Difference between revisions of "IFDEF"
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==Purpose== | ==Purpose== | ||
Compiler directives to allow inclusion or exclusion of source code based on a compile-time constant | Compiler directives to allow inclusion or exclusion of source code based on a compile-time constant | ||
| Line 12: | Line 5: | ||
==Syntax== | ==Syntax== | ||
#IFDEF <constant> | #IFDEF <constant> | ||
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[<statements1>] | [<statements1>] | ||
| + | |||
[#ELSE] | [#ELSE] | ||
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[<statements2>] | [<statements2>] | ||
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#ENDIF | #ENDIF | ||
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#DEFINE RECITAL 1 | #DEFINE RECITAL 1 | ||
#IFDEF RECITAL | #IFDEF RECITAL | ||
| − | + | set compatible to recital | |
| − | + | set filetype to recital | |
#ELSE | #ELSE | ||
| − | + | set compatible to vfp | |
| − | + | set filetype to vfp | |
#ENDIF | #ENDIF | ||
</code> | </code> | ||
| Line 43: | Line 40: | ||
==Products== | ==Products== | ||
| − | Recital | + | Recital Server, Recital |
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Commands]] | [[Category:Commands]] | ||
| + | [[Category:Applications]] | ||
| + | [[Category:Applications Commands]] | ||
Latest revision as of 16:55, 11 November 2009
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 Server, Recital
