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