I am trying to build this program:
#include "stdafx.h"
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/file_mapping.hpp>
#include <boost/interprocess/mapped_region.hpp>
using namespace std;
int main()
{
using boost::interprocess;
// Create the file mapping
file_mapping fm("input.dat", read_only);
// Map the file in memory
mapped_region region(fm, read_only);
// Get the address where the file has been mapped
float * addr = (float *)region.get_address();
std::size_t elements = region.get_size() / sizeof(float);
}
But I am having two problems, for the main I am getting:
1>tasker.cpp(98): error C2873: 'boost::interprocess' : symbol cannot be used in a using-declaration
1>tasker.cpp(101): error C2065: 'file_mapping' : undeclared identifier
1>tasker.cpp(101): error C2146: syntax error : missing ';' before identifier 'fm'
1>tasker.cpp(101): error C2065: 'read_only' : undeclared identifier
1>tasker.cpp(101): error C3861: 'fm': identifier not found
1>tasker.cpp(103): error C2065: 'mapped_region' : undeclared identifier
1>tasker.cpp(103): error C2146: syntax error : missing ';' before identifier 'region'
1>tasker.cpp(103): error C2065: 'fm' : undeclared identifier
1>tasker.cpp(103): error C2065: 'read_only' : undeclared identifier
1>tasker.cpp(103): error C3861: 'region': identifier not found
1>tasker.cpp(105): error C2065: 'region' : undeclared identifier
1>tasker.cpp(105): error C2228: left of '.get_address' must have class/struct/union
1> type is 'unknown-type'
1>tasker.cpp(106): error C2065: 'region' : undeclared identifier
1>tasker.cpp(106): error C2228: left of '.get_size' must have class/struct/union
1> type is 'unknown-type'
and for the #include <boost/interprocess/mapped_region.hpp> I am getting
1>C:\Users\Mike\Documents\boost_1_55_0\boost/intrusive/detail/has_member_function_callable_with.hpp(200): error C2228: left of '.select_on_container_copy_construction' must have class/struct/union
1> type is 'boost::move_detail::add_rvalue_reference<U>::type'
1> C:\Users\Mike\Documents\boost_1_55_0\boost/intrusive/detail/has_member_function_callable_with.hpp(276) : see reference to class template instantiation 'boost::container::container_detail::has_member_function_callable_with_select_on_container_copy_construction_impl<Fun,true,>' being compiled
1> with
1> [
1> Fun=std::allocator<std::pair<const boost::interprocess::ipcdetail::sync_id *const ,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>>>
1> ]
1> C:\Users\Mike\Documents\boost_1_55_0\boost/container/allocator_traits.hpp(262) : see reference to class template instantiation 'boost::container::container_detail::has_member_function_callable_with_select_on_container_copy_construction<const Alloc,>' being compiled
1> with
1> [
1> Alloc=std::allocator<std::pair<const boost::interprocess::ipcdetail::sync_id *const ,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>>>
1> ]
1> C:\Users\Mike\Documents\boost_1_55_0\boost/container/detail/tree.hpp(217) : see reference to class template instantiation 'boost::container::allocator_traits<A>' being compiled
1> with
1> [
1> A=std::allocator<std::pair<const boost::interprocess::ipcdetail::sync_id *const ,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>>>
1> ]
1> C:\Users\Mike\Documents\boost_1_55_0\boost/container/detail/tree.hpp(246) : see reference to class template instantiation 'boost::container::container_detail::intrusive_rbtree_type<A,boost::container::container_detail::tree_value_compare<Key,std::pair<const Key,T>,Compare,boost::container::container_detail::select1st<std::pair<const Key,T>>>>' being compiled
1> with
1> [
1> A=std::allocator<std::pair<const boost::interprocess::ipcdetail::sync_id *const ,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>>>
1> , Key=const boost::interprocess::ipcdetail::sync_id *
1> , T=boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>
1> , Compare=boost::interprocess::ipcdetail::sync_handles::address_less
1> ]
1> C:\Users\Mike\Documents\boost_1_55_0\boost/container/map.hpp(83) : see reference to class template instantiation 'boost::container::container_detail::rbtree<Key,std::pair<const Key,T>,boost::container::container_detail::select1st<std::pair<const Key,T>>,Compare,Allocator>' being compiled
1> with
1> [
1> Key=const boost::interprocess::ipcdetail::sync_id *
1> , T=boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>
1> , Compare=boost::interprocess::ipcdetail::sync_handles::address_less
1> , Allocator=std::allocator<std::pair<const boost::interprocess::ipcdetail::sync_id *const ,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<std::pair<const boost::interprocess::ipcdetail::sync_id,void *>>>>>
1> ]
1> C:\Users\Mike\Documents\boost_1_55_0\boost/interprocess/sync/windows/sync_utils.hpp(226) : see reference to class template instantiation 'boost::container::map<const boost::interprocess::ipcdetail::sync_id *,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<T>>,boost::interprocess::ipcdetail::sync_handles::address_less,std::allocator<std::pair<const Key,boost::unordered::iterator_detail::iterator<boost::unordered::detail::ptr_node<T>>>>>' being compiled
1> with
1> [
1> T=std::pair<const boost::interprocess::ipcdetail::sync_id,void *>
1> , Key=const boost::interprocess::ipcdetail::sync_id *
1> ]
I am using Visual Studio Express 2013 for Windows Desktop, and boost 1.55.0.
