MikeSchinkel
25th December 2005 03:08 UTC

validate macro parameters at compile time?
Is it possible to validate macro parameters at compile time? IOW, is there something like an "!ifequal" command and I just can't find it?

Here's an example showing what I'm looking for given the hypothetical !isequal command:

!macro foo _stmt _var1 _op _var2
   !define _uid {__LINE__}
   !ifequal _op "=" Continue${_uid}
   !ifequal _op "<>" Continue${_uid}
   !ifequal _op ">" Continue${_uid}
   !ifequal _op "<" Continue${_uid}
   !error "3rd param must be be one of: =, <>, <, or >."

Continue${_uid}:

   ...do work here

   !undef _uid {__LINE__}
!macroend

Afrow UK
25th December 2005 10:55 UTC

I wasn't able to find the topic which has the solution to this, but here is what you do.

!macro A_Macro Param
 !define "Check_${Param}"
 !ifdef Check_Hello
  # do something here
 !else
  # ...
 !endif
 !undef "Check_${Param}"
!macroend

This would check if the user passed "Hello".

-Stu

MikeSchinkel
25th December 2005 18:33 UTC

Stu, you are the best, thanks!

dandaman32
25th December 2005 22:12 UTC

I never tried this, but can symbol names have spaces?

-dandaman32

deguix
26th December 2005 13:33 UTC

Yes, if you put quotes around them. Their usage in instructions is weird though: you don't need to put quotes around the ${symbol w/ spaces}:

OutFile Test.exe

!define "AB CD" 1234

Section
  MessageBox MB_OK ${AB CD}
SectionEnd