Fb Uniqueid

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FB_UNIQUEID

Intrinsic define (macro) performed by the compiler.

Syntax

__FB_UNIQUEID__( stack-id )

Parameters

• stack-id

Description

Gets the identifier at the top of stack identified by stack-id (the size of the stack is not modified).
(__FB_UNIQUEID_PUSH__ allows to push a new unique identifier on to the stack, and __FB_UNIQUEID_POP__ allows to pop an identifier off of the stack)

Note:

- The 'stack-id' name itself is a separate namespace from all other symbols. - The stack can only contain 'unique identifiers'. - 'unique identifier' is a name of an fb symbol that is unique to the module, so does not conflict or shadow other symbol names ('unique identifier' will have the form 'LT_xxxx' as a name so it might not be completely unique). - fb uses the form 'LT_xxxx' internally for labels, symbols, temp variables, etc (so should avoid naming symbols of this form in any program).

__FB_UNIQUEID__ simply expands to unquoted text. So the name, for example 'Lt_0004', can be used wherever an fb symbol is required (a variable, procedure name, type name, etc.).
__FB_UNIQUEID__ returns an unquoted empty string when the stack is empty or has never been filled.

Remarks

Differences from QB

• New to FreeBASIC

See also

• __FB_UNIQUEID_PUSH__
• __FB_UNIQUEID_POP__

Examples

__FB_UNIQUEID_PUSH__( stk )

#print __FB_UNIQUEID__( stk )

    __FB_UNIQUEID_PUSH__( stk )

    #print __FB_UNIQUEID__( stk )

        __FB_UNIQUEID_PUSH__( stk )

        #print __FB_UNIQUEID__( stk )

        __FB_UNIQUEID_POP__( stk )

    #print __FB_UNIQUEID__( stk )

    __FB_UNIQUEID_POP__( stk )

#print __FB_UNIQUEID__( stk )

__FB_UNIQUEID_POP__( stk )

/' Compiler output example:

Lt_0006

Lt_0007

Lt_0008

Lt_0007

Lt_0006

'/

See also __FB_UNIQUEID_PUSH__ and __FB_UNIQUEID_POP__ examples.

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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.