[Home]  [Edit this page]  [Recent Changes]  [Special Pages]  [Help] 

---

CppIncludeGuard

---

(C++) #include guard

This preprocessor statements #ifndef ,#define and #endif can be used for #include guards. These prevent a header file (.h) to be #included multiple times, causing a redeclaration error.

An #include guard

ifndef __MYHEADERFILE_H

define __MYHEADERFILE_H


//Your header (.h) file
endif

An implementation file (.cpp) does not have #include guards, because they do not get #included, but 'Added to Project' instead.

Always write internal #include guards [1]. Never write external #include guards [1].

'#include guard' links

• C

Reference

• 1) Herb Sutter and Andrei Alexandrescu. C++ coding standards: 101 rules, guidelines, and best practices. ISBN: 0-32-111358-6. Chapter 24: 'Always write internal #include guards. Never write external #include guards'.

[Edit this page]  [Page history]  [What links here]  [Discuss this topic]  [Printer Friendly]