/c++/6/bits/unique_ptr.h:614:6: note: mismatched types ‘std::function<_Res(_ArgTypes ...)>’ and ‘std::__tuple_element_t<0ul, std::tuple<const char*, std::default_delete<const char []> > > {aka const char*}’
swap(std::get<0>(_M_t), __p);
I m not sure to understand this stack trace but it seams there is a mismatch in the unique_ptr . Maybe const char* and char*.
the class where there is the bug is :
CompactionFilterFactoryJniCallback::CompactionFilterFactoryJniCallback(
JNIEnv* env, jobject jcompaction_filter_factory)
: JniCallback(env, jcompaction_filter_factory) {
// Note: The name of a CompactionFilterFactory will not change during
// it's lifetime, so we cache it in a global var
jmethodID jname_method_id =
AbstractCompactionFilterFactoryJni::getNameMethodId(env);
if(jname_method_id == nullptr) {
// exception thrown: NoSuchMethodException or OutOfMemoryError
return;
}
jstring jname =
(jstring)env->CallObjectMethod(m_jcallback_obj, jname_method_id);
if(env->ExceptionCheck()) {
// exception thrown
return;
}
jboolean has_exception = JNI_FALSE;
// line 33
m_name = JniUtil::copyString(env, jname, &has_exception); // also releases jname
if (has_exception == JNI_TRUE) {
// exception thrown
return;
}
m_jcreate_compaction_filter_methodid =
AbstractCompactionFilterFactoryJni::getCreateCompactionFilterMethodId(env);
if(m_jcreate_compaction_filter_methodid == nullptr) {
// exception thrown: NoSuchMethodException or OutOfMemoryError
return;
}
}
const char* CompactionFilterFactoryJniCallback::Name() const {
return m_name.get();
}
std::unique_ptr<CompactionFilter> CompactionFilterFactoryJniCallback::CreateCompactionFilter(
const CompactionFilter::Context& context) {
jboolean attached_thread = JNI_FALSE;
JNIEnv* env = getJniEnv(&attached_thread);
assert(env != nullptr);
jlong addr_compaction_filter = env->CallLongMethod(m_jcallback_obj,
m_jcreate_compaction_filter_methodid,
static_cast<jboolean>(context.is_full_compaction),
static_cast<jboolean>(context.is_manual_compaction));
if(env->ExceptionCheck()) {
// exception thrown from CallLongMethod
env->ExceptionDescribe(); // print out exception to stderr
releaseJniEnv(attached_thread);
return nullptr;
}
auto* const cff = reinterpret_cast<CompactionFilter*>(addr_compaction_filter);
releaseJniEnv(attached_thread);
return std::unique_ptr<CompactionFilter>(cff);
}
It is not clear how to read this stack trace for identifying the problem. I would appreciate to receive a little suggestion for understand how fix the problem and read the stack trace.
The error says that you have a std::unique_ptr<char const[]> object on which you try to call function reset passing char* as an argument.
Well, that argument needs to be char const* for that to compile, which you can achieve with a const_cast, e.g.:
std::unique_ptr<char const[]> p;
char* q = new char[1]{};
p.reset(const_cast<char const*>(q));
Looks like JniUtil::copyString returns std::unique_ptr<char[]> and you assign it to std::unique_ptr<char const[]> which causes the error.
One fix is to change the type of m_name to be std::unique_ptr<char[]>.
Another is to manually add constness (adding constness is safe and is an implicit conversion, but is needed here to choose the correct overload of std::unique_ptr<>::reset):
m_name.reset(const_cast<char const*>(JniUtil::copyString(...).release()));
I'm trying to implement a custom doubly linked list which works with std::find and other algorithms, I made a iterator for it which works with for loop however it does not work and is giving me a lot of errors, where do you think my problem is?
