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How To Use Functor Object With std::thread In C++?

How To Use Functor Object With stdthread In C++

In modern C++ development we can use multi-thread operations and parallel programming features in our applications in different ways of modern programming features. The std::thread class is a special class defined in <thread> header in the concurrency support library that comes with C++11. We can use the std::thread class in multi-thread operations with functor objects, and in this post, we explain how to use std::thread with a functor object in C++.

First, let’s learn what is functor and how we can use it.

What is functor in C++?

A functor is an object that can be used as a function or function pointer, this term is not same as function term in programming. We can pass many arguments with them; thus, we don’t need to define many global variables, we can use these kinds of variables in the scope that we use. We can create operators as given simple functor example below,

What is std::thread in C++?

In modern C++, a concurrency support library is designed to solve problems in multi-thread operations. This library includes built-in support for threads (std::thread), atomic operations (std::atomic), mutual exclusion (std::mutex), condition variables (std::condition_variable), and many other features.

The std::thread class is a special class defined in <thread> header that comes with C++11, and it allows multiple functions to execute and represents a single thread of execution concurrently. We can use the join() method of the thread that waits for the thread to finish its execution. 

Let’s see how we can use std::thread with a functor object in C++.

Is there an example about running functor object with std::thread in C++?

Here is a std::thread example with a functor object ().

Note that, we can use lambda expressions with std::thread which is a modern way of C++ programming.

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About author

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He graduated and received his MSc and PhD degrees from the Department of Mechanical Engineering of Eskisehir Osmangazi University. He is the founder and CEO of ESENJA LLC Company. His interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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