Assert that `MRB_METHOD_CACHE_SIZE` is a power of 2
The `mrb_static_assert_powerof2()` macro has been introduced for this purpose.
mrb_static_assert_expand(mrb_static_assert_selector(__VA_ARGS__, mrb_static_assert2, mrb_static_assert1, _)(__VA_ARGS__))
#endif
+#define mrb_static_assert_powerof2(num) mrb_static_assert((num) > 0 && (num) == ((num) & -(num)), "need power of 2 for " #num)
+
#include "mrbconf.h"
#include <mruby/common.h>
@@ -208,6 +210,7 @@ struct mrb_context {
#ifdef MRB_METHOD_CACHE_SIZE
# undef MRB_NO_METHOD_CACHE
+mrb_static_assert_powerof2(MRB_METHOD_CACHE_SIZE);
#else
/* default method cache size: 256 */
/* cache size needs to be power of 2 */