I tried other boost libraries and work without any issue.... Also, I am using the x64 release build.
Boost 1.55 does not fully supports Visual Studio 2013 compiler yet.
Either:
use Visual Studio 2012 toolchain
or try to get latest source from svn co http://svn.boost.org/svn/boost/trunk boost-trunk
or patch boost yourself (don't forget to upload your patch)
or wait until someone will patch it. You can speed it up by submitting bug report
Edit
Just checked boost-trunk, with boost/intrusive/detail/has_member_function_callable_with.hpp already patched and it compiles fine with both vs2013 and vs2013-nov-2013-ctp toolchains. So, try it. And, if you have multiple boost versions, don't forget to change include paths (in Makefile or VC project properties) as I did. ;)
Note, that, obviously, latest development code can be unstable. Do not use it for end-user production.
Try changing this:
using boost::interprocess;
to this:
using namespace boost::interprocess;
(Ref: Example in http://www.boost.org/doc/libs/1_55_0/doc/html/interprocess/quick_guide.html )
Yeah. you need to say "using namespace boost::interprocess;"
Fix that and you should be good.
Related
typedef vector<string> tdv_Str;
typedef map<string, tdv_Str, CaseI> tdm_StrList; // var name, possible values
typedef map<short, tdm_StrList> tdm_VarList; // type, var list
*CaseI is string map sorting with case insensitive.
When I check if the key of tdm_VarList (list) is existing or not:
if (list.count(key) == 0)
// ...
then compiled it, I got the following error:
1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(1089): error C2220: warning treated as error - no 'object' file generated
1> c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\map(81) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled
1> with
1> [
1> _Traits=std::_Tmap_traits<short,tdm_StrList,std::less<short>,std::allocator<std::pair<const short,tdm_StrList>>,false>
1> ]
1> Src\APS.cpp(683) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1> with
1> [
1> _Kty=short,
1> _Ty=tdm_StrList
1> ]
1>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(1089): warning C4503: 'std::_Tree<_Traits>::_Insert' : decorated name length exceeded, name was truncated
1> with
1> [
1> _Traits=std::_Tmap_traits<short,tdm_StrList,std::less<short>,std::allocator<std::pair<const short,tdm_StrList>>,false>
1> ]
You elevated a warning ("decorated name length exceeded") to an error.
In other words, the internal name for the complex type you define has become longer than 4096 characters.
The corresponding MS documentation for the warning message explains the problem inmore detail and suggests work-araounds.
