#pragma once | Learn C Games Programming Blog https://learncgames.com A blog about C, programming games and my ebook(s). Fri, 26 Jun 2020 13:02:35 +0000 en hourly 1 https://wordpress.org/?v=6.9.4 https://learncgames.com/wp-content/uploads/2020/03/cropped-favicon-32x32.png #pragma once | Learn C Games Programming Blog https://learncgames.com 32 32 181446779 Should you use #pragma once? https://learncgames.com/should-you-use-pragma-once/?utm_source=rss&utm_medium=rss&utm_campaign=should-you-use-pragma-once Wed, 01 Jul 2020 23:00:07 +0000 https://learncgames.com/?p=914 The traditional way of using an include guard is to put all of the header inside a #ifdef like this. #ifndef hr_time #define hr_time #include <linux/time.h> #include // rest of code here #endif However the modern way is to put this at the top of the header file. #pragma once And this seems supported by […]

The post Should you use #pragma once? first appeared on Learn C Games Programming Blog.]]> Pragma as found by google image searchThe traditional way of using an include guard is to put all of the header inside a #ifdef like this.

#ifndef hr_time
  #define hr_time
  #include <linux/time.h>
  #include 

// rest of code here
#endif

However the modern way is to put this at the top of the header file.

#pragma once

And this seems supported by most compilers I’ve tried. Certainly Visual Studio C/C++, gcc and clang all work.

In fact when you add a new file and choose header in Visual Studio, it put the #pragma once in automatically for you!

Given that those three C compilers are the main ones I use, I much prefer this pragma and use it.  But I would be interested in hearing of any C compilers that don’t  use it.

 

The post Should you use #pragma once? first appeared on Learn C Games Programming Blog.]]> 914