24.函数信号机制(本质上就是函数指针)

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <boost/signals2.hpp>//信号
#include <cstdlib>

using namespace std;
using namespace boost;

//信号模拟
class button
{
public:
    void connect(void(*f)(int, int));
    void Onclick();
private:
    void(*pfun)(int, int);
};

void button::Onclick()
{
    this->pfun(10, 20);
}

void button::connect(void(*f)(int, int))
{
    //初始化函数指针
    this->pfun = f;
}

void run(int x, int y)
{
    cout << x << y << endl;
}

void main1()
{
    button b1;
    b1.connect(run);
    while (1)
    {
        system("pause");
        b1.Onclick();
    }
    cin.get();
}


class Button
{
    //简化定义
private:
    //函数
    typedef signals2::signal<void(int, int)> Onclick;
    //链接
    typedef signals2::signal<void(int, int)>::slot_type OnSlottype;

public:
    //链接
    signals2::connection connect(const OnSlottype &type);
    //解除链接
    void disconnect0(const signals2::connection &type);
    //按钮按下
    void OnBnclick();

public:
    signals2::connection connect_;//代表链接
    Onclick onclick_;//代表链接的函数
};

//绑定到onclick_
signals2::connection Button::connect(const OnSlottype &type)
{
    return connect_ = onclick_.connect(type);//链接
}

//解除链接
void Button::disconnect0(const signals2::connection &type)
{
    //关闭一个链接
    onclick_.disconnect(connect_);
    //关闭所有的链接
    //onclick_.disconnect_all_slots();
}

//按钮按下
void Button::OnBnclick()
{
    onclick_(10, 20);
}


void main()
{
    Button btn;
    btn.connect(&run);
    while (1)
    {
        system("pause");
        btn.OnBnclick();
        btn.disconnect0(btn.connect_);
    }
    cin.get();
}