C++11学习笔记之三lamda表达式，std::function, std::bind

//lamda
//first lamda
[]
{};

// second lamda
[]() //or no need () when paramater is null
{
std::cout << "second" << std::endl;
}();// last add(), express will call this lamda func

// 3 with return type
auto kkk = []()
{
return 1;
}();

// 4, set return type
auto kkkk = [] (int i) -> bool { return (bool)i; }(5);

//5, lamda capture, [=], [=,&], [&], [this][] 不捕获...
/*[&] 以引用的方式捕获
[=] 通过变量的一个拷贝捕获
[=, &foo] 通过变量的拷贝捕获，但是用foo变量的引用捕获
[bar] 通过复制捕获，不要复制其他
[this] 捕获this指针对应成员
*/

function, bind等，上代码

#include <iostream>

#include <functional>

using namespace std;

typedef std::function<void()> fp;

typedef std::function<void(int)> fpi1;

void g_fun()

{

    std::cout << "global function bind" << std::endl;

}

class A

{

public:

    static void aFunStatic()

    {

        std::cout << "aFunStatic" << std::endl;

    }

    virtual void aFun()

    {

        std::cout << "aFun" << std::endl;

    }

    void aFunI1(int i)

    {

        std::cout << "aFunI1:"  << i << std::endl;

    }

};

class DerivedA

    :public A

{

public:

    virtual void aFun() override

    {

        std::cout << "aFun in DeriveA" << std::endl;

    }

};

class B

{

public:

    void bCallAFun()

    {

        if(callFun)

            callFun();

    }

    void bCallAFunStatic()

    {

        if(callFunStatic)

            callFunStatic();

    }

    void bCallAFunI1(int i)

    {

        if(callFunI1)

            callFunI1(i);

    }

    fp callFunStatic;

    fp callFun;

    fpi1 callFunI1;

};

void main()

{

    B b;

    A a;

    //bind to global function

    fp f = fp(&g_fun);

    f();

    //bind to class function

    //static

    b.callFunStatic = std::bind(&A::aFunStatic);

    b.bCallAFunStatic();

    //no static function without parameter

    b.callFun = std::bind(&A::aFun, &a);

    b.bCallAFun();

    //no static function with parameter

    b.callFunI1 = std::bind(&A::aFunI1, &a, std::placeholders::_1);

    b.bCallAFunI1();

    //about polymorphic

    DerivedA da;

    b.callFun = std::bind(&A::aFun, &da);

    b.bCallAFun();

}

巴特西

C++11学习笔记之三lamda表达式，std::function, std::bind

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