c++ std::function

测试代码：

#include <iostream>
#include <functional>int addFunc(int a, int b) {return a + b;
}void testFunction() {// 声明一个function，接受俩个int参数，返回int数据std::function<int(int, int)> func;// 绑定不同的可调用对象// 普通函数func = addFunc;cout << "9526 + 1 :" << func(9526, 1) << endl;// lambda表达式func = [](int a, int b) { return a - b;};cout << "9528 - 1 :" << func(9528, 1) << endl;// 成员函数class Calculator {public:int sub(int a, int b) { return a - b; }static int staticFuncAdd(int a, int b) { return a + b; }};Calculator calc;// 绑定对象和成员函数func = std::bind(&Calculator::sub, &calc, std::placeholders::_1, std::placeholders::_2);cout << "0 - 1 = " << func(0, 1) << endl;// 绑定静态成员函数func = &Calculator::staticFuncAdd;cout << "1 + 1 = " << func(1, 1) << endl;//仿函数class Divider {public:int operator()(int a, int b) {return a / b;}};Divider div;func = div;cout << "10 / 3 = " << func(10, 3) << endl;
}

打印：

ok