Defined(Foo, #PB_Macro) ?

[Little John]

Hi all,

I wanted to check, whether a macro is defined:

Code: Select all

CompilerIf Defined(Foo, #PB_Macro)
   Debug "Macro 'Foo' is already defined."
CompilerEndIf

But this does not work (tesed with PB 4.51 and PB 4.60 Beta 3).
Why is there no cnstant #PB_Macro for this purpose?
Is there any other possibility to check, whether a particular macro is defined?

Regards, Little John

[STARGÅTE]

You can not test in this way because the macro (the name) will replace already during the test.

Code: Select all

Macro Foo
 Debug 1
EndMacro

CompilerIf Defined(Foo, #PB_Macro)

CompilerEndIf

will be:

Code: Select all

Macro Foo
 Debug 1
EndMacro

CompilerIf Defined(Debug 1, #PB_Macro)
;[...]

[Fred]

That's it.

[Little John]

Hi, thank you for the explanation!

Maybe it is possible (and desirable) to change the compiler a little, so that it makes and exception in this case:
If a macro name is an argument of Defined(), then the compiler will not expand the macro.

Regards, Little John

[freak]

You can use a separate constant to guard against the double definition of a macro. Its not perfect, but it does the job for me:

Code: Select all

CompilerIf Defined(macro_test_defined, #PB_Constant) = 0
  #macro_test_defined = 1
  
  Macro test()
    ; something
  EndMacro
CompilerEndIf

[Little John]

That's a good idea, thank you!

Regards, Little John

[jacdelad]

Or the compiler could store the macro names in a map or list, so even if the are replaced it remembers they were there.

[Fred]

The whole line is evaluated before being parsed, so it wouldn't solve the issue.

[Olli]

Solve --> A homemade IDE tool set as pre-process, feature available since long time.

That is not very complex to do. Just the homemade feature would not be native nor public...

Just a remark : what's so bad with this code below ?

Code: Select all

Macro aa()
 Debug 11
EndMacro

UndefineMacro aa

Macro aa()
 Debug 13
EndMacro

aa()