__FB_UNIQUEID_PUSH__
Intrinsic define (macro) performed by the compiler.
Syntax:
__FB_UNIQUEID_PUSH__( stack-id )
Parameters:
stack-id
the name of the stack to push
Description:
Pushes a new unique identifier on to a stack identified by stack-id (the size of the stack is increased by 1).
(__FB_UNIQUEID__ allows to get the identifier at the top of the stack, and __FB_UNIQUEID_POP__ allows to pop an identifier off of the stack)
Note:
At any time of its use, the number of __FB_UNIQUEID_POP__ applied from the beginning must always be less than or equal to the number of __FB_UNIQUEID_PUSH__ applied.
(__FB_UNIQUEID__ allows to get the identifier at the top of 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 fbc symbols of this form for any fbc program since version 0.0).
When such a stack is no longer in use, it is recommended that it be empty (at the end there must have been applied as many __FB_UNIQUEID_POP__ as __FB_UNIQUEID_PUSH__ for this stack).- 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 fbc symbols of this form for any fbc program since version 0.0).
At any time of its use, the number of __FB_UNIQUEID_POP__ applied from the beginning must always be less than or equal to the number of __FB_UNIQUEID_PUSH__ applied.
Examples:
See also __FB_UNIQUEID__ example.
See also __FB_UNIQUEID_POP__ example.
' As the "unique identifiers" (used as jump labels) are successively pushed on to a stack,
' the jump-code bodies must be defined in the reversed order than the jump calls.
#macro go
__FB_UNIQUEID_PUSH__( stk )
Goto __FB_UNIQUEID__( stk )
End If
#endmacro
#macro end_go
__FB_UNIQUEID__( stk ):
__FB_UNIQUEID_POP__( stk )
#endmacro
Dim As Integer N
Do
Input "Enter a value between 1 and 4 (0 or empty input for exit) ? ", N
If N = 0 Then go
If N = 1 Then go
If N = 2 Then go
If N = 3 Then go
If N = 4 Then go
Continue Do
end_go
Print "You entered 4" : Continue Do
end_go
Print "You entered 3" : Continue Do
end_go
Print "You entered 2" : Continue Do
end_go
Print "You entered 1" : Continue Do
end_go
Print "End" : Exit Do
Loop
Sleep
' the jump-code bodies must be defined in the reversed order than the jump calls.
#macro go
__FB_UNIQUEID_PUSH__( stk )
Goto __FB_UNIQUEID__( stk )
End If
#endmacro
#macro end_go
__FB_UNIQUEID__( stk ):
__FB_UNIQUEID_POP__( stk )
#endmacro
Dim As Integer N
Do
Input "Enter a value between 1 and 4 (0 or empty input for exit) ? ", N
If N = 0 Then go
If N = 1 Then go
If N = 2 Then go
If N = 3 Then go
If N = 4 Then go
Continue Do
end_go
Print "You entered 4" : Continue Do
end_go
Print "You entered 3" : Continue Do
end_go
Print "You entered 2" : Continue Do
end_go
Print "You entered 1" : Continue Do
end_go
Print "End" : Exit Do
Loop
Sleep
See also __FB_UNIQUEID_POP__ example.
Version:
- Since fbc 1.08.0
Differences from QB:
- New to FreeBASIC
See also:
Back to Intrinsic Defines
