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--- title: StaticAssert --- See <http://www.pixelbeat.org/programming/gcc/static_assert.html> #define ASSERT\_CONCAT\_(a, b) a##b #define ASSERT\_CONCAT(a, b) ASSERT\_CONCAT_(a, b) /* These can't be used after statements in c89. */ #ifdef \_\_COUNTER\_\_ #define STATIC_ASSERT(e,m) \ { enum { ASSERT_CONCAT(static\_assert\_, \_\_COUNTER\_\_) = 1/(!!(e)) }; } #else /* This can't be used twice on the same line so ensure if using in headers * that the headers are not included twice (by wrapping in #ifndef...#endif) * Note it doesn't cause an issue when used on same line of separate modules * compiled with gcc -combine -fwhole-program. */ #define STATIC_ASSERT(e,m) \ { enum { ASSERT_CONCAT(assert\_line\_, \_\_LINE\_\_) = 1/(!!(e)) }; } #endif [1]: StaticAssert?action=sourceblock&num=1 <!-- vim: filetype=markdown -->
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