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From: AeroSpace Ed on 25 Oct 2006 09:27
Tobias Schlemmer wrote:

> AeroSpace Ed schrieb:
>> Elijah Cardon wrote:
>>
>>> One of the reasons that I use #define in c is that it mimics what might
>>> happen if a caller were passing what is being #defined. Is there such a
>>> thing as a preprocessor in fortran? EC
>
>> This doesn't make any sense to me. What EXACTLY are you using the
>> #defined
>> directive for? Many Fortran compilers can pre-process cpp statements.
>
> One interesteing application of #define is IMHO the C/C++ macro assert,
> which assures a given expression. In the failure case it will stop your
> program and output the current filename and line number together with
> the test to stderr.
>
> One problem I have with g95:
> The macro expansion very often exeeds the
>
>> However, your described use doesn't make any sense to me.
> Using autoconf is a very useful example.
>
> or e. g.
>
> #ifdef DEBUG
> #define pure
> #endif
>
> That enables you to have some debug output in otherwise pure functions
> if you are familiar with the side effects.
>
> Tobias

I'm not sure this explains to me how Elijah is using #define.

Ed
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