stable_sort缺少运算符 - 定义了自定义比较功能

I call this

我叫这个

bool cmpNAME(const PlayerCard& a, const PlayerCard& b){
    return (a.Name < b.Name);//Name is std::string
}
list<PlayerCard> tmp;
//fill tmp
stable_sort(tmp.begin(), tmp.end(), cmpNAME);//error at this line
bool cmpNAME(const Player