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Allow mrb_static_assert() to be used outside of functions

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The use of `struct` is an idea by @dearblue.
This commit is contained in:
KOBAYASHI Shuji
2020-08-09 20:39:36 +09:00
parent df969b163a
commit 0d54568b4d
1 changed files with 9 additions and 3 deletions
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include/mruby.h
+9 -3
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@@ -68,9 +68,15 @@
# define mrb_static_assert(exp, str) static_assert(exp, str)
#else
/* C version of static_assert() */
# define mrb_static_assert(cond, str) \
do { int assertion_failed[(cond) ? 1 : -1];\
(void) assertion_failed; } while(0)
# define _mrb_static_assert_cat0(a, b) a##b
# define _mrb_static_assert_cat(a, b) _mrb_static_assert_cat0(a, b)
# ifdef __COUNTER__
# define _mrb_static_assert_id(prefix) _mrb_static_assert_cat(prefix, __COUNTER__)
# else
# define _mrb_static_assert_id(prefix) _mrb_static_assert_cat(prefix, __LINE__)
# endif
# define mrb_static_assert(exp, str) \
struct _mrb_static_assert_id(_mrb_static_assert_) { char x[(exp) ? 1 : -1]; }
#endif
#define mrb_static_assert1(exp) mrb_static_assert(exp, #exp)