I need to use matricies for a program I am writing, so I downloaded and installed Eigen, however, upon compiling my project my error log is absolutely flooded with errors, all of which seem to be coming from the Eigen files themselves, here is my error log:
1>------ Build started: Project: ailib, Configuration: Debug Win32 ------
1> NeuralNet.cpp
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(52): error C2039: 'ReturnType': is not a member of 'Eigen::internal::scalar_product_traits<LhsScalar,RhsScalar>'
1> with
1> [
1> LhsScalar=float,
1> RhsScalar=Eigen::internal::result_of<Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT> (float,float)>::type
1> ]
1> c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\util\meta.h(161): note: see reference to class template instantiation 'Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<BinaryOp (float,float)>::type>' being compiled
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>
1> ]
1> c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\cwisebinaryop.h(58): note: see reference to class template instantiation 'Eigen::internal::result_of<BinaryOp (float,bool)>' being compiled
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT> (float,float)>::type>
1> ]
1> c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\cwisebinaryop.h(165): note: see reference to class template instantiation 'Eigen::internal::traits<Derived>' being compiled
1> with
1> [
1> Derived=Eigen::CwiseBinaryOp<Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT> (float,float)>::type>,const Eigen::ArrayWrapper<Eigen::Matrix<float,-1,1,0,-1,1>>,const Eigen::CwiseBinaryOp<Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>,const Eigen::CwiseNullaryOp<Eigen::internal::scalar_constant_op<float>,Eigen::Array<float,-1,1,0,-1,1>>,const Eigen::ArrayWrapper<Eigen::Matrix<float,-1,1,0,-1,1>>>>
1> ]
1> c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\cwisebinaryop.h(112): note: see reference to class template instantiation 'Eigen::CwiseBinaryOpImpl<BinaryOp,Lhs,Rhs,Eigen::Dense>' being compiled
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT> (float,float)>::type>,
1> Lhs=Eigen::ArrayWrapper<Eigen::Matrix<float,-1,1,0,-1,1>>,
1> Rhs=Eigen::CwiseBinaryOp<Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>,const Eigen::CwiseNullaryOp<Eigen::internal::scalar_constant_op<float>,Eigen::Array<float,-1,1,0,-1,1>>,const Eigen::ArrayWrapper<Eigen::Matrix<float,-1,1,0,-1,1>>>
1> ]
1> c:\users\rick simone\documents\aioli\ailib\ailib\neuralnet.cpp(51): note: see reference to class template instantiation 'Eigen::CwiseBinaryOp<Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<BinaryOp (float,float)>::type>,const Derived,const Eigen::CwiseBinaryOp<BinaryOp,const Eigen::CwiseNullaryOp<Eigen::internal::scalar_constant_op<float>,Eigen::Array<float,-1,1,0,-1,1>>,const Derived>>' being compiled
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>,
1> Derived=Eigen::ArrayWrapper<Eigen::Matrix<float,-1,1,0,-1,1>>
1> ]
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(52): error C3646: 'result_type': unknown override specifier
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(52): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(54): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(54): error C2143: syntax error: missing ';' before '('
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(54): error C2433: 'Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<BinaryOp (float,float)>::type>::result_type': '__forceinline' not permitted on data declarations
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>
1> ]
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(59): error C2327: 'Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<BinaryOp (float,float)>::type>::result_type': is not a type name, static, or enumerator
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>
1> ]
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(59): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(59): error C2433: 'result_type': '__forceinline' not permitted on data declarations
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(59): error C2365: 'Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<BinaryOp (float,float)>::type>::result_type': redefinition; previous definition was 'data member'
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>
1> ]
1> c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(54): note: see declaration of 'Eigen::internal::scalar_product_op<float,Eigen::internal::result_of<BinaryOp (float,float)>::type>::result_type'
1> with
1> [
1> BinaryOp=Eigen::internal::scalar_cmp_op<float,Eigen::internal::cmp_LT>
1> ]
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(59): error C2061: syntax error: identifier 'predux'
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(61): error C2143: syntax error: missing ';' before '}'
1>c:\users\rick simone\documents\aioli\ailib\eigen\eigen\src\core\functors.h(61): error C2238: unexpected token(s) preceding ';'
The problem is, when I go to the files and lines indicated by the errors, they are in the Eigen source code (Which I haven't modified or touched), the snippet where all the errors come from is as follows:
template<typename LhsScalar,typename RhsScalar> struct scalar_product_op {
enum {
// TODO vectorize mixed product
Vectorizable = is_same<LhsScalar,RhsScalar>::value && packet_traits<LhsScalar>::HasMul && packet_traits<RhsScalar>::HasMul
};
typedef typename scalar_product_traits<LhsScalar,RhsScalar>::ReturnType result_type;
EIGEN_EMPTY_STRUCT_CTOR(scalar_product_op)
EIGEN_STRONG_INLINE const result_type operator() (const LhsScalar& a, const RhsScalar& b) const { return a * b; }
template<typename Packet>
EIGEN_STRONG_INLINE const Packet packetOp(const Packet& a, const Packet& b) const
{ return internal::pmul(a,b); }
template<typename Packet>
EIGEN_STRONG_INLINE const result_type predux(const Packet& a) const
{ return internal::predux_mul(a); }
};
Includes used:
#include <Eigen\Core>
#include <Eigen\Dense>
Line 51 NeuralNet.cpp: err = errIn.array() * (m_layerOut.array() > 0.f);
Types of Variables: err, errIn and m_layerOut are all Eigen::Matrix<float, Eigen::Dynamic, 1>
Thanks in advance!