here is my simplified code:
template<typename T, class Allocator = std::allocator<T>>
class MyList {
private:
class Link {
public:
T item;
std::shared_ptr<Link> next; // next item
std::shared_ptr<Link> prev; // previous item
};
std::shared_ptr<Link> head;
std::shared_ptr<Link> tail;
public:
using allocator_type = Allocator;
using reference_link = T &;
class iterator {
public:
typedef iterator self_type;
typedef Link value_type;
typedef Link &reference;
typedef std::shared_ptr<Link> pointer;
typedef std::forward_iterator_tag iterator_category;
typedef int difference_type;
iterator(pointer ptr) : _link(ptr) { }
self_type operator++() {
std::shared_ptr<Link> temp{new Link};
if (_link->next) {
temp->item = _link->next->item;
temp->next = _link->next->next;
temp->prev = _link->next->prev;
}
else {
temp->next = nullptr;
temp->prev = _link->prev->next;
}
this->_link = temp;
return *this;
}
self_type operator++(int junk) {
std::shared_ptr<Link> temp{new Link};
if (_link->next) {
temp->item = _link->next->item;
temp->next = _link->next->next;
temp->prev = _link->next->prev;
}
else {
temp->next = nullptr;
temp->prev = _link->prev->next;
}
this->_link = temp;
return *this;
}
reference operator*() { return *_link; }
pointer operator->() { return _link; }
bool operator==(const self_type &l) const {
if (_link->next == l._link->next && _link->prev == l._link->prev && _link->item == l._link->item) {
return true;
}
return false;
}
bool operator!=(const self_type &l) const {
return !operator==(l);
}
friend bool operator==(const iterator &lhs, const T &rhs) {
if (lhs->item == rhs) {
return true;
}
return false;
};
private:
pointer _link;
};
iterator begin();
iterator end();
using iterator = iterator;
using const_iterator = const iterator;
};
template<typename T, class Allocator>
typename MyList<T, Allocator>::iterator MyList<T, Allocator>::begin() {
return iterator{tail};
}
template<typename T, class Allocator>
typename MyList<T, Allocator>::iterator MyList<T, Allocator>::end() {
return (iterator{head})++;
}
This one works fine:
MyList<int, std::allocator<int>> m_list{1, 2, 3,};
for (MyList<int, std::allocator<int>>::iterator i = m_list.begin();
i != m_list.end(); ++i) {
std::cout << i->item;
}
but this gives me many error:
auto result1 = std::find(m_list.begin(), m_list.end(), 3 );
Which some are these:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h: In instantiation of ‘_InputIterator std::__find(_InputIterator, _InputIterator, const _Tp&, std::input_iterator_tag) [with _InputIterator = MyList<int, std::allocator<int> >::iterator; _Tp = int]’:
/usr/include/c++/4.8/bits/stl_algo.h:4441:45: required from ‘_IIter std::find(_IIter, _IIter, const _Tp&) [with _IIter = MyList<int, std::allocator<int> >::iterator; _Tp = int]’
/home/epezhman/cpp/Part1/assignment4/src/main.cpp:44:63: required from here
/usr/include/c++/4.8/bits/stl_algo.h:139:46: error: no match for ‘operator==’ (operand types are ‘MyList<int, std::allocator<int> >::Link’ and ‘const int’)
while (__first != __last && !(*__first == __val))
^
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: candidates are:
In file included from /usr/include/c++/4.8/random:52:0,
from /usr/include/c++/4.8/bits/stl_algo.h:65,
from /usr/include/c++/4.8/algorithm:62,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/random.tcc:2030:5: note: template<class _RealType1> bool std::operator==(const std::normal_distribution<_RealType>&, const std::normal_distribution<_RealType>&)
operator==(const std::normal_distribution<_RealType>& __d1,
^
/usr/include/c++/4.8/bits/random.tcc:2030:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::normal_distribution<_RealType>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/vector:64:0,
from /usr/include/c++/4.8/bits/random.h:34,
from /usr/include/c++/4.8/random:50,
from /usr/include/c++/4.8/bits/stl_algo.h:65,
from /usr/include/c++/4.8/algorithm:62,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_vector.h:1404:5: note: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
^
/usr/include/c++/4.8/bits/stl_vector.h:1404:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::vector<_Tp, _Alloc>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/iterator:66:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:4,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stream_iterator.h:130:5: note: template<class _Tp, class _CharT, class _Traits, class _Dist> bool std::operator==(const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&, const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&)
operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
^
/usr/include/c++/4.8/bits/stream_iterator.h:130:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/bits/locale_facets.h:48:0,
from /usr/include/c++/4.8/bits/basic_ios.h:37,
from /usr/include/c++/4.8/ios:44,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:2,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/streambuf_iterator.h:204:5: note: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
^
/usr/include/c++/4.8/bits/streambuf_iterator.h:204:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:82:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:338:5: note: template<class _Tp> bool std::operator==(std::nullptr_t, const std::shared_ptr<_Tp1>&)
operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
^
/usr/include/c++/4.8/bits/shared_ptr.h:338:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: cannot convert ‘__first.MyList<T, Allocator>::iterator::operator*<int, std::allocator<int> >()’ (type ‘MyList<int, std::allocator<int> >::Link’) to type ‘std::nullptr_t’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:82:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:333:5: note: template<class _Tp> bool std::operator==(const std::shared_ptr<_Tp1>&, std::nullptr_t)
operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
^
/usr/include/c++/4.8/bits/shared_ptr.h:333:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::shared_ptr<_Tp1>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:82:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr.h:327:5: note: template<class _Tp1, class _Tp2> bool std::operator==(const std::shared_ptr<_Tp1>&, const std::shared_ptr<_Tp2>&)
