c++11

void printA(int a)

{

    cout<<a<<endl;

}

 std::function<void(int a)> func;

 func = printA;

 func(2);

std::function<void()> func_1 = [](){cout<<"hello world"<<endl;};

    func_1();

struct Foo {

    Foo(int num) : num_(num) {}

    void print_add(int i) const { cout << num_+i << ‘\n‘; }

    int num_;

};
 // 保存成员函数

    std::function<void(const Foo&, int)> f_add_display = &Foo::print_add;

    Foo foo(2);

    f_add_display(foo, 1);

uto closeItem = MenuItemImage::create(

                                           "CloseNormal.png",

                                           "CloseSelected.png",

                                           CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));

void HelloWorld::menuCloseCallback(Object* pSender)

{

    Director::getInstance()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

    exit(0);

#endif

}