Doug Gregor wrote:
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@statsoft.com> 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.
I haven't tried this, but how about the following(albeit not pretty): #include pragma_omp_parallel { #include pragma_omp_for for(int i = 1; i < size; ++i) x[i] = (y[i-1] + y[i+1])/2; } where the pragma_omp_* expand to file names whose contents contain #pragma omp ***? Just a thought. Jeff Flinn