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(VERIFY): Guard definition with #ifndef.

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(VERIFY_EXPR): Undef before defining.
This commit is contained in:
Jim Meyering
2005-06-30 16:40:59 +00:00
parent 36835110b6
commit a9129f0786
1 changed files with 8 additions and 5 deletions
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src/system.h
+8 -5
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@@ -812,15 +812,18 @@ ptr_align (void const *ptr, size_t alignment)
return (void *) (p1 - (size_t) p1 % alignment);
}
#define GL_CONCAT0(x, y) x##y
#define GL_CONCAT(x, y) GL_CONCAT0 (x, y)
#ifndef VERIFY
# define GL_CONCAT0(x, y) x##y
# define GL_CONCAT(x, y) GL_CONCAT0 (x, y)
/* Verify a requirement at compile-time (unlike assert, which is runtime). */
#define VERIFY(assertion) \
struct GL_CONCAT (compile_time_assert_, __LINE__) \
{ char a[(assertion) ? 1 : -1]; }
# define VERIFY(assertion) \
struct GL_CONCAT (compile_time_assert_, __LINE__) \
{ char a[(assertion) ? 1 : -1]; }
#endif
/* Like the above, but use an expression rather than a struct declaration.
This macro may be used in some contexts where the other may not. */
#undef VERIFY_EXPR
#define VERIFY_EXPR(assertion) \
(void)((struct {char a[(assertion) ? 1 : -1]; } *) 0)