Fb Iif

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FB_IIF

Intrinsic define (macro) performed by the compiler.

Syntax

__FB_IIF__( compare-expr, true-expr, false-expr )

Parameters

• compare-expr
• true-expr
• compare-expr
• false-expr
• compare-expr

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.

Remarks

Differences from QB

• New to FreeBASIC

See also

• #if
• #else
• #endif

Examples

' 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

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Category: Intrinsic Defines
Kind: keyword

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.