As posted, your question is very hard to answer. There are a bunch of errors in template code which is determined by your usage at compile time. For future reference, it would make it much easier on both you and those attempting to answer if you tried to boil it down to a MCVE (also worth reading, How do I ask a good question?).
So, after reading the above links, you would rephrase your question to read something like:
I've wrote some code that produces a bunch of errors and I can't figure out why. Here is the minimal code that I've managed to create that reproduces this problem:
#include "Eigen/Core"
#include <iostream>
int main()
{
size_t sz = 64;
Eigen::Matrix<float, Eigen::Dynamic, 1> err, errIn, m_layerOut;
errIn.setRandom(sz);
m_layerOut.setRandom(sz);
err = errIn.array() * (m_layerOut.array() > 0.f);
std::cout << err;
return 0;
}
I tried to compile using g++ on MinGW (version 9.187 beta, 256bit) using g++ SO.cpp -I .. I have the same issues when using VS2048 using .
The errors I get are all related to the Eigen library (v3.9.6), which I know to be bug free (they're all features):
1>....\eigen\src/Core/Functors.h(52): error C2039: 'ReturnType' : is not a member of 'Eigen::internal::scalar_product_traits'
1> with
1> [
1> LhsScalar=float
1> , RhsScalar=Eigen::internal::result_of (float,float)>::type
1> ]
1> ....\eigen\src/Core/util/Meta.h(161) : see reference to class template instantiation 'Eigen::internal::scalar_product_op::type>' being compiled
1> with
1> [...
What is causing these compilation errors?
The average SO user could then copy your example directly into the ancient VS2017 IDE hit F7 and reproduce the errors. He would then realize that the expression
errIn.array() * (m_layerOut.array() > 0.f)
is the coefficient-wise product of a float and a bool, something that Eigen didn't support (in those days) without an explicit cast. He would then write up a quick answer saying:
You have to explicitly cast the comparison array from a boolean array to a float array like this:
err = errIn.array() * (m_layerOut.array() > 0.f).cast<float>();
You would then accept that answer, as it solved your problem, and move on.
I have a Visual Studio 2008 c++ project that uses a COM object like this:
ISomeComInterface* foo;
HANDLE file = foo->CreateFile();
// file operations...
foo->CloseHandle( file );
I would like to use boost::shared_ptr<> to encapsulate the lifetime management of the returned HANDLE object. e.g:
ISomeComInterface* foo;
boost::shared_ptr< void > file( foo->CreateFile(),
boost::bind( &ISomeComInterface::CloseHandle, foo, _1 ) );
// file operations...
Unfortunately, this doesn't compile:
1>Compiling...
1>Audit Tool.cpp
1>boost\bind\bind.hpp(69) : error C2825: 'F': must be a class or namespace when followed by '::'
1> boost\bind\bind_template.hpp(15) : see reference to class template instantiation 'boost::_bi::result_traits<R,F>' being compiled
1> with
1> [
1> R=boost::_bi::unspecified,
1> F=int (__stdcall ISomeComInterface::* )(HANDLE)
1> ]
1> Myapp.hpp(78) : see reference to class template instantiation 'boost::_bi::bind_t<R,F,L>' being compiled
1> with
1> [
1> R=boost::_bi::unspecified,
1> F=BOOL (__stdcall ISomeComInterface::* )(HANDLE),
1> L=boost::_bi::list2<boost::_bi::value<ISomeComInterface *>,boost::arg<1>>
1> ]
1>boost\bind\bind.hpp(69) : error C2039: 'result_type' : is not a member of '`global namespace''
1>boost\bind\bind.hpp(69) : error C2146: syntax error : missing ';' before identifier 'type'
1>boost\bind\bind.hpp(69) : error C2208: 'boost::_bi::type' : no members defined using this type
1>boost\bind\bind.hpp(69) : fatal error C1903: unable to recover from previous error(s); stopping compilation
What can I do to get the functionality I'm looking for?
Thanks,
PaulH
Eric answered the question
#define BOOST_MEM_FN_ENABLE_STDCALL
htttp://www.boost.org/doc/libs/1_45_0/libs/bind/bind.html#Q_com
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 10 years ago.
