visual-studio-2010 - std::make_pair 的这种使用在 GCC 3 和 4 中运行良好。它在 Visual Studio C++ 2010 中失败。为什么？

Question

这在 GCC 3 和 4 中编译得很好。MSVC++ 无法确定 noFunction 的类型并抛出一些可怕的错误。请注意，如果您将 noFunction 转换为 BFunction，它在 VS2010 中工作得很好。

我的问题:这是 VS2010 中的缺陷，还是 GCC 违反规则？

#include <map>

using namespace std;

typedef bool (*AFunction)(int arg1, int arg2);
typedef bool (*BFunction)(long arg1, bool arg2);

bool noFunction(long, bool) { return true; }

void test(AFunction a)
{

    make_pair(a, noFunction); //fails in VS2010

}

注:将 noFunction 转换为 BFunction 解决了 VS2010 中的问题。

make_pair(a, (BFunction)noFunction);  //works everywhere

.

.

.

以下是错误供引用:

    1>  makepairtest.cpp
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\type_traits(197): error C2752: 'std::tr1::_Remove_reference<_Ty>' : more than one partial specialization matches the template argument list
1>          with
1>          [
1>              _Ty=bool (__cdecl &)(long,bool)
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtr1common(356): could be 'std::tr1::_Remove_reference<_Ty&&>'
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtr1common(350): or       'std::tr1::_Remove_reference<_Ty&>'
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\type_traits(962) : see reference to class template instantiation 'std::tr1::remove_reference<_Ty>' being compiled
1>          with
1>          [
1>              _Ty=bool (__cdecl &)(long,bool)
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(26) : see reference to class template instantiation 'std::tr1::decay<_Ty>' being compiled
1>          with
1>          [
1>              _Ty=bool (__cdecl &)(long,bool)
1>          ]
1>          c:\xxx\makepairtest.cpp(14) : see reference to class template instantiation 'std::tr1::_Unrefwrap<_Type>' being compiled
1>          with
1>          [
1>              _Type=bool (__cdecl &)(long,bool)
1>          ]
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\type_traits(965): error C2528: 'abstract declarator' : pointer to reference is illegal
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\type_traits(349): error C2528: 'type' : pointer to reference is illegal
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\type_traits(967) : see reference to class template instantiation 'std::tr1::add_pointer<_Ty>' being compiled
1>          with
1>          [
1>              _Ty=bool (__cdecl &)(long,bool)
1>          ]
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(148): error C2535: 'std::_Pair_base<_Ty1,_Ty2>::_Pair_base(const _Ty1 &,const _Ty2)' : member function already defined or declared
1>          with
1>          [
1>              _Ty1=bool (__cdecl *)(int,int),
1>              _Ty2=bool (__cdecl &)(long,bool)
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(134) : see declaration of 'std::_Pair_base<_Ty1,_Ty2>::_Pair_base'
1>          with
1>          [
1>              _Ty1=bool (__cdecl *)(int,int),
1>              _Ty2=bool (__cdecl &)(long,bool)
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(174) : see reference to class template instantiation 'std::_Pair_base<_Ty1,_Ty2>' being compiled
1>          with
1>          [
1>              _Ty1=bool (__cdecl *)(int,int),
1>              _Ty2=bool (__cdecl &)(long,bool)
1>          ]
1>          c:\xxx\makepairtest.cpp(14) : see reference to class template instantiation 'std::pair<_Ty1,_Ty2>' being compiled
1>          with
1>          [
1>              _Ty1=bool (__cdecl *)(int,int),
1>              _Ty2=bool (__cdecl &)(long,bool)
1>          ]

Answer 1

取地址noFunction适用于 VC10 和 gcc 4.5.2，即:

make_pair(a, &noFunction);

根据您发布的错误消息，我猜这与 VC 如何处理绑定(bind)到右值有关。