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From: Doug Gregor (dgregor_at_[hidden])
Date: 2008-04-03 09:27:35

On Apr 3, 2008, at 8:36 AM, Jeff Flinn wrote:

> Giovanni Piero Deretta wrote:
>> On Wed, Apr 2, 2008 at 11:37 PM, Stephen Nuchia
>> <snuchia_at_[hidden]> wrote:
>>>> Does #ifdef around #pragma omp indeed work? At least
>>>> #define PARALLEL #pragma omp
>>>> and using PARALLEL does not work.
>>> I think the above may clash with either the definition or an
>>> implementation of #pragma; I can't recall ever successfully using a
>>> macro that expands to any directive. But that could be because I
>>> haven't tried it in the last twenty years :-)
>> I do not think that there is any way for a macro to expand to a
>> directive.
> You may want to pose that question to Paul Mensonides. He may have a
> way
> to get the desired effect with Boost::PP.

C99 has _Pragma; otherwise, it isn't possible.

        - Doug

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