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

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

Stu, you are the best, thanks!

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

-dandaman32

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