[C++知识库]C++std::package_task

#include "thread_pool.h"
#include <iostream>
#include <vector>
#include <thread>
#include <list>
#include <mutex>
using namespace std;

int myth(int m)
{
	cout << "myth start() " << "th_id:" << std::this_thread::get_id() << endl;
	std::chrono::milliseconds dura(5000);
	std::this_thread::sleep_for(dura);
	cout << "myth end() " << "th_id" << std::this_thread::get_id() << endl;
	return m;

}
int main()
{
	//一、std::packaged_task:打包任务
	//类模板，他的模板参数使各种可调用参数，吧各种可调用对象包装起来，方便将来作为线程入口函数调用
	cout << "mian() " << "th_id:" << std::this_thread::get_id() << endl;
	//std::packaged_task<int(int)>mypt(myth);//我们把函数myth通过packaged_task包装起来
	//lambde
	std::packaged_task<int(int)>mypt([](int x) {
	cout << "myth start() " << "th_id:" << std::this_thread::get_id() << endl;
	std::chrono::milliseconds dura(5000);
	std::this_thread::sleep_for(dura);
	cout << "myth end() " << "th_id" << std::this_thread::get_id() << endl;
	return x;
	
	});//我们把函数myth通过packaged_task包装起来

	thread t1(std::ref(mypt), 2);// 线程直接开始执行，2是函数myth里面的参数
	t1.join();
	std::future<int> res = mypt.get_future();//future对象李包含线程入口函数返回的结果
	int result = res.get();





	return 0;



}