我正在创建一个使用set来保存pair值的地图数据结构。我为这个程序制作了一个自定义的对班。我已经完成了大部分的调试工作,现在我正在使用xfunction类构建这些错误。我在类中构建的xfunction中出错,我不知道该怎么办
错误6错误C2784: '布尔的std ::操作<(常量的std :: basic_string的< _Elem,_Traits,_Alloc> &,常量_Elem *)':不能推导出模板参数的“常量的std :: basic_string的< _Elem,_Traits,_Alloc> & '从 '常量对' C:\程序文件(86)\微软的Visual Studio 10.0 \ VC \包括\ xfunctional 125
错误7错误C2784:' 布尔的std ::操作者<( const _Elem *,const std :: basic_string < _Elem,_Traits,_Alloc> &)':无法从'const Pair'c:\ program files(x86)\ microsoft visual studio 10.0 \中推导出'const _Elem *'的模板参数。 VC \包括\ xfunctional 125
错误8错误C2784: '布尔的std ::操作者<(常量的std :: basic_string的< _Elem,_Traits,_Alloc> &,常量性病:: basic_string的< _Elem,_Traits,_Alloc> &)' :不能推导出模板参数的 '常量的std :: basic_string的< _Elem,_Traits,_Alloc> &' 从 '常量对' C:\ Program Files文件(x86)的\微软的Visual Studio 10.0 \ VC \包括\ xfunctional 125
错误9错误C2784:'bool std :: operator <(const std :: move_iterator < _RanIt> &,const std :: move_iterator < _RanIt2> &)':无法为const const std :: move_iterator < _RanIt> &'从const对'推导出模板参数c:\ program files(x86)\ microsoft visual studio 10.0 \ vc \ include \ xfunctional 125
错误10错误C2784: '布尔的std ::操作<(常量的std :: _树< _Traits> &,常量的std :: _树< _Traits> &)':不能推导出模板参数的“常量的std :: _树< _Traits> &'from'const Pair'c:\ program files(x86)\ microsoft visual studio 10.0 \ vc \ include \ xfunctional 125
E rror 11 error C2784:'bool std :: operator <(const std :: list < _Ty,_Ax> &,const std :: list < _Ty,_Ax> &)':无法推导出'const std ::列表< _Ty,_AX> & '从 '常量对' C:\程序文件(86)\微软的Visual Studio 10.0 \ VC \包括\ xfunctional 125
错误12错误C2784:' 布尔的std ::操作者<(常量的std ::的unique_ptr < _Ty,_Dx> &,常量的std ::的unique_ptr < _Ty2,_Dx2> &)”:不能推导出模板参数 '常量的std ::的unique_ptr < _Ty,_Dx> &' 从 '常量配对' C:\亲克文件(x86)\ microsoft visual studio 10。0 \ VC \包括\ xfunctional 125
错误13错误C2784: '布尔的std ::操作者<(常量的std :: reverse_iterator的< _RanIt> &,常量性病:: reverse_iterator的< _RanIt2> &)':无法推断模板参数关于 '常量性病:: reverse_iterator的< _RanIt> &' 从 '常量对' C:\程序文件(86)\微软的Visual Studio 10.0 \ VC \包括\ xfunctional 125
错误14错误C2784:“布尔std :: operator <(const std :: _ Revranit < _RanIt,_Base> &,const std :: _ Revranit < _RanIt2,_Base2> ''从'const Pair'c:\ program files(x86)\ microsoft visual studio 10.0 \ vc \ include \ xfunctional 125
''无法为'const std :: _ Revranit推演模板参数'_RanIt,_Base> &'错误15错误C2784: '布尔的std ::操作者<(常量的std ::对< _Ty1,_Ty2> &,常量性病::对< _Ty1,_Ty2> &)':无法推断出模板参数关于“常量性病:: pair < _Ty1,_Ty2> &'from'const Pair'c:\ program files(x86)\ microsoft visual studio 10.0 \ vc \ include \ xfunctional 125
Error 16 erro r C2676:二进制'<':'const Pair'未定义此运算符或转换为预定义运算符可接受的类型c:\ program files(x86)\ microsoft visual studio 10.0 \ vc \ include \ xfunctional 125
这里是我的map2.h代码
#ifndef MAP_H_2
#define MAP_H_2
#include <list>
#include <set>
#include <utility>
#include <iterator>
#include <iostream>
#include <string>
using namespace std;
//pair class header
template<typename F, typename S>
class Pair
{
public:
Pair(const F& a, const S& b);
Pair();
F get_first() const;
S get_second() const;
private:
F first;
S second;
};
