C++11 map erase lambda编译出错

[zhousitiaoda]

std::map<CString,CString> mapCheck;
mapCheck.erase(std::remove_if(mapCheck.begin(),mapCheck.end(),[&](const std::pair<CString,CString>& item)
        {
           return TRUE;
        }),mapCheck.end());

请教下，编译出错，没太明白
error C2678: 二进制“=”: 没有找到接受“const ATL::CString”类型的左操作数的运算符(或没有可接受的转换)

把CString换成int，OK，把map换成vector，OK，请教下大神。。

[zhousitiaoda]

已解决，为方便后人还是贴下原因： the similarly-named container member functions list::remove, list::remove_if, forward_list::remove, and forward_list::remove_if erase the removed elements. These algorithms cannot be used with associative containers such as std::set and std::map because ForwardIt does not dereference to a MoveAssignable type (the keys in these containers are not modifiable

[jiqiang01234]

已经有erase了，还要remove_if()，是什么意思？