在#define中使用openmp编译指示 [英] Using an openmp pragma inside #define

问题描述

可能的重复项:
定义宏中的C/C ++编译指示
有条件的"pragma omp"

Possible Duplicates:
C/C++ pragma in define macro
Conditional “pragma omp”

如何在宏定义中使用OpenMP编译指示?例如

How can I use an OpenMP pragmas inside a macro definition? E.g.

#define A() { \
 ...a lot of code... \
 #pragma omp for     \
 for(..)             \
  ..do_for..         \
 ...another a lot of code \
 }

推荐答案

有条件的"pragma omp"

C99具有_Pragma关键字，该关键字使您可以将#pragma放在宏中.像

C99 has the _Pragma keyword that allows you to place what otherwise would be #pragma inside macros. Something like

  #define OMP_PARA_INTERNAL _Pragma("omp parallel for")

所以

#define OMP_PARA_FOR _Pragma("omp for")
#define A() { \
 ...a lot of code... \
 OMP_PARA_FOR     \
 for(..)             \
  ..do_for..         \
 ...another a lot of code \
 }

几个_Pragma可以组合为一元运算符，例如:

several _Pragmas can be combined as unary operator, e.g.:

_Pragma("first pragma") _Pragma("Second pragma")

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