//pair class definitions
template<typename F, typename S>
inline Pair<F, S>::Pair(const F& a, const S& b):first(a),second(b){}
template<typename F, typename S>
inline Pair<F, S>::Pair()
{
}
template<typename F, typename S>
inline F Pair<F, S>::get_first() const
{
return first;
}
template<typename F, typename S>
inline S Pair<F, S>::get_second() const
{
return second;
}
//map header
class map2
{
public:
map2();
void at_put(string key, int value);
Pair<string, int> at(string key);
bool contain_key(string key);
int value_of(string key);
void remove_key(string key);
void print();
private:
set<Pair<string, int>> theList;
};
//map definition
map2::map2(){}
void map2::at_put(string key, int value)
{
bool notThere = true;
if(contain_key(key))
{
notThere = false;
}
if(notThere)
{
Pair<string, int> thePair(key, value);
theList.insert(thePair);
}
}
Pair<string, int> map2::at(string key)
{
set<Pair<string, int>>::iterator iter = theList.begin();
Pair<string, int> thePair;
string temp;
for(int x = 0; x<theList.size() ; x++)
{
thePair = *iter;
temp = thePair.get_first();
if(!key.compare(temp))
{
return thePair;
}
iter++;
}
Pair<string, int> noPair = Pair<string, int>("none", -1);
return noPair;
}
bool map2::contain_key(string key)
{
set<Pair<string, int>>::iterator iter = theList.begin();
Pair<string, int> thePair;
string temp;
for(int x = 0; x<theList.size() ; x++)
{
thePair = *iter;
temp = thePair.get_first();
if(!key.compare(temp))
{
return true;
}
iter++;
}
return false;
}
int map2::value_of(string key)
{
set<Pair<string, int>>::iterator iter = theList.begin();
Pair<string, int> thePair;
string temp;
for(int x = 0; x<theList.size() ; x++)
{
thePair = *iter;
temp = thePair.get_first();
if(!key.compare(temp))
{
return thePair.get_second();
}
iter++;
}
return NULL;
}
void map2::remove_key(string key)
{
set<Pair<string, int>>::iterator iter = theList.begin();
Pair<string, int> thePair;
string temp;
for(int x = 0; x<theList.size() ; x++)
{
thePair = *iter;
temp = thePair.get_first();
if(!key.compare(temp))
{
theList.erase(iter);
}
iter++;
}
}
void map2::print()
{
set<Pair<string, int>>::iterator iter = theList.begin();
Pair<string, int> thePair;
string temp;
int temp2;
for(int x = 0; x<theList.size() ; x++)
{
thePair = *iter;
temp = thePair.get_first();
temp2 = thePair.get_second();
cout << "Key:" << temp << " Value:" << temp2 << "\n";
iter++;
}
}
#endif
,这里是我的代码具有的主要功能
#include "map2.h"
#include <string>
#include <iostream>
using namespace std;
int main()
{
map2 theMap;
theMap.at_put("John", 1000);
theMap.at_put("Chris", 1000);
theMap.at_put("John", 1500);
theMap.at_put("Bob", 1250);
theMap.print();
theMap.remove_key("bob");
theMap.print();
string findKey;
cout << "please enter a key to remove" << "\n";
cin >> findKey;
bool keyFound = theMap.contain_key(findKey);
if(keyFound)
{
cout << "We found it! The value is:" << theMap.value_of(findKey) << "\n";
}
else
{
cout << "we don’t have this key " << findKey << "in the map" << "\n";
}
}