マップ - それを

Question

を行うにはどのように私は次のコードを持っている：

std::map<std::wstring, std::vector<Table> > my_map; 
my_map[L"abc"].push_back(Table()); 

が、それをコンパイルしようとしているが、それは私が全く理解していないこれは、エラー{MSVC 2010}の多くを提供します。

したがって、修辞的な質問の1つ：なぜMSは人々が理解できないエラーの束を与えているのですか？そして2番目：2行目の修正方法は？

ありがとうございます。ここで

は、参考のためにエラーです：

2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::vector<_Ty,_Ax> &,const std::vector<_Ty,_Ax> &)' : could not deduce template argument for 'const std::vector<_Ty,_Ax> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\vector(1502) : see declaration of 'std::operator <' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(124) : while compiling class template member function 'bool std::less<_Ty>::operator()(const _Ty &,const _Ty &) const' 
2>   with 
2>   [ 
2>    _Ty=std::wstring 
2>   ] 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\map(71) : see reference to class template instantiation 'std::less<_Ty>' being compiled 
2>   with 
2>   [ 
2>    _Ty=std::wstring 
2>   ] 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(451) : see reference to class template instantiation 'std::_Tmap_traits<_Kty,_Ty,_Pr,_Alloc,_Mfl>' being compiled 
2>   with 
2>   [ 
2>    _Kty=std::wstring, 
2>    _Ty=std::vector<Table>, 
2>    _Pr=std::less<std::wstring>, 
2>    _Alloc=std::allocator<std::pair<const std::wstring,std::vector<Table>>>, 
2>    _Mfl=false 
2>   ] 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(520) : see reference to class template instantiation 'std::_Tree_nod<_Traits>' being compiled 
2>   with 
2>   [ 
2>    _Traits=std::_Tmap_traits<std::wstring,std::vector<Table>,std::less<std::wstring>,std::allocator<std::pair<const std::wstring,std::vector<Table>>>,false> 
2>   ] 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(659) : see reference to class template instantiation 'std::_Tree_val<_Traits>' being compiled 
2>   with 
2>   [ 
2>    _Traits=std::_Tmap_traits<std::wstring,std::vector<Table>,std::less<std::wstring>,std::allocator<std::pair<const std::wstring,std::vector<Table>>>,false> 
2>   ] 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\map(81) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled 
2>   with 
2>   [ 
2>    _Traits=std::_Tmap_traits<std::wstring,std::vector<Table>,std::less<std::wstring>,std::allocator<std::pair<const std::wstring,std::vector<Table>>>,false> 
2>   ] 
2>   C:\Users\Igor\OneDrive\Documents\dbhandler_app\dbinterface\database.h(115) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled 
2>   with 
2>   [ 
2>    _Kty=std::wstring, 
2>    _Ty=std::vector<Table> 
2>   ] 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::vector<_Ty,_Ax> &,const std::vector<_Ty,_Ax> &)' : could not deduce template argument for 'const std::vector<_Ty,_Ax> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\vector(1502) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::vector<_Ty,_Ax> &,const std::vector<_Ty,_Ax> &)' : could not deduce template argument for 'const std::vector<_Ty,_Ax> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\vector(1502) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(1885) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(1885) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xtree(1885) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::unique_ptr<_Ty,_Dx> &,const std::unique_ptr<_Ty2,_Dx2> &)' : could not deduce template argument for 'const std::unique_ptr<_Ty,_Dx> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\memory(2582) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::unique_ptr<_Ty,_Dx> &,const std::unique_ptr<_Ty2,_Dx2> &)' : could not deduce template argument for 'const std::unique_ptr<_Ty,_Dx> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\memory(2582) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::unique_ptr<_Ty,_Dx> &,const std::unique_ptr<_Ty2,_Dx2> &)' : could not deduce template argument for 'const std::unique_ptr<_Ty,_Dx> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\memory(2582) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(1356) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(1356) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(1356) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(1179) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(1179) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xutility(1179) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\utility(318) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\utility(318) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::wstring' 
2>   c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\utility(318) : see declaration of 'std::operator <' 
2>c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xfunctional(125): error C2676: binary '<' : 'const std::wstring' does not define this operator or a conversion to a type acceptable to the predefined operator 

Answer 1

傷のあごフム。このエラーメッセージは疑わしい：

2> C：\プログラムファイルのMicrosoftのVisual Studio \（x86の） 10.0 \ VC \には、\ xfunctional（125）：エラーC2676：バイナリ '<'：「constのSTD： ：wstringのは、」事前に定義されたオペレータに許容可能なこの演算子やタイプ への変換を定義していない

は重いものを引き出し、私の水晶玉の中に...テーブル私が見にそれをplops ... ハイフリンクUsing an std::string as a key for an std::mapは霧の中に不思議に浮かぶ

ああ！それはそれだった。あなたは#include <string>を忘れました。あなたと何が起こるかだ

：

1. が前のコメント投稿者のアドバイスに従うことをMCVE

2. ネグレクトを生成しないと、「あなたが持っている場合は、二重チェック#include <string>」