匿名函數在vc中的使用

看到js中的匿名函數，總以爲很炫，一查，這個是業界標準，php、java、c++都已經支持，連忙查下網絡學習下，查到這篇寫的不錯，介紹了lambda expression在c++中的調用

http://www.cprogramming.com/c++11/c++11-lambda-closures.html

參考它，我寫了測試代碼練下。

#include "stdafx.h"

#include <iostream>

#include <string>

#include <map>

#include <algorithm>

#include <functional>

using namespace std;

void testCase1()

{

map<int, string> datas;

datas[0] = "zero";

datas[1] = "one";

datas[2] = "two";

for_each(datas.begin(), datas.end(), [](pair<int, string> pair){

cout << pair.first << "\t" << pair.second << endl;

});

}

void testCase2()

{

map<int, string> datas;

datas[0] = "zero";

datas[1] = "one";

datas[2] = "two";

for(auto pos = datas.begin(); pos != datas.end(); pos++)

{

cout << pos->first << "\t" << pos->second << endl;

}

}

void testCase3()

{

std::function<void (pair<int, string>) > output;

map<int, string> datas;

datas[0] = "zero";

datas[1] = "one";

datas[2] = "two";

/*

output = [](pair<int, string> _pair){

cout << _pair.first << "\t" << _pair.second << endl;

cout << datas.size() << endl;

};

*/

output = [&](pair<int, string> _pair){

cout << _pair.first << "\t" << _pair.second << endl;

cout << datas.size() << endl;

};

if(output)

{

for_each(datas.begin(), datas.end(), output);

}

}

int _tmain(int argc, _TCHAR* argv[])

{

string input;

testCase1();

testCase2();

testCase3();

cin>>input;

return 0;

}