Multithreading :1.Create thread

We will be using std::thread class to create threads.
std:thread is introduced in C++11.
We can start creating threads by including the thread header file. To create a thread, we need to pass the code that needs to be executed in the constructor of the thread.
As soon as the thread object is created, a new thread is launched, which will execute the code passed to the constructor.


The constructor takes

• a function object
• a function pointer
• a  lambda expression

	#include<thread>
	#include<iostream>
	using namespace std;
	class print_obj {
	public:
	void operator()(int max)
	{
	cout << "Thread with function object" << endl;;
	for (int i = 0; i < max; i++)
	{
	cout << i << endl;
	}
	}
	};
	void main()
	{
	//creating a thread with a function pointer
	thread t1(print, 50);
	//creating a thread with a function object
	thread t2(print_obj(), 100);
	//below is a lambda expression
	auto printlambda = [](int max) {
	cout << "thread with lambda function" << endl;
	for (int i = 0; i < max; i++)
	cout << i << endl;
	};
	//creating a thread with a lambda
	thread t3(printlambda, 150);
	}

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