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Make mrb_static_assert() a variable argument

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`mrb_static_assert()` extends the macro function to take one or two arguments.
If the argument is other than that, an error will occur.

References:
- static_assert のメッセージ省略を許可 - cpprefjp C++日本語リファレンス
  https://cpprefjp.github.io/lang/cpp17/extending_static_assert.html
- c - Overloading Macro on Number of Arguments - Stack Overflow
  https://stackoverflow.com/a/11763277
This commit is contained in:
dearblue
2021-10-24 23:11:52 +09:00
parent 7850549a5e
commit b774832ee1
7 changed files with 31 additions and 13 deletions
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include/mruby.h
+23 -5
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@@ -69,14 +69,18 @@
#define mrb_assert_int_fit(t1,n,t2,max) ((void)0)
#endif
#if (defined __cplusplus && __cplusplus >= 201103L) || \
#if (defined __cplusplus && __cplusplus >= 201703L)
# define mrb_static_assert(...) static_assert(__VA_ARGS__)
# define mrb_static_assert1(exp) static_assert(exp)
# define mrb_static_assert2(exp, str) static_assert(exp, str)
#elif (defined __cplusplus && __cplusplus >= 201103L) || \
(defined _MSC_VER) || \
(defined __GXX_EXPERIMENTAL_CXX0X__) /* for old G++/Clang++ */
# define mrb_static_assert(exp, str) static_assert(exp, str)
# define mrb_static_assert2(exp, str) static_assert(exp, str)
#elif defined __STDC_VERSION__ && \
((__STDC_VERSION__ >= 201112L) || \
(defined __GNUC__ && __GNUC__ * 100 + __GNUC_MINOR__ >= 406))
# define mrb_static_assert(exp, str) _Static_assert(exp, str)
# define mrb_static_assert2(exp, str) _Static_assert(exp, str)
#else
# /* alternative implementation of static_assert() */
# define _mrb_static_assert_cat0(a, b) a##b
@@ -86,10 +90,24 @@
# else
# define _mrb_static_assert_id(prefix) _mrb_static_assert_cat(prefix, __LINE__)
# endif
# define mrb_static_assert(exp, str) \
# define mrb_static_assert2(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)
#ifndef mrb_static_assert
# define mrb_static_assert1(exp) mrb_static_assert2(exp, #exp)
# define mrb_static_assert_expand(...) __VA_ARGS__ /* for MSVC behaviour - https://stackoverflow.com/q/5530505 */
# define mrb_static_assert_selector(a, b, name, ...) name
/**
* The `mrb_static_assert()` macro function takes one or two arguments.
*
* !!!c
* mrb_static_assert(expect_condition);
* mrb_static_assert(expect_condition, error_message);
*/
# define mrb_static_assert(...) \
mrb_static_assert_expand(mrb_static_assert_selector(__VA_ARGS__, mrb_static_assert2, mrb_static_assert1)(__VA_ARGS__))
#endif
#include "mrbconf.h"