The correct title of this article is #ifndef directive. The substitution or omission of the # sign is because of technical restrictions.
 This page contains an entry from the official DM Reference.
|
Format[]
#ifndef Name
Args[]
| Name: | A macro definition. |
Description[]
The #ifndef statement is used to conditionally compile code.
It is equivalent to #if !defined(Name).
See also[]
preprocessor
| |
|---|---|
directives
|
#define | #error | #if | #ifdef | #ifndef | #include | #undef | #warn
|
macros
|
DM_VERSION | __FILE__ | __LINE__ | __MAIN__
|
definitions
|
DEBUG | FILE_DIR
|