c++ - STL Map 在搜索尝试时抛出错误

Question

我正在尝试创建一个充满字符串作为键和整数作为值的映射。当我尝试使用它进行搜索时，问题就开始了。有人可以告诉我哪里出错了吗？是我在同一条语句中有两个Map吗？

    invale is "ale"
    roomno = 2;
    // roomlist is a map
    // rinventory is another map

    if( roomlist[roomno].rinventory.find( invale ) != map<string, int>::end());

我得到的错误如下。什么重载函数？这确实是一个冗长的错误。

error C2668: 'std::_Tree<_Traits>::end' : ambiguous call to overloaded function
1>        with
1>        [
1>            _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false>
1>        ]
1>        c:\program files\microsoft visual studio 9.0\vc\include\xtree(569): could be 'std::_Tree<_Traits>::const_iterator std::_Tree<_Traits>::end(void) const'
1>        with
1>        [
1>            _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false>
1>        ]
1>        c:\program files\microsoft visual studio 9.0\vc\include\xtree(564): or       'std::_Tree<_Traits>::iterator std::_Tree<_Traits>::end(void)'
1>        with
1>        [
1>            _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false>
1>        ]
1>        while trying to match the argument list '(void)'    

提前谢谢你。

Answer 1

尝试将其更改为:

if( roomlist[roomno].rinventory.find( invale ) != roomlist[roomno].rinventory.end());