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Diffstat (limited to 'include/ruby/internal/static_assert.h')
| -rw-r--r-- | include/ruby/internal/static_assert.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/include/ruby/internal/static_assert.h b/include/ruby/internal/static_assert.h new file mode 100644 index 0000000000..e7788ab31a --- /dev/null +++ b/include/ruby/internal/static_assert.h @@ -0,0 +1,77 @@ +#ifndef RBIMPL_STATIC_ASSERT_H /*-*-C++-*-vi:se ft=cpp:*/ +#define RBIMPL_STATIC_ASSERT_H +/** + * @file + * @author Ruby developers <ruby-core@ruby-lang.org> + * @copyright This file is a part of the programming language Ruby. + * Permission is hereby granted, to either redistribute and/or + * modify this file, provided that the conditions mentioned in the + * file COPYING are met. Consult the file for details. + * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are + * implementation details. Don't take them as canon. They could + * rapidly appear then vanish. The name (path) of this header file + * is also an implementation detail. Do not expect it to persist + * at the place it is now. Developers are free to move it anywhere + * anytime at will. + * @note To ruby-core: remember that this header can be possibly + * recursively included from extension libraries written in C++. + * Do not expect for instance `__VA_ARGS__` is always available. + * We assume C99 for ruby itself but we don't assume languages of + * extension libraries. They could be written in C++98. + * @brief Defines #RBIMPL_STATIC_ASSERT. + */ +#include <assert.h> +#include "ruby/impl/has/extension.h" +#include "ruby/impl/compiler_since.h" + +/** @cond INTERNAL_MACRO */ +#if defined(__cplusplus) && defined(__cpp_static_assert) +# /* https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations */ +# define RBIMPL_STATIC_ASSERT0 static_assert + +#elif defined(__cplusplus) && RBIMPL_COMPILER_SINCE(MSVC, 16, 0, 0) +# define RBIMPL_STATIC_ASSERT0 static_assert + +#elif defined(__INTEL_CXX11_MODE__) +# define RBIMPL_STATIC_ASSERT0 static_assert + +#elif defined(__cplusplus) && __cplusplus >= 201103L +# define RBIMPL_STATIC_ASSERT0 static_assert + +#elif defined(__cplusplus) && RBIMPL_HAS_EXTENSION(cxx_static_assert) +# define RBIMPL_STATIC_ASSERT0 __extension__ static_assert + +#elif defined(__GXX_EXPERIMENTAL_CXX0X__) && __GXX_EXPERIMENTAL_CXX0X__ +# define RBIMPL_STATIC_ASSERT0 __extension__ static_assert + +#elif defined(__STDC_VERSION__) && RBIMPL_HAS_EXTENSION(c_static_assert) +# define RBIMPL_STATIC_ASSERT0 __extension__ _Static_assert + +#elif defined(__STDC_VERSION__) && RBIMPL_COMPILER_SINCE(GCC, 4, 6, 0) +# define RBIMPL_STATIC_ASSERT0 __extension__ _Static_assert + +#elif defined(static_assert) +# /* Take <assert.h> definition */ +# define RBIMPL_STATIC_ASSERT0 static_assert +#endif +/** @endcond */ + +/** + * @brief Wraps (or simulates) `static_assert` + * @param name Valid C/C++ identifier, describing the assertion. + * @param expr Expression to assert. + * @note `name` shall not be a string literal. + */ +#if defined(__DOXYGEN__) +# define RBIMPL_STATIC_ASSERT static_assert + +#elif defined(RBIMPL_STATIC_ASSERT0) +# define RBIMPL_STATIC_ASSERT(name, expr) \ + RBIMPL_STATIC_ASSERT0(expr, # name ": " # expr) + +#else +# define RBIMPL_STATIC_ASSERT(name, expr) \ + typedef int static_assert_ ## name ## _check[1 - 2 * !(expr)] +#endif + +#endif /* RBIMPL_STATIC_ASSERT_H */ |