Suspected std::array C++11 library is broken? What do I do? - c++

Question

From google I can't seem to find clear answers, But I don't know what to do. I suspected there might be a problem in a larger program I was writing with the array C++11 library for g++ and wrote a test program. I am using g++ 4.8.1.
main.cpp:
#include <iostream>
#include <array>
int main()
{
std::array<int,5> vector;
return 0;
}
My test command line compile is:
g++ main.cpp -std=c++11
with errors..
In file included from main.cpp:2:0:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:107:12: error: 'array' has not been declared
swap(array& __other)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array: In member function 'void std::Array<_Tp, _Nm>::swap(int&)':
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:109:50: error: request for member 'begin' in '__other', which is of non-class type 'int'
{ std::swap_ranges(begin(), end(), __other.begin()); }
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array: At global scope:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:228:22: error: 'array' does not name a type
operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:228:27: error: expected ',' or '...' before '<' token
operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:228:74: error: 'bool std::operator==(int)' must have an argument of class or enumerated type
operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:233:22: error: 'array' does not name a type
operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:233:27: error: expected ',' or '...' before '<' token
operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:233:74: error: 'bool std::operator!=(int)' must have an argument of class or enumerated type
operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:238:21: error: 'array' does not name a type
operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:238:26: error: expected ',' or '...' before '<' token
operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:238:69: error: 'bool std::operator<(int)' must have an argument of class or enumerated type
operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:246:21: error: 'array' does not name a type
operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:246:26: error: expected ',' or '...' before '<' token
operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:246:73: error: 'bool std::operator>(int)' must have an argument of class or enumerated type
operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:251:22: error: 'array' does not name a type
operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:251:27: error: expected ',' or '...' before '<' token
operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:251:74: error: 'bool std::operator<=(int)' must have an argument of class or enumerated type
operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:256:22: error: 'array' does not name a type
operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:256:27: error: expected ',' or '...' before '<' token
operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:256:74: error: 'bool std::operator>=(int)' must have an argument of class or enumerated type
operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:10: error: variable or field 'swap' declared void
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:10: error: 'array' was not declared in this scope
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:19: error: expected primary-expression before ',' token
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:27: error: '__one' was not declared in this scope
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:34: error: 'array' was not declared in this scope
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:43: error: expected primary-expression before ',' token
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:262:51: error: '__two' was not declared in this scope
swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two)
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:268:9: error: template declaration of 'constexpr _Tp& std::get'
get(array<_Tp, _Nm>& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:268:9: error: 'array' was not declared in this scope
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:268:18: error: expected primary-expression before ',' token
get(array<_Tp, _Nm>& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:268:26: error: '__arr' was not declared in this scope
get(array<_Tp, _Nm>& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:277:9: error: template declaration of 'constexpr _Tp&& std::get'
get(array<_Tp, _Nm>&& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:277:9: error: 'array' was not declared in this scope
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:277:18: error: expected primary-expression before ',' token
get(array<_Tp, _Nm>&& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:277:27: error: label '__arr' referenced outside of any function
get(array<_Tp, _Nm>&& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:277:27: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:285:15: error: 'array' does not name a type
get(const array<_Tp, _Nm>& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:285:20: error: expected ',' or '...' before '<' token
get(const array<_Tp, _Nm>& __arr) noexcept
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array: In function 'constexpr const _Tp& std::get(int)':
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:289:9: error: '__arr' was not declared in this scope
_S_ref(__arr._M_elems, _Int);
^
In file included from c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\iostream:38:0,
from main.cpp:1:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array: At global scope:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:306:23: error: 'array' is not a member of 'std'
struct tuple_size<_GLIBCXX_STD_C::array<_Tp, _Nm>>
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:306:23: error: 'array' is not a member of 'std'
In file included from main.cpp:2:0:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:306:50: error: wrong number of template arguments (2, should be 1)
struct tuple_size<_GLIBCXX_STD_C::array<_Tp, _Nm>>
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:303:11: error: provided for 'template<class _Tp> class std::tuple_size'
class tuple_size;
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:306:53: error: expected unqualified-id before '>' token
struct tuple_size<_GLIBCXX_STD_C::array<_Tp, _Nm>>
^
In file included from c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\iostream:38:0,
from main.cpp:1:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:314:32: error: 'array' is not a member of 'std'
struct tuple_element<_Int, _GLIBCXX_STD_C::array<_Tp, _Nm>>
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:314:32: error: 'array' is not a member of 'std'
In file included from main.cpp:2:0:
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:314:59: error: wrong number of template arguments (3, should be 2)
struct tuple_element<_Int, _GLIBCXX_STD_C::array<_Tp, _Nm>>
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:311:11: error: provided for 'template<unsigned int _Int, class _Tp> class std::tuple_element'
class tuple_element;
^
c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\array:314:62: error: expected unqualified-id before '>' token
struct tuple_element<_Int, _GLIBCXX_STD_C::array<_Tp, _Nm>>
^
main.cpp: In function 'int main()':
main.cpp:5:2: error: 'array' is not a member of 'std'
std::array<int,5> vector;
^
main.cpp:5:13: error: expected primary-expression before 'int'
std::array<int,5> vector;
^
main.cpp:5:13: error: expected ';' before 'int'
And clearly from the error, there is a lot of reference to the std::array file that i have included which seems to be the source of the error. What do I do?
Thanks in advance.
EDIT: added compilation commands and g++ version.

Answer 1

Turns out somehow a typo made its way into OP's <array>. What should have been
template<typename _Tp, std::size_t _Nm>
struct array
{
became
template<typename _Tp, std::size_t _Nm>
struct Array
{
Causing a bazillion compiler errors as it tries to process the rest of <array>.

Answer 2

This is a valid C++11 program.
The error you got is most probably due to dialect selection: the C++98 mode does not provide std::array container. See the docs at http://en.cppreference.com/w/cpp/container/array
Specifically, your error comes down to the following:
main.cpp: In function 'int main()':
main.cpp:5:2: error: 'array' is not a member of 'std'
std::array<int,5> vector;
^
main.cpp:5:13: error: expected primary-expression before 'int'
std::array<int,5> vector;
^
main.cpp:5:13: error: expected ';' before 'int'
So, just add -std=c++11 to the command line and things should work.

Answer 3

unable to reproduce with g++ 4.8.1 at Ideone:
the error messages are consistent with not providing option -std=c++11
add that option to the command line