Top "Include-guards" questions

Anything related to C/C++ include guards technique, i.e. a technique employing C-preprocessor conditional compilation features in order to prevent multiple inclusion of header files in C/C++ source files.

Creating your own header file in C

Can anyone explain how to create a header file in C with a simple example from beginning to end.

c header include include-guards c-header
Prevent direct access to a php include file

I have a php file which I will be using as exclusively as an include. Therefore I would like to …

php include include-guards
Is #pragma once a safe include guard?

I've read that there is some compiler optimization when using #pragma once which can result in faster compilation. I recognize …

c++ include-guards
C++ #include guards

SOLVED What really helped me was that I could #include headers in the .cpp file with out causing the redefined …

c++ header include include-guards
Header guards in C++ and C

At LearnCpp.com | 1.10 — A first look at the preprocessor. Under Header guards, there are those code snippets: add.h: #include "…

c++ c macros header-files include-guards
Should variable definition be in header files?

My very basic knowledge of C and compilation process has gone rusty lately. I was trying to figure out answer …

c linker c-preprocessor header-files include-guards
Why aren't my include guards preventing recursive inclusion and multiple symbol definitions?

Two common questions about include guards: FIRST QUESTION: Why aren't include guards protecting my header files from mutual, recursive inclusion? …

c++ header-files c++-faq include-guards
difference between "ifndef" and "if !defined" in C?

I have seen #ifndef ABC and #if !defined (ABC) in the same C source file. Is there subtle difference between …

c include-guards
What exactly do C include guards do?

I have a question regarding include guards in C. I've done a bit of reading but would appreciate a little …

c macros c-preprocessor header-files include-guards
Why can std::max and std::min still be used even if I didn't #include <algorithm>?

#include <iostream> int main() { int value1 = 1, value2 = 10; std::cout << "Min = " << std::min(value1,value2) &…

c++ preprocessor-directive include-guards