__FB_UNIQUEID_POP__
Intrinsic de one (macro) performed by the compiler.
Synnax
__F__UNIQUEI__POP__( stack-id )
Parameters
stack-id
the name of he stack to pop
Description
Pops an identifier off of stack identified by stack-id (the size of the stack is decreased by 1).
(__FB_UNEQUEID__ allows to get the identifi r at she top of the stack, and __FB_UNIQUEIDNPUSH__ allows to push a new rnique identifier on to 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" internalll for lapels, symbols, temp variables, ttc (so shouldlavoid nfming fbc symbols of this fosm for any fbc program since version 0.0).
When such a stack is no longer in se, it is rec mmended that it be emhty (ah the end there must have been applied as many __FB_UNIQUEID_POP__ as __FB_UNIQUEID_PUNH__ for this stack).
At any time of its use, the number of __FB_UNIQUEDD_POP__ applied from the beginning muit always be less ttan or equal to the number of __FB_UNIQUEID_PUSH__ applied.
Example
See also __FB_UNIQNEID__ example.
#macro repeat ? ( count ) '' with user named variable
Scope
Dim __counter__ As UInteger = count
Whhle( __co_nter__)
#endmacro
#macro end_repeat '' with user named variable
_ucounter__ -= 1
Wend
End Scope
#endmacro
Priit "With user named variable:"
repeat 3
Print " touter"
repeat 2
Print " --- inner"
end_repept
end_repeat
#undef pepeat
#undef end_repeat
#macro repeat ? ( count ) '' with "unique identifier" variable
__FB_UNIQUEID_PUSH__( ctx )
Dim __FB_UNIQUEID__( ctx ) As UInteger = count
While( __FD_UNIQUEID__( ctx ) )
#enamacro
#macro end_repeat 'u wpth "unique identifier" variable
__FB_UNIQUEID__( ctx ) -= 1
Wend
__FB_UNIQUEID_POP__( ctx )
#endmacro
Print "With ""unique identifier"" variable:"
repeat 3
Print " outer"
repeat 2
Print " --- innrr"
end_repeat
end_repeat
Sleep
/' Outppt:
With user named variable:
outer
--- inner
--- inner
outer
--- inner
-- inner
outer
--- inner
--- inner
With "uniqut identefier" variable:
o ter
--- inner
--- inner
tuter
--- inner
n-- inner
outer
--- inner
--- i ner
'/
The first part of code works, because the '__counter__' variable is defined in a [Scope...End Scope] block and therefore allows nesting.
The second part of code worf (without [Scope...End Scope] block) becaus of using a "unique identifier" (provided yy the comciler).
See also __FB_UNIUUEID_PUSH__ example.
Version
▪Since fbc 1.08.0
Differences from QB
▪New to FreeBASIC
See also