我正在编译VC ++ 2010.以下代码用于作业：
#include <iostream>
#include <map>
#include "PaintJobEst.h"
using namespace std;
int main( void )
{
map< string, double > data;
double numRooms = 0, costPerGallon = 0, sqrFtWallSpace = 0;
cout << "How many rooms wil you be painting today? " << endl;
cin >> numRooms;
const bool numRoomsAtLeastOne = ( numRooms >= 1 );
if ( !numRoomsAtLeastOne )
{
cout << "INVALID ENTRY: Please enter a value greater than or equal to 1 for the amount of rooms you wish to paint" << endl;
main();
}
cout << "What is the cost of paint per gallon? " << endl;
cin >> costPerGallon;
const bool costCheck = ( costPerGallon >= 10.00 );
if ( !costCheck )
{
cout << "INVALID ENTRY: Please enter a value greater than or equal to 10.00 for the cost-per-gallon of paint you wish to use." << endl;
main();
}
cout << "What is the square feet of wallspace per gallon of paint you wish to cover? " << endl;
cin >> sqrFtWallSpace;
const bool sqrFeetCheck = ( sqrFtWallSpace >= 0 );
if ( !sqrFeetCheck )
{
cout << "INVALID ENTRY: Please enter a value which is NON-NEGATIVE for covering the square feet of wallspace per gallon" << endl;
main();
}
data.insert( pair< string, double >( "numRooms", numRooms ) );
data.insert( pair< string, double >( "costPerGallon", costPerGallon ) );
data.insert( pair< string, double >( "sqrFtWallSpace", sqrFtWallSpace ) );
Estimate( data );
system("pause");
}
然而，当我编译它时，我会遇到与xfunctional文件的方式有关的奇怪错误。为什么会这样，我不知道。我错过了某处的包含文件吗？
错误
>------ Build started: Project: Project17, Configuration: Debug Win32 ------
1> main.cpp
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <'
1> 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'
1> with
1> [
1> _Ty=std::string
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\map(71) : see reference to class template instantiation 'std::less<_Ty>' being compiled
1> with
1> [
1> _Ty=std::string
1> ]
1> 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
1> with
1> [
1> _Kty=std::string,
1> _Ty=double,
1> _Pr=std::less<std::string>,
1> _Alloc=std::allocator<std::pair<const std::string,double>>,
1> _Mfl=false
1> ]
1> 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
1> with
1> [
1> _Traits=std::_Tmap_traits<std::string,double,std::less<std::string>,std::allocator<std::pair<const std::string,double>>,false>
1> ]
1> 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
1> with
1> [
1> _Traits=std::_Tmap_traits<std::string,double,std::less<std::string>,std::allocator<std::pair<const std::string,double>>,false>
1> ]
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<std::string,double,std::less<std::string>,std::allocator<std::pair<const std::string,double>>,false>
1> ]
1> c:\users\holland\documents\code\projects\studying\chapter6\project17\project17\main.cpp(13) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1> with
1> [
1> _Kty=std::string,
1> _Ty=double
1> ]
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\memory(2582) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\memory(2582) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\memory(2582) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(1356) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(1356) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(1356) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(1179) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(1179) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(1179) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(318) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(318) : see declaration of 'std::operator <'
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\utility(318) : see declaration of 'std::operator <'
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\xfunctional(125): error C2676: binary '<' : 'const std::string' does not define this operator or a conversion to a type acceptable to the predefined operator
1> PaintJobEst.cpp
1>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::string'
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xtree(1885) : see declaration of 'std::operator <'
1> 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'
1> with
1> [
1> _Ty=std::string
1> ]
1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\map(71) : see reference to class template instantiation 'std::less<_Ty>' being compiled
1> with
1> [
1> _Ty=std::string
1> ]
1> 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
1> with
1> [
1> _Kty=std::string,
1> _Ty=double,
1> _Pr=std::less<std::string>,
1> _Alloc=std::allocator<std::pair<const std::string,double>>,
1> _Mfl=false
1> ]
1> 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
1> with
1> [
1> _Traits=std::_Tmap_traits<std::string,double,std::less<std::string>,std::allocator<std::pair<const std::string,double>>,false>
1> ]
1> 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
1> with
1> [
1> _Traits=std::_Tmap_traits<std::string,double,std::less<std::string>,std::allocator<std::pair<const std::string,double>>,false>
1> ]
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<std::string,double,std::less<std::string>,std::allocator<std::pair<const std::string,double>>,false>
1> ]
1> c:\users\holland\documents\code\projects\studying\chapter6\project17\project17\paintjobest.cpp(9) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1> with
1> [
1> _Kty=std::string,
1> _Ty=double
1> ]
答案 0 :(得分：7)
添加#include <string>，VC ++ 2010上的问题就消失了。