find_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,"192.168.0.1");

tempnat.userport=9000;

userList.push_back(tempnat);

//,destvalue;

strcpy(natvalue.userip,"192.168.0.1");

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;

}