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Edit File : constexpr.h \| Size : 3.48 KB
#ifndef RBIMPL_ATTR_CONSTEXPR_H /--C++--vi:se ft=cpp:/ #define RBIMPL_ATTR_CONSTEXPR_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 #RBIMPL_ATTR_CONSTEXPR. / #include "ruby/internal/has/feature.h" #include "ruby/internal/compiler_is.h" #include "ruby/internal/token_paste.h" /* @cond INTERNAL_MACRO / #if ! defined(__cplusplus) # / Makes no sense. / # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0 # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0 #elif defined(__cpp_constexpr) # / https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations / # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cpp_constexpr >= 200704L) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cpp_constexpr >= 201304L) #elif RBIMPL_COMPILER_SINCE(MSVC, 19, 0, 0) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 RBIMPL_COMPILER_SINCE(MSVC, 19, 00, 00) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 RBIMPL_COMPILER_SINCE(MSVC, 19, 11, 00) #elif RBIMPL_COMPILER_SINCE(SunPro, 5, 13, 0) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L) #elif RBIMPL_COMPILER_SINCE(GCC, 4, 9, 0) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L) #elif RBIMPL_HAS_FEATURE(cxx_relaxed_constexpr) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1 # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 1 #elif RBIMPL_HAS_FEATURE(cxx_constexpr) # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1 # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0 #else # / :FIXME: icpc must have constexpr but don't know how to detect. / # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0 # define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0 #endif /* @endcond / /* Wraps (or simulates) C++11 `constexpr`. / #if RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 # define RBIMPL_ATTR_CONSTEXPR(_) constexpr #elif RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 # define RBIMPL_ATTR_CONSTEXPR(_) RBIMPL_TOKEN_PASTE(RBIMPL_ATTR_CONSTEXPR_, _) # define RBIMPL_ATTR_CONSTEXPR_CXX11 constexpr # define RBIMPL_ATTR_CONSTEXPR_CXX14 / void / #else # define RBIMPL_ATTR_CONSTEXPR(_) / void / #endif /* Enables #RBIMPL_ATTR_CONSTEXPR iff. ! #RUBY_DEBUG. / #if !RUBY_DEBUG # define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) RBIMPL_ATTR_CONSTEXPR(_) #else # define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) / void / #endif #endif / RBIMPL_ATTR_CONSTEXPR_H */ Back

Edit File : constexpr.h | Size : 3.48 KB

#ifndef RBIMPL_ATTR_CONSTEXPR_H                      /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ATTR_CONSTEXPR_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      #RBIMPL_ATTR_CONSTEXPR.
 */
#include "ruby/internal/has/feature.h"
#include "ruby/internal/compiler_is.h"
#include "ruby/internal/token_paste.h"

/** @cond INTERNAL_MACRO */
#if ! defined(__cplusplus)
# /* Makes no sense. */
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0

#elif defined(__cpp_constexpr)
# /* https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations */
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cpp_constexpr >= 200704L)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cpp_constexpr >= 201304L)

#elif RBIMPL_COMPILER_SINCE(MSVC, 19, 0, 0)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 RBIMPL_COMPILER_SINCE(MSVC, 19, 00, 00)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 RBIMPL_COMPILER_SINCE(MSVC, 19, 11, 00)

#elif RBIMPL_COMPILER_SINCE(SunPro, 5, 13, 0)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L)

#elif RBIMPL_COMPILER_SINCE(GCC, 4, 9, 0)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L)

#elif RBIMPL_HAS_FEATURE(cxx_relaxed_constexpr)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 1

#elif RBIMPL_HAS_FEATURE(cxx_constexpr)
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0

#else
# /* :FIXME: icpc must have constexpr but don't know how to detect. */
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0
# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0
#endif
/** @endcond */

/** Wraps (or simulates) C++11 `constexpr`.  */
#if RBIMPL_HAS_ATTR_CONSTEXPR_CXX14
# define RBIMPL_ATTR_CONSTEXPR(_) constexpr

#elif RBIMPL_HAS_ATTR_CONSTEXPR_CXX11
# define RBIMPL_ATTR_CONSTEXPR(_) RBIMPL_TOKEN_PASTE(RBIMPL_ATTR_CONSTEXPR_, _)
# define RBIMPL_ATTR_CONSTEXPR_CXX11 constexpr
# define RBIMPL_ATTR_CONSTEXPR_CXX14 /* void */

#else
# define RBIMPL_ATTR_CONSTEXPR(_) /* void */
#endif

/** Enables #RBIMPL_ATTR_CONSTEXPR iff. ! #RUBY_DEBUG. */
#if !RUBY_DEBUG
# define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) RBIMPL_ATTR_CONSTEXPR(_)
#else
# define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) /* void */
#endif

#endif /* RBIMPL_ATTR_CONSTEXPR_H */

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