Differences

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--- glossary:glossary_i [2021/08/11 09:24] – [ICSP] WortingUK
+++ glossary:glossary_i [2022/01/26 10:40] – [Include Guard] WortingUK
@@ Line 17: / Line 17: @@
 AVR ATMEGA chips use a 6 pin connector based on SPI bus. (Optional on Arduino AVR modules)\\
 Atmel SAMD chips have a OneWire ICSP (signal/0v/power).
 ===== Incandescent lamps =====
@@ Line 27: / Line 29: @@
  \\ [[http://www.kpsec.freeuk.com/components/lamp.htm|http://www.kpsec.freeuk.com/components/lamp.htm]]
+===== Include Guard =====
+A method of preventing a C or C++ header source file (.h or .hpp), from being included more than once by other files. It uses 'compiler directives' ''#'' to do this.
+''#ifndef _FILENAME_H_''
+''#define _FILENAME_H_''
+''/*  contents of the header file go here */''
+''#endif /* _FILENAME_H_ */''
+If the compiler supports it, then following can be used
+''#pragma once''
+''/*  contents of the header file go here */''