#include <iostream>
#include <cmath>
#include <vector>
using namespace std;
int square(int a){
return a*a;
}
struct Point{
int x,y;
};
int distance (const Point& a,const Point& b){
int k=(int) sqrt((float)((a.x-b.x)*(a.x-b.x))+((a.y-b.y)*(a.y-b.y)));
return k;
}
int main(){
vector<Point>a(10);
for (int i=0;i<10;i++){
cin>>a[i].x>>a[i].y;
}
int s=0;
int s1;
int k=0;
for (int i=1;i<10;i++){
s+=square(distance(a[0],a[i]));
}
for (int i=1;i<10;i++){
s1=0;
for (int j=0;j<10;j++){
s1+=square(distance(a[i],a[j]));
if (s1<s) { s=s1; k=i;}
}
}
cout<<k<<"Points are:";
cout<<a[k].x;
cout<<a[k].y;
return 0;
}
i have following code but here is list of errors
1>------ Build started: Project: distance, Configuration: Debug Win32 ------
1> distance.cpp
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2039: 'iterator_category' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(30) : see reference to class template instantiation 'std::iterator_traits<_Iter>' being compiled
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2146: syntax error : missing ';' before identifier 'iterator_category'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2602: 'std::iterator_traits<_Iter>::iterator_category' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(373) : see declaration of 'std::iterator_traits<_Iter>::iterator_category'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2868: 'std::iterator_traits<_Iter>::iterator_category' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2039: 'value_type' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2146: syntax error : missing ';' before identifier 'value_type'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2602: 'std::iterator_traits<_Iter>::value_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(374) : see declaration of 'std::iterator_traits<_Iter>::value_type'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2868: 'std::iterator_traits<_Iter>::value_type' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2039: 'difference_type' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2146: syntax error : missing ';' before identifier 'difference_type'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2602: 'std::iterator_traits<_Iter>::difference_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(375) : see declaration of 'std::iterator_traits<_Iter>::difference_type'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2868: 'std::iterator_traits<_Iter>::difference_type' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2039: 'pointer' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2146: syntax error : missing ';' before identifier 'pointer'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2602: 'std::iterator_traits<_Iter>::pointer' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(377) : see declaration of 'std::iterator_traits<_Iter>::pointer'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2868: 'std::iterator_traits<_Iter>::pointer' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2039: 'reference' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2146: syntax error : missing ';' before identifier 'reference'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2602: 'std::iterator_traits<_Iter>::reference' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(378) : see declaration of 'std::iterator_traits<_Iter>::reference'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2868: 'std::iterator_traits<_Iter>::reference' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
This is caused in part by your use of using namespace std;.
There is a function in the standard library, std::distance, that is used to compute the distance between two iterators into a container. That function is being selected during overload resolution instead of your distance function.
If you don't use using namespace std;, you won't have this problem. Your use of using namespace std; brings all of the names from the std namespace into the global namespace. This is bad because there are a lot of common names in namespace std and it can cause convoluted issues during name lookup, as you've discovered here.
In general, prefer not to use using namespace, especially not at file scope. It's far easier and clearer in the long run to qualify each of the names that you want to use.
#James is right in that getting rid of using namespace std will make this problem go away. But that's not exactly what the actual problem is.
The problem comes from the way names are resolved in C++. C++ uses a very aggressive approach to resolving name lookups when resolving the names of free functions if no suitable class member was found. This is called Argument-dependent name lookup (or ADL), sometimes referred to as Koenig lookup. And at the same time, it is one of the things makes C++ so powerful, but also so deadly and confounding.
Here's the basic problem, simplified.
You call vector::operator[] which returns a vector::reference or a vector::const_reference. You take this return value and call distance() unqualified.
Because distance wasn't found in and applicable class, ADL kicks in, which goes out and gets too many potential matching names.
ADL then goes through the list of candidates and picks "the best match". In this case, the reference that operator[] returns is a closer match to the type expected by std::distance than by your distance, although both are compatible, so std::distance is selected.
Several ways to solve this problem:
Don't using namespace std. Instead, using just the peices you want.
