Difference between revisions of "IFDEF"

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=#IFDEF…#ENDIF=
 
 
 
 
==Class==
 
==Class==
 
Applications
 
Applications
Line 37: Line 34:
 
#DEFINE RECITAL 1
 
#DEFINE RECITAL 1
 
#IFDEF RECITAL
 
#IFDEF RECITAL
  set compatible to recital
+
    set compatible to recital
  set filetype to recital
+
    set filetype to recital
 
#ELSE
 
#ELSE
  set compatible to vfp
+
    set compatible to vfp
  set filetype to vfp
+
    set filetype to vfp
 
#ENDIF
 
#ENDIF
 
</code>
 
</code>

Revision as of 10:00, 30 April 2009

Class

Applications


Purpose

Compiler directives to allow inclusion or exclusion of source code based on a compile-time constant


Syntax

#IFDEF <constant>

[<statements1>]

[#ELSE]

[<statements2>]

#ENDIF


See Also

COMPILE, DEFINE, DO, DO CASE, IF, SET COMPILE, SET DEVELOPMENT


Description

The #IFDEF compiler directive can be used to allow inclusion or exclusion of source code based on the existence of a compile-time constant. The constant, <constant>, is defined using the #DEFINE directive. At compile time, the compiler checks if the <constant> is defined. If it is defined, the <statements1> that follow are included in the compiled program file. The <statements1> can be any valid Recital 4GL commands. If the <constant> is not defined, the <statements1> are excluded. If the <constant> is not defined and there is a #ELSE directive specified, the <statements2> following the #ELSE directive are included in the compiled program file.

This directive can only be used in compiled programs.


Example

#DEFINE RECITAL 1
#IFDEF RECITAL
    set compatible to recital
    set filetype to recital
#ELSE
    set compatible to vfp
    set filetype to vfp
#ENDIF


Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer