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#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/internal/has/extension.h"
#include "ruby/internal/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) \
MAYBE_UNUSED(typedef int static_assert_ ## name ## _check[1 - 2 * !(expr)])
#endif
#endif /* RBIMPL_STATIC_ASSERT_H */
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