operator==(const shared_ptr<_Tp1>& __a,
^
/usr/include/c++/4.8/bits/shared_ptr.h:327:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::shared_ptr<_Tp1>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
from /usr/include/c++/4.8/memory:82,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1040:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1040:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: cannot convert ‘__first.MyList<T, Allocator>::iterator::operator*<int, std::allocator<int> >()’ (type ‘MyList<int, std::allocator<int> >::Link’) to type ‘std::nullptr_t’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
from /usr/include/c++/4.8/memory:82,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1035:5: note: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1035:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::__shared_ptr<_Tp, _Lp>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/bits/shared_ptr.h:52:0,
from /usr/include/c++/4.8/memory:82,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/shared_ptr_base.h:1029:5: note: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
operator==(const __shared_ptr<_Tp1, _Lp>& __a,
^
/usr/include/c++/4.8/bits/shared_ptr_base.h:1029:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::__shared_ptr<_Tp1, _Lp>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:81:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:500:5: note: template<class _Tp, class _Dp> bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
^
/usr/include/c++/4.8/bits/unique_ptr.h:500:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: cannot convert ‘__first.MyList<T, Allocator>::iterator::operator*<int, std::allocator<int> >()’ (type ‘MyList<int, std::allocator<int> >::Link’) to type ‘std::nullptr_t’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:81:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:495:5: note: template<class _Tp, class _Dp> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
^
/usr/include/c++/4.8/bits/unique_ptr.h:495:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:81:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h:489:5: note: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
operator==(const unique_ptr<_Tp, _Dp>& __x,
^
/usr/include/c++/4.8/bits/unique_ptr.h:489:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:79:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/functional:2543:5: note: template<class _Res, class ... _Args> bool std::operator==(std::nullptr_t, const std::function<_Res(_ArgTypes ...)>&)
operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept
^
/usr/include/c++/4.8/functional:2543:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: cannot convert ‘__first.MyList<T, Allocator>::iterator::operator*<int, std::allocator<int> >()’ (type ‘MyList<int, std::allocator<int> >::Link’) to type ‘std::nullptr_t’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/memory:79:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/functional:2537:5: note: template<class _Res, class ... _Args> bool std::operator==(const std::function<_Res(_ArgTypes ...)>&, std::nullptr_t)
operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept
^
/usr/include/c++/4.8/functional:2537:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::function<_Res(_ArgTypes ...)>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/functional:55:0,
from /usr/include/c++/4.8/memory:79,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/tuple:813:5: note: template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const std::tuple<_Elements ...>&, const std::tuple<_Elements ...>&)
operator==(const tuple<_TElements...>& __t,
^
/usr/include/c++/4.8/tuple:813:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::tuple<_Elements ...>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/tuple:39:0,
from /usr/include/c++/4.8/functional:55,
from /usr/include/c++/4.8/memory:79,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/array:228:5: note: template<class _Tp, long unsigned int _Nm> bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
/usr/include/c++/4.8/array:228:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::array<_Tp, _Nm>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/stdexcept:39,
from /usr/include/c++/4.8/array:38,
from /usr/include/c++/4.8/tuple:39,
from /usr/include/c++/4.8/functional:55,
from /usr/include/c++/4.8/memory:79,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2519:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2519:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/stdexcept:39,
from /usr/include/c++/4.8/array:38,
from /usr/include/c++/4.8/tuple:39,
from /usr/include/c++/4.8/functional:55,
from /usr/include/c++/4.8/memory:79,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2507:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator==(const _CharT* __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2507:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: mismatched types ‘const _CharT*’ and ‘MyList<int, std::allocator<int> >::Link’
while (__first != __last && !(*__first == __val))
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/stdexcept:39,
from /usr/include/c++/4.8/array:38,
from /usr/include/c++/4.8/tuple:39,
from /usr/include/c++/4.8/functional:55,
from /usr/include/c++/4.8/memory:79,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:1,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2493:5: note: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
operator==(const basic_string<_CharT>& __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2493:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/4.8/algorithm:62:0,
from /home/epezhman/cpp/Part1/assignment4/exercise_1/include/my_list.h:5,
from /home/epezhman/cpp/Part1/assignment4/src/main.cpp:1:
/usr/include/c++/4.8/bits/stl_algo.h:139:46: note: ‘MyList<int, std::allocator<int> >::Link’ is not derived from ‘const std::basic_string<_CharT>’
while (__first != __last && !(*__first == __val))
It looks like your value_type and reference should use T not Link. (You want to iterate over the values, not the links containing them.) operator * and operator -> need to change appropriately.