Quantify explicitly which distance you refer to using the scope resolution operator: ::distance()
Change distance to take pointers instead of const &. This effectively turns off ADL.:
Example:
int distance(const Point* a,const Point* b)
s+=square(distance(&a[0],&a[1]));
Additional Resources:
"A Modest Proposal: Fixing ADL (revision 2)" by Herb Sutter
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i have following code
#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <string.h>
#include <hash_map>
#include <string>
#include <iterator>
#include <ostream>
using namespace std;
struct Equal
{
bool operator()(const char *s1,const char *s2)const
{
return std::strcmp(s1,s2)==0;
}
};
typedef std::hash_multimap<const char*,int,hash<const char*>,Equal>map_type;
void lookup(const map_type&Map,const char *str){
cout<<str<<":";
pair<map_type::const_iterator ,map_type::const_iterator>p=Map.equal_range(str);
for (map_type::const_iterator i=p.first;i!=p.second;++i)
cout << (*i).second<<" ";
}
int maain(){
map_type m;
m.insert(map_type::value_type("H", 1));
m.insert(map_type::value_type("H", 2));
m.insert(map_type::value_type("C", 12));
m.insert(map_type::value_type("C", 13));
m.insert(map_type::value_type("O", 16));
m.insert(map_type::value_type("O", 17));
m.insert(map_type::value_type("O", 18));
m.insert(map_type::value_type("I", 127));
lookup(M,"I");
lookup(M,"0");
lookup(M,"Rn");
return 0;
}
but here is errors
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2903: 'rebind' : symbol is neither a class template nor a function template
1> c:\program files\microsoft visual studio 10.0\vc\include\xhash(170) : see reference to class template instantiation 'std::_Hmap_traits<_Kty,_Ty,_Tr,_Alloc,_Mfl>' being compiled
1> with
1> [
1> _Kty=const char *,
1> _Ty=int,
1> _Tr=std::hash<const char *>,
1> _Alloc=Equal,
1> _Mfl=true
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\hash_map(273) : see reference to class template instantiation 'std::_Hash<_Traits>' being compiled
1> with
1> [
1> _Traits=std::_Hmap_traits<const char *,int,std::hash<const char *>,Equal,true>
1> ]
1> c:\users\7\documents\visual studio 2010\projects\hash_tables\hash_tables\hash_tables.cpp(22) : see reference to class template instantiation 'stdext::hash_multimap<_Kty,_Ty,_Tr,_Alloc>' being compiled
1> with
1> [
1> _Kty=const char *,
1> _Ty=int,
1> _Tr=std::hash<const char *>,
1> _Alloc=Equal
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2039: 'rebind' : is not a member of 'Equal'
1> c:\users\7\documents\visual studio 2010\projects\hash_tables\hash_tables\hash_tables.cpp(11) : see declaration of 'Equal'
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2143: syntax error : missing ';' before '<'
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2039: 'other' : is not a member of '`global namespace''
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(27): error C2238: unexpected token(s) preceding ';'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(180): error C2039: 'bucket_size' : is not a member of 'std::hash<_Kty>'
1> with
1> [
1> _Kty=const char *
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(180): error C2065: 'bucket_size' : undeclared identifier
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(184): error C2039: 'allocator_type' : is not a member of 'std::_Hmap_traits<_Kty,_Ty,_Tr,_Alloc,_Mfl>'
1> with
1> [
1> _Kty=const char *,
1> _Ty=int,
1> _Tr=std::hash<const char *>,
1> _Alloc=Equal,
1> _Mfl=true
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(184): error C2146: syntax error : missing ',' before identifier 'allocator_type'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(184): error C2065: 'allocator_type' : undeclared identifier
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(186): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(187): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(188): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(189): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(190): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(191): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(192): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(193): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(197): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2146: syntax error : missing ';' before identifier 'iterator'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C3254: 'std::_Hash<_Traits>' : class contains explicit override 'type' but does not derive from an interface that contains the function declaration
1> with
1> [
1> _Traits=std::_Hmap_traits<const char *,int,std::hash<const char *>,Equal,true>
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2838: 'type' : illegal qualified name in member declaration
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2208: 'std::iterator' : no members defined using this type
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): fatal error C1903: unable to recover from previous error(s); stopping compilation
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:01.96
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
please help
You have to look at each complier error and fix them one at a time. We can't take a file of code and fix each error. Learning to live and even on occasion love the abusive spouse that is your complier is part of the process.
All your errors seem related to the fact that you're not passing the right template arguments to hash_multimap. Take a look at hash_multimap's documentation. The last parameter, Èqual` should be the allocator, not a function object, check out the 1st error:
c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2903: 'rebind' : symbol is neither a class template nor a function template
c:\program files\microsoft visual studio 10.0\vc\include\xhash(170) : see reference to class template instantiation 'std::_Hmap_traits<_Kty,_Ty,_Tr,_Alloc,_Mfl>' being compiled
with
[
_Kty=const char *,
_Ty=int,
_Tr=std::hash,
_Alloc=Equal,
_Mfl=true
]
Edit:
If you've looked at SGI's hash_multimap documentation, you'll notice that the hash_map and hash_multimap classes are different between vendors because they are not standard. The next version of the standard comprises standard hashed containers. In the mean time, well, you'll have to write non portable code!