Conditional compilation of statements¶

!ifdef	Compile statements only if a symbol has been defined
!ifndef	Compile statements only if a symbol has not been defined
!else	Optional clause in an !ifdef or !ifndef construct
!endif	Declare the end of an !ifdef or !ifndef construct

SYNTAX

!ifdef | !ifndef symbol
    statements
[!else
    statements]
!endif

!ifdef	The statements between an !ifdef and the corresponding !endif are included by the compiler only if the named symbol has been previously defined with a !define statement. The optional !else clause may be used to list statements which are to be included only if the first set of statements are excluded, and vice versa.
!ifndef	The above rules are simply reversed for !ifndef. The statements between an !ifndef and the corresponding !endif are included by the compiler only if the named symbol has not been previously defined with a !define statement. The optional !else clause may be used to list statements which are to be included only if the first set of statements are excluded, and vice versa.
!else	This optional clause in an !ifdef or !ifndef construct is used to list statements which are to be included only if the first set of statements are excluded, and vice versa.
!endif	Every !ifdef or !ifndef declaration must have a matching !endif to mark the end of the code it controls.

NOTES

The statements following an !ifdef, !ifndef or !else declaration may contain other complete !ifdef and !ifndef constructs.
A symbol may also be defined by using the -D option when a program is compiled with the source code compiler scc.
Certain manifest constants are already predefined in Sculptor. These are mostly located in standard include files in the directory $SCULPTOR/include. See Standard include files.

EXAMPLE

!ifdef SAGE
     DisplayMessage(Msg)
!else
     PrintMessage(Msg)
!endif

RELATED TOPICS

!define