I have overloaded allocator for most of the stl containers below is the code. The code is from here
#include <iostream>
#include <vector>
#include <list>
namespace outside
{
template<typename T>
struct MyAllocator
{
typedef typename std::allocator<T>::value_type value_type;
typedef typename std::allocator<T>::pointer pointer;
typedef typename std::allocator<T>::const_pointer const_pointer;
typedef typename std::allocator<T>::reference reference;
typedef typename std::allocator<T>::const_reference const_reference;
typedef typename std::allocator<T>::size_type size_type;
pointer allocate (size_type n, typename std::allocator<void>::const_pointer hint=0)
{
std::cerr << "allocate..." << std::endl;
return std::allocator<T>{}.allocate(n, hint);
}
void deallocate (pointer p, size_type n)
{
std::cerr << "deallocate..." << std::endl;
return std::allocator<T>{}.deallocate(p, n);
}
template <class Type> struct rebind
{
typedef MyAllocator<Type> other;
};
MyAllocator()
{
}
MyAllocator(const MyAllocator<T>& other )
{
}
template< class U >
MyAllocator( const MyAllocator<U>& other )
{
}
};
} // namespace outside
namespace outer
{
template<class T>
using vector = ::std::vector<T, outside::MyAllocator<T>>;
template<class T>
using list = ::std::list<T, outside::MyAllocator<T>>;
}
int main()
{
outer::vector<int> myVector1;
outer::vector<int> myVector2;
myVector1.push_back(10);
myVector1.push_back(20);
// myVector2 = myVector1; // Getting compilation error
for (auto i = myVector1.begin(); i != myVector1.end(); ++i) {
std::cout << *i << ' ';
}
std::list<int> myList1;
std::list<int> myList2;
myList2 = myList1; // // No compilation error
}
Copying one vector to another vector is giving me error. While for the same code copying one list to another list is working fine.
Compilation error
included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc: In instantiation of 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = int; _Alloc = outside::MyAllocator<int>]':
prog.cpp:59:15: required from here
/usr/include/c++/5/bits/vector.tcc:176:37: error: no match for 'operator!=' (operand types are 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' and 'const _Tp_alloc_type {aka const outside::MyAllocator<int>}')
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/iosfwd:40:0,
from /usr/include/c++/5/ios:38,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/postypes.h:221:5: note: candidate: template<class _StateT> bool std::operator!=(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
^
/usr/include/c++/5/bits/postypes.h:221:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::fpos<_StateT>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/bits/stl_algobase.h:64:0,
from /usr/include/c++/5/bits/char_traits.h:39,
from /usr/include/c++/5/ios:40,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/stl_pair.h:227:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator!=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
^
/usr/include/c++/5/bits/stl_pair.h:227:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::pair<_T1, _T2>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
from /usr/include/c++/5/bits/char_traits.h:39,
from /usr/include/c++/5/ios:40,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:304:5: note: candidate: template<class _Iterator> bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
operator!=(const reverse_iterator<_Iterator>& __x,
^
/usr/include/c++/5/bits/stl_iterator.h:304:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
from /usr/include/c++/5/bits/char_traits.h:39,
from /usr/include/c++/5/ios:40,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:354:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
operator!=(const reverse_iterator<_IteratorL>& __x,
^
/usr/include/c++/5/bits/stl_iterator.h:354:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::reverse_iterator<_Iterator>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
from /usr/include/c++/5/bits/char_traits.h:39,
from /usr/include/c++/5/ios:40,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:1077:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator!=(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
operator!=(const move_iterator<_IteratorL>& __x,
^
/usr/include/c++/5/bits/stl_iterator.h:1077:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::move_iterator<_Iterator>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
from /usr/include/c++/5/bits/char_traits.h:39,
from /usr/include/c++/5/ios:40,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:1083:5: note: candidate: template<class _Iterator> bool std::operator!=(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
operator!=(const move_iterator<_Iterator>& __x,
^
/usr/include/c++/5/bits/stl_iterator.h:1083:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::move_iterator<_Iterator>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/string:41:0,
from /usr/include/c++/5/bits/locale_classes.h:40,
