回调函数解耦理解

#include <iostream>
#include <string>
#include <functional>
#include <thread>

using namespace std;

using Func = function<void(int)>;  //函数指针 意味着是  void A (int B){} 的函数缩写

class Driver
{
private:
    Func func;  //函数指针
public:
    void registerCallback(Func f) //注册 ，形参是函数指针
    {
        func = f;
    }

    void start()
    {
        cout << "driver..." << endl;
        int i = 0;
        while(true)
        {
            func(i);
            cout << "driver start:" << i++ << endl;
            this_thread::sleep_for(chrono::milliseconds(10)); //睡眠10ms
        }
    }
};

class App
{
public:
    App()
    {
        Func func = std::bind(&App::callback, this, std::placeholders::_1); //回调函数
        Driver driver;
        driver.registerCallback(func);
        driver.start();
    }

    void callback(int i)
    {
        cout << "App callback:" << i << endl;
    }
};

int main()
{
    App app;
    return 0;
}