Intrinsic define (macro) performed by the compiler.
Syntax
__FB_IIF__( compare-expr, true-expr, false-expr )
Parameters
compare-expr
The comparison expression to test.
A non-zero value evaluates as true, while a value of zero evaluates as false.
true-expr
Source code to return if compare-expr is true.
false-expr
Source code to return if compare-expr is false.
Description
__FB_IIF__ returns source code text depending on the result of a comparison expression evaluated at preprocessing-time.
Its typical use is in the middle of an expression; it avoids splitting it to put a conditional in the middle.
This intrinsic define (macro) differs from the
IIf conditional statement in that
__FB_IIF__ is evaluated at compile-time only and returns source code text.
IIf is evaluated at compile-time only if the
compare-expr is a constant. Otherwise
IIf expressions are evaluated at run-time.
Example
' From the example of the '#ELSE' documentation page:
'#DEFINE MODULE_VERSION 1
'Dim a As String
'#IF (MODULE_VERSION > 0)
' a = "Release"
'#ELSE
' a = "Beta"
'#ENDIF
'Print "Program is "; a
' Simpler code using '__FB_IIF__':
#define MODULE_VERSION 1
Dim a As String
a = __FB_IIF__( MODULE_VERSION > 0, "Release", "Beta" )
Print "Program is "; a
Version
Differences from QB
See also