Simple demo of c++ thread.

testing_thread.cc

#include <iostream>
#include <thread>

// CPP program to demonstrate multithreading 
// using three different callables. 
#include <iostream> 
#include <thread> 
using namespace std; 

// A dummy function 
void foo(int Z) 
{ 
	for (int i = 0; i < Z; i++) { 
		/*
		clog << "Thread using function"
			" pointer as callable\n"; 
		*/
		clog << "Thread " << "using " << "function " << "pointer " << "as " << "callable" << std::endl;
	} 
} 

// A callable object 
class thread_obj { 
public: 
	void operator()(int x) 
	{ 
		for (int i = 0; i < x; i++) 
			/*
			clog << "Thread using function"
				" object as  callable\n"; 
			*/
		clog << "Thread " << "using " << "function " << "object " << "as " << "callable" << std::endl;
	} 
}; 

int main() 
{ 
	clog << "Threads 1 and 2 and 3 "
		"operating independently" << endl; 

	// This thread is launched by using  
	// function pointer as callable 
	thread th1(foo, 200); 

	// This thread is launched by using 
	// function object as callable 
	thread th2(thread_obj(), 200); 

	// Define a Lambda Expression 
	auto f = [](int x) { 
		for (int i = 0; i < x; i++) 
			/*
			clog << "Thread using lambda"
				" expression as callable\n"; 
			*/
		clog << "Thread " << "using " << "lambda " << "expression " << "as " << "callable" << std::endl;
	}; 

	// This thread is launched by using  
	// lamda expression as callable 
	thread th3(f, 200); 

	// Wait for the threads to finish 
	// Wait for thread t1 to finish 
	th1.join(); 

	// Wait for thread t2 to finish 
	th2.join(); 

	// Wait for thread t3 to finish 
	th3.join(); 

	return 0; 
}