find_if和函数对象结合实现对自定义类型vector的查找.docVIP

 HYPERLINK /wo17fang/article/detailsfind_if和函数对象结合实现对自定义类型vector的查找 实现NAT穿透需要对client的IP和port 进行同时查找，这就需要自定义的结构体，然后声明一个此种类型的vector,每次客户发起连接的时候都要查找一下此表，如果存在此客户端的ip 和port 就返回，否则将此结构体加入到转发列表中。#include stdafx.h #include iostream #include string?#include functional#include list?#include vector#include algorithm?using namespace std; typedef struct __NAT{char userip[30];int? userport;} natType;//查找类 class FindIP{public:?bool operator()(natType dValue)?{?return (strcmp(dValue.userip,m_val.userip)==0)dValue.userport==m_val.userport;???} ?static void SetUserNat(natType dval)?{? m_val = dval;?}private:?static natType m_val;}; natType natvalue,destvalue;natType FindIP::m_val = natvalue;int main(int argc, char* argv[]){? vector natType userList;??? natType tempnat;?strcpy(tempnat.userip,);?tempnat.userport=9000;?userList.push_back(tempnat);? //,destvalue;?? strcpy(natvalue.userip,);?? natvalue.userport=9000;?? FindIP::SetUserNat(natvalue);????? vector natType :: iterator iter=find_if(userList.begin(), userList.end(), FindIP()) ;?? if(iter==userList.end())?? {? /* strcpy(destvalue.userip,(*iter).userip);?? */destvalue.userport=(*iter).userport;?? printf(nothing/n); ??? userList.push_back(natvalue);?? }??return 0;}