(cpp.info) Macros

 
 Macros
 ======
 
    A macro is a sort of abbreviation which you can define once and then
 use later.  There are many complicated features associated with macros
 in the C preprocessor.

 
* Simple Macros    Macros that always expand the same way.
* Argument Macros  Macros that accept arguments that are substituted
                        into the macro expansion.
* Predefined       Predefined macros that are always available.
* Stringification  Macro arguments converted into string constants.
* Concatenation    Building tokens from parts taken from macro arguments.
* Undefining       Cancelling a macro's definition.
* Redefining       Changing a macro's definition.
* Macro Pitfalls   Macros can confuse the unwary.  Here we explain
                        several common problems and strange features.

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