Using Lambdas

Now, let's see the usefulness of Lambda expressions for multithreading. In the following code, we are going to create five threads and put those into a vector container. Each thread will be using a Lambda function as the initialization function. The threads initialized in the following code are capturing the loop index by value:

int main() 
{ 
    std::vector<std::thread> threads; 
 
    for (int i = 0; i < 5; ++i) 
    { 
        threads.push_back(std::thread( [i]() { 
            std::cout << "Thread #" << i << std::endl; 
        })); 
    } 
 
    std::cout << "nMain function"; 
 
    std::for_each(threads.begin(), threads.end(), [](std::thread &t) { 
        t.join(); 
    }); 
} 

The vector container threads store five threads that have been created inside the loop. They are joined at the end of...