rikkimax/macro_preprocessor.md

Created February 22, 2016 14:19

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#define Identifier Literal
- Modifies the translation unit
- Identifier#1 is replaced by Literal#1
#undef Identifier
- Behaves as #define Identifier#1 $empty
#ifdef Identifier
- Retrives from the translation unit
- Conditional part of file to parse
#else Alternative flow of a conditional statement.
- Follows from:
  - #if
  - #ifdef
  - #elseif
  - #elif
- Conditional part of file to parse and is always valid
#ifndef Identifier If the identifier exists, ignores the given block.
- Value of Identifier#1 is negated Negation can be:
  - $true or $false
  - $value or $empty
- Behaves as #ifdef Identifier#1

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