static_assert.h

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#ifndef ION_PORT_STATIC_ASSERT_H_
#define ION_PORT_STATIC_ASSERT_H_



#if (LANG_CXX11 || _MSC_VER >= 1600) && !defined(ION_PLATFORM_NACL)
#define ION_PORT_STATIC_ASSERT(expr, message) static_assert(expr, message)


#else

#define ION__STATIC_ASSERT_CAT0(a, b) a ## b
#define ION__STATIC_ASSERT_CAT1(a, b) ION__STATIC_ASSERT_CAT0(a, b)


#if __GNUC__
# define ION_ATTRIBUTE_UNUSED __attribute__((unused))
#else
# define ION_ATTRIBUTE_UNUSED
#endif

#define ION_PORT_STATIC_ASSERT(expr, message)                                  \
  typedef int ION__STATIC_ASSERT_CAT1(static_assert_failed_at_line, __LINE__)[ \
      static_cast<bool>(expr) ? 1 : -1] ION_ATTRIBUTE_UNUSED


#endif

#endif  // ION_PORT_STATIC_ASSERT_H_