C++ map struct find

参考：http://stackoverflow.com/questions/9647110/using-struct-as-key-and-value-for-map-find-operation-giving-error  【参考2 Answers】

示例：

struct IPPOINT{string ip;string port;};inline bool operator<(IPPOINT const& left, IPPOINT const& right) {if (left.ip < right.ip) { return true; }if (left.ip > right.ip) { return false; }return left.port < right.port;}int main(){IPPOINT i;i.ip = "12";i.port = "22";IPPOINT j;j.ip = "12";j.port = "222";IPPOINT k;k.ip = "12";k.port = "22";map<IPPOINT,int> lst;lst.insert(make_pair<IPPOINT,int>(i,1)); map<IPPOINT,int>::iterator l_it = lst.find(k);if(l_it!=lst.end())cout<<lst[k];l_it = lst.find(j);if(l_it!=lst.end())cout<<lst[j];lst.insert(make_pair<IPPOINT,int>(j,2)); l_it = lst.find(j);if(l_it!=lst.end())cout<<lst[j];return 0;}