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[cairoint.h] Add COMPILE_TIME_ASSERT()

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Behdad Esfahbod 2008-05-28 13:09:52 -04:00
parent 043ed895ad
commit 2e4d6acd09
1 changed files with 4 additions and 0 deletions
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4
src/cairoint.h
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@ -127,6 +127,10 @@ do { \
static const int NOT_REACHED = 0; \
assert (NOT_REACHED); \
} while (0)
#define COMPILE_TIME_ASSERT1(condition, line) \
typedef int compile_time_assertion_at_line_##line##_failed [(condition)?1:-1];
#define COMPILE_TIME_ASSERT0(condition, line) COMPILE_TIME_ASSERT1(condition, line)
#define COMPILE_TIME_ASSERT(condition) COMPILE_TIME_ASSERT0(condition, __LINE__)
#define CAIRO_ALPHA_IS_OPAQUE(alpha) ((alpha) >= ((double)0xff00 / (double)0xffff))
#define CAIRO_ALPHA_SHORT_IS_OPAQUE(alpha) ((alpha) >= 0xff00)