（7）C++函數綁定---function,bind

// CppTest.cpp : 此文件包含 "main" 函數。程序執行將在此處開始並結束。
//

#include <iostream>
#include <thread>
#include <windows.h>
#include <string>
#include <mutex>
#include <functional>
#include <chrono>
int number = 0;

std::mutex mtx;
void fun1()
{
	
	for (int i = 0; i < 1000; i++)
	{
		std::unique_lock<std::mutex> lck(mtx);
		number++;
		std::cout << number << std::endl;
	}
}
void fun2()
{
	
	for (int i = 0; i < 1000; i++)
	{
		std::unique_lock<std::mutex> lck(mtx);
		number--;
		std::cout << number << std::endl;
	}
}


class demo
{
public:
	demo() {}
	~demo() {}
public:
	void print(std::string msg)
	{
		std::unique_lock<std::mutex> lck(mtx);
		//for (int i = 0; i < (int)msg; i++)
		//{
			std::this_thread::sleep_for(std::chrono::milliseconds(200));
			std::cout << msg << std::endl;

		//}

	}

	void threadPrintMsg(std::string n)
	{
		std::function<void(std::string)> fun;
		fun = std::bind(&demo::print, this,std::placeholders::_1); //綁定類成員函數
		//fun = std::bind(&demo::print, this,std::placeholders::_1，std::placeholders::_2);//多個參數
		std::thread *th = new std::thread(fun,n);//往線程中傳參
		//std::thread *th = new std::thread(fun, n1，n2);//多參數
	}

};
int main()
{
	std::function<void(void)>f;  //指向返回值爲空，參數列表爲空的函數

	std::function<int(double, double)> f2;//指向返回值爲int，參數列表爲(double,double)的函數

	demo* de = new demo();
	std::string msg = "aaaa";
	de->threadPrintMsg(msg);

	f = fun1;//綁定函數


	std::thread th1(f);
	std::thread th2(fun2);
	th1.join();//等待線程執行完成後再執行後續代碼
	th2.join();
	//th1.detach();
	//th2.detach(); //直接運行主線程


	system("pause");

	return 0;
}