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