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

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