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Commit 0d54568b authored by KOBAYASHI Shuji's avatar KOBAYASHI Shuji
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Allow `mrb_static_assert()` to be used outside of functions 

The use of `struct` is an idea by @dearblue.
parent df969b16
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Showing with 9 additions and 3 deletions
include/mruby.h
View file @ 0d54568b
...@@ -68,9 +68,15 @@ ...@@ -68,9 +68,15 @@
# define mrb_static_assert(exp, str) static_assert(exp, str) # define mrb_static_assert(exp, str) static_assert(exp, str)
#else #else
/* C version of static_assert() */ /* C version of static_assert() */
# define mrb_static_assert(cond, str) \ # define _mrb_static_assert_cat0(a, b) a##b
do { int assertion_failed[(cond) ? 1 : -1];\ # define _mrb_static_assert_cat(a, b) _mrb_static_assert_cat0(a, b)
(void) assertion_failed; } while(0) # 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 #endif
#define mrb_static_assert1(exp) mrb_static_assert(exp, #exp) #define mrb_static_assert1(exp) mrb_static_assert(exp, #exp)
......
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