from /usr/include/c++/5/bits/ios_base.h:41,
from /usr/include/c++/5/ios:42,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/allocator.h:140:5: note: candidate: template<class _T1, class _T2> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_T2>&)
operator!=(const allocator<_T1>&, const allocator<_T2>&)
^
/usr/include/c++/5/bits/allocator.h:140:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::allocator<_CharT>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/string:41:0,
from /usr/include/c++/5/bits/locale_classes.h:40,
from /usr/include/c++/5/bits/ios_base.h:41,
from /usr/include/c++/5/ios:42,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/allocator.h:146:5: note: candidate: template<class _Tp> bool std::operator!=(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
^
/usr/include/c++/5/bits/allocator.h:146:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::allocator<_CharT>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/string:52:0,
from /usr/include/c++/5/bits/locale_classes.h:40,
from /usr/include/c++/5/bits/ios_base.h:41,
from /usr/include/c++/5/ios:42,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/basic_string.h:4948:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/5/bits/basic_string.h:4948:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/string:52:0,
from /usr/include/c++/5/bits/locale_classes.h:40,
from /usr/include/c++/5/bits/ios_base.h:41,
from /usr/include/c++/5/ios:42,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/basic_string.h:4960:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator!=(const _CharT* __lhs,
^
/usr/include/c++/5/bits/basic_string.h:4960:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: mismatched types 'const _CharT*' and 'outside::MyAllocator<int>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/string:52:0,
from /usr/include/c++/5/bits/locale_classes.h:40,
from /usr/include/c++/5/bits/ios_base.h:41,
from /usr/include/c++/5/ios:42,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/basic_string.h:4972:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/5/bits/basic_string.h:4972:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/bits/ios_base.h:46:0,
from /usr/include/c++/5/ios:42,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/system_error:311:3: note: candidate: bool std::operator!=(const std::error_code&, const std::error_code&)
operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
^
/usr/include/c++/5/system_error:311:3: note: no known conversion for argument 1 from 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' to 'const std::error_code&'
/usr/include/c++/5/system_error:315:3: note: candidate: bool std::operator!=(const std::error_code&, const std::error_condition&)
operator!=(const error_code& __lhs, const error_condition& __rhs) noexcept
^
/usr/include/c++/5/system_error:315:3: note: no known conversion for argument 1 from 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' to 'const std::error_code&'
/usr/include/c++/5/system_error:319:3: note: candidate: bool std::operator!=(const std::error_condition&, const std::error_code&)
operator!=(const error_condition& __lhs, const error_code& __rhs) noexcept
^
/usr/include/c++/5/system_error:319:3: note: no known conversion for argument 1 from 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' to 'const std::error_condition&'
/usr/include/c++/5/system_error:323:3: note: candidate: bool std::operator!=(const std::error_condition&, const std::error_condition&)
operator!=(const error_condition& __lhs,
^
/usr/include/c++/5/system_error:323:3: note: no known conversion for argument 1 from 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' to 'const std::error_condition&'
In file included from /usr/include/c++/5/bits/locale_facets.h:48:0,
from /usr/include/c++/5/bits/basic_ios.h:37,
from /usr/include/c++/5/ios:44,
from /usr/include/c++/5/ostream:38,
from /usr/include/c++/5/iostream:39,
from prog.cpp:1:
/usr/include/c++/5/bits/streambuf_iterator.h:210:5: note: candidate: template<class _CharT, class _Traits> bool std::operator!=(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
^
/usr/include/c++/5/bits/streambuf_iterator.h:210:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/vector:64:0,
from prog.cpp:2:
/usr/include/c++/5/bits/stl_vector.h:1535:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator!=(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
operator!=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
^
/usr/include/c++/5/bits/stl_vector.h:1535:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::vector<_Tp, _Alloc>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/list:63:0,
from prog.cpp:3:
/usr/include/c++/5/bits/stl_list.h:291:5: note: candidate: template<class _Val> bool std::operator!=(const std::_List_iterator<_Tp>&, const std::_List_const_iterator<_Val>&)
operator!=(const _List_iterator<_Val>& __x,
^
/usr/include/c++/5/bits/stl_list.h:291:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::_List_iterator<_Tp>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
In file included from /usr/include/c++/5/list:63:0,
from prog.cpp:3:
/usr/include/c++/5/bits/stl_list.h:1843:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator!=(const std::list<_Tp, _Alloc>&, const std::list<_Tp, _Alloc>&)
operator!=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
^
/usr/include/c++/5/bits/stl_list.h:1843:5: note: template argument deduction/substitution failed:
In file included from /usr/include/c++/5/vector:69:0,
from prog.cpp:2:
/usr/include/c++/5/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::list<_Tp, _Alloc>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
I am trying to understand why this is the case and solution for this problem ?
The key part of the exception is hundreds of lines into it:
In file included from /usr/local/include/c++/5.2.0/vector:64:0,
from main.cpp:2: /usr/local/include/c++/5.2.0/bits/stl_vector.h:1535:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator!=(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
operator!=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
^
/usr/local/include/c++/5.2.0/bits/stl_vector.h:1535:5: note: template argument deduction/substitution failed:
In file included from /usr/local/include/c++/5.2.0/vector:69:0,
from main.cpp:2:
/usr/local/include/c++/5.2.0/bits/vector.tcc:176:37: note: 'std::_Vector_base<int, outside::MyAllocator<int> >::_Tp_alloc_type {aka outside::MyAllocator<int>}' is not derived from 'const std::vector<_Tp, _Alloc>'
&& _M_get_Tp_allocator() != __x._M_get_Tp_allocator())
^
vector::operator= requires vector::operator!=, which requires allocator::operator!=, which doesn't exist. Without it, the function can't be created. Simply add an operator!= to your allocator. While you're at it, also make sure you have all the other required allocator functions. If memory serves me right, you're missing a fair number.
Change the definition to struct MyAllocator: public std::allocator<T> and the code will compile.
I've been curious about why one error can cause the compiler to generate a very long list of error messages. The following example is the result of an erroneous comparison between an element of a vector<string> and NULL at line 100 of main.cpp under GCC 4.8.1:
> g++ -g3 -std=c++11 main.cpp functions.cpp
main.cpp: In function ‘int main()’:
main.cpp:100:24: error: no match for ‘operator==’ (operand types are ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ and ‘long int’)
if(args[1] == NULL) {
^
main.cpp:100:24: note: candidates are:
In file included from /usr/include/c++/4.8/iosfwd:40:0,
from /usr/include/c++/4.8/ios:38,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/postypes.h:216:5: note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
^
/usr/include/c++/4.8/bits/postypes.h:216:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::fpos<_StateT>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:64:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_pair.h:214:5: note: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
^
/usr/include/c++/4.8/bits/stl_pair.h:214:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::pair<_T1, _T2>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_iterator.h:291:5: note: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
operator==(const reverse_iterator<_Iterator>& __x,
^
/usr/include/c++/4.8/bits/stl_iterator.h:291:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_iterator.h:341:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
operator==(const reverse_iterator<_IteratorL>& __x,
^
/usr/include/c++/4.8/bits/stl_iterator.h:341:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_iterator.h:1031:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
operator==(const move_iterator<_IteratorL>& __x,
^
/usr/include/c++/4.8/bits/stl_iterator.h:1031:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::move_iterator<_Iterator>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_iterator.h:1037:5: note: template<class _Iterator> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
operator==(const move_iterator<_Iterator>& __x,
^
/usr/include/c++/4.8/bits/stl_iterator.h:1037:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::move_iterator<_Iterator>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/string:41:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/allocator.h:128:5: note: template<class _T1, class _T2> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
operator==(const allocator<_T1>&, const allocator<_T2>&)
^
/usr/include/c++/4.8/bits/allocator.h:128:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::allocator<_CharT>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/string:41:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/allocator.h:133:5: note: template<class _Tp> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
operator==(const allocator<_Tp>&, const allocator<_Tp>&)
^
/usr/include/c++/4.8/bits/allocator.h:133:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::allocator<_CharT>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/basic_string.h:2486:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2486:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: mismatched types ‘const std::basic_string<_CharT, _Traits, _Alloc>’ and ‘long int’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/basic_string.h:2493:5: note: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
operator==(const basic_string<_CharT>& __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2493:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: mismatched types ‘const std::basic_string<_CharT>’ and ‘long int’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/basic_string.h:2507:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator==(const _CharT* __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2507:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: mismatched types ‘const _CharT*’ and ‘std::basic_string<char>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/basic_string.h:2519:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/4.8/bits/basic_string.h:2519:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: mismatched types ‘const _CharT*’ and ‘long int’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/locale_facets.h:48:0,
from /usr/include/c++/4.8/bits/basic_ios.h:37,
from /usr/include/c++/4.8/ios:44,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/streambuf_iterator.h:204:5: note: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
^
/usr/include/c++/4.8/bits/streambuf_iterator.h:204:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::istreambuf_iterator<_CharT, _Traits>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/vector:64:0,
from main.h:16,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_vector.h:1403:5: note: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
^
/usr/include/c++/4.8/bits/stl_vector.h:1403:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::vector<_Tp, _Alloc>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/x86_64-suse-linux/bits/c++allocator.h:33:0,
from /usr/include/c++/4.8/bits/allocator.h:46,
from /usr/include/c++/4.8/string:41,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/ext/new_allocator.h:139:5: note: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
^
/usr/include/c++/4.8/ext/new_allocator.h:139:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const __gnu_cxx::new_allocator<_Tp>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_iterator.h:811:5: note: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
^
/usr/include/c++/4.8/bits/stl_iterator.h:811:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’
if(args[1] == NULL) {
^
In file included from /usr/include/c++/4.8/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8/bits/char_traits.h:39,
from /usr/include/c++/4.8/ios:40,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from main.h:13,
from main.cpp:12:
/usr/include/c++/4.8/bits/stl_iterator.h:805:5: note: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
^
/usr/include/c++/4.8/bits/stl_iterator.h:805:5: note: template argument deduction/substitution failed:
In file included from /usr/include/unistd.h:226:0,
from main.h:20,
from main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const __gnu_cxx::__normal_iterator<_IteratorL, _Container>’
if(args[1] == NULL) {
^
This can make it very hard to understand the problem. What is the reason for this behavior?
If you have an expression of the form vec == NULL, the compiler applies ADL to find an appropriate operator== to call. If it can't find a single one it outputs all operator== candidates found in all namespaces considered, and the reason they did not fit here.
One of those can look like this:
In file included from [..] main.cpp:12:
[..]:216:5: note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
^
[..]:216:5: note: template argument deduction/substitution failed:
In file included from [..] main.cpp:12:
main.cpp:100:27: note: ‘__gnu_cxx::__alloc_traits<std::allocator<std::basic_string<char> > >::value_type {aka std::basic_string<char>}’ is not derived from ‘const std::fpos<_StateT>’
if(args[1] == NULL) {
^
We couldn't match the first parameter to the first argument as std::string isn't derived from any fpos-specialization (also std::string doesn't have any appropriate conversion operators, but that isn't mentioned here). If you defined an operator== that can't be found/called, wouldn't you like to know the reason from the compilers view? (Especially if you don't have a clue yourself)
This can be very useful at times. When it isn't, ignore it. In most cases C++-programmers immediately see and understand what causes the error message (and its enourmos note-section).
This may help in situations like this (you got a large volume of template related message).
Whether your are using make or directly using the compiler, try to pipe the stderr to a file in my example
make 2> error.log
The use any editor open the error.log file. Search for file name of the source code you wrote. There should only be one or two lines that are interesting to you. For example:
mysourcefile.cpp:51:20: required from here
This is where the problem happened; look harder here.
temp_holder.clear();
temp_holder << n;
n_str = temp_holder.str();
int f = count(n_str.begin(), n_str.end(), a);
That's my code, and this is g++ output:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h: In instantiation of ‘typename std::iterator_traits<_InputIterator>::difference_type std::count(_IIter, _IIter, const _Tp&) [with _IIter = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; _Tp = std::basic_string<char>; typename std::iterator_traits<_InputIterator>::difference_type = long int]’:
trintatres.cpp:44:50: required from here
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: error: no match for ‘operator==’ in ‘__first.__gnu_cxx::__normal_iterator<_Iterator, _Container>::operator*<char*, std::basic_string<char> >() == __value’
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: candidates are:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iosfwd:42:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:39,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/postypes.h:218:5: note: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/postypes.h:218:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::fpos<_StateT>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:65:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/char_traits.h:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_pair.h:212:5: note: template<class _T1, class _T2> bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_pair.h:212:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::pair<_T1, _T2>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:68:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/char_traits.h:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:293:5: note: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:293:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::reverse_iterator<_Iterator>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:68:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/char_traits.h:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:343:5: note: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::reverse_iterator<_IteratorL>&, const std::reverse_iterator<_IteratorR>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:343:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::reverse_iterator<_IteratorL>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:43:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/allocator.h:119:5: note: template<class _T1, class _T2> bool std::operator==(const std::allocator<_T1>&, const std::allocator<_T2>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/allocator.h:119:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::allocator<_T1>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:43:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/allocator.h:124:5: note: template<class _Tp> bool std::operator==(const std::allocator<_Tp1>&, const std::allocator<_Tp1>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/allocator.h:124:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::allocator<_Tp1>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:54:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2483:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2483:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::basic_string<_CharT, _Traits, _Alloc>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:54:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2490:5: note: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2490:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::basic_string<_CharT>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:54:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2504:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2504:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const _CharT*’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:54:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2516:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_string.h:2516:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::basic_string<_CharT, _Traits, _Alloc>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_facets.h:50:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/basic_ios.h:39,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:45,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/streambuf_iterator.h:206:5: note: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/streambuf_iterator.h:206:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const std::istreambuf_iterator<_CharT, _Traits>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/x86_64-unknown-linux-gnu/bits/c++allocator.h:34:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/allocator.h:48,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/string:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/locale_classes.h:42,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/ios_base.h:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:43,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ext/new_allocator.h:129:5: note: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ext/new_allocator.h:129:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const __gnu_cxx::new_allocator<_Tp>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:68:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/char_traits.h:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:813:5: note: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:813:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’ and ‘char’
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algobase.h:68:0,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/char_traits.h:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ios:41,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/ostream:40,
from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/iostream:40,
from trintatres.cpp:1:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:807:5: note: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_iterator.h:807:5: note: template argument deduction/substitution failed:
In file included from /usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/algorithm:63:0,
from trintatres.cpp:5:
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/stl_algo.h:4656:2: note: mismatched types ‘const __gnu_cxx::__normal_iterator<_IteratorL, _Container>’ and ‘char’
I honestly think I'm using std::count from correctly, according to cplusplus.com.
Any idea of what I'm doing wrong?
EDIT
Full code:
#include <iostream>
#include <string>
#include <sstream>
#include <climits>
#include <algorithm>
using namespace std;
int max(int a, int b) {
return (a > b) ? a : b;
}
int main() {
string a;
cin >> a;
int c;
cin >> c;
int q;
cin >> q;
string cases[q];
int max_case = INT_MIN;
int temp;
for (int i = 0; i < q; i++) {
cin >> temp;
max_case = max(temp, max_case);
stringstream current_case_holder;
current_case_holder << temp;
cases[i] = current_case_holder.str();
}
int sequence[max_case];
int n;
stringstream temp_holder;
string n_str;
for (int i = 0; i < max_case; i++) {
n = 1;
while (true) {
temp_holder.clear();
temp_holder << n;
n_str = temp_holder.str();
int f = count(n_str.begin(), n_str.end(), a);
//}
n++;
}
}
return 0;
}
The first error tells you all you need to know:
In instantiation of ‘typename std::iterator_traits<_InputIterator>::difference_type std::count(_IIter, _IIter, const _Tp&)
[with _IIter = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >;
_Tp = std::basic_string<char>;
typename std::iterator_traits<_InputIterator>::difference_type = long int]’
This indicates that you're passing a std::string object for the third argument to std::count, which is wrong; you need to pass a char object instead, since you're effectively iterating over a std::string, and std::string::value_type is char.