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Edit File : maybe_unused.h \| Size : 1.89 KB
#ifndef RBIMPL_ATTR_MAYBE_UNUSED_H /--C++--vi:se ft=cpp:/ #define RBIMPL_ATTR_MAYBE_UNUSED_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_ATTR_MAYBE_UNUSED. / #include "ruby/internal/has/attribute.h" #include "ruby/internal/has/c_attribute.h" #include "ruby/internal/has/cpp_attribute.h" /* Wraps (or simulates) `[[maybe_unused]]` / #if RBIMPL_HAS_CPP_ATTRIBUTE(maybe_unused) # define RBIMPL_ATTR_MAYBE_UNUSED() [[maybe_unused]] #elif RBIMPL_HAS_C_ATTRIBUTE(maybe_unused) # define RBIMPL_ATTR_MAYBE_UNUSED() [[maybe_unused]] #elif RBIMPL_HAS_ATTRIBUTE(unused) # define RBIMPL_ATTR_MAYBE_UNUSED() __attribute__((__unused__)) #else # define RBIMPL_ATTR_MAYBE_UNUSED() / void / #endif #endif / RBIMPL_ATTR_MAYBE_UNUSED */ Back

Edit File : maybe_unused.h | Size : 1.89 KB

#ifndef RBIMPL_ATTR_MAYBE_UNUSED_H                   /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ATTR_MAYBE_UNUSED_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_ATTR_MAYBE_UNUSED.
 */
#include "ruby/internal/has/attribute.h"
#include "ruby/internal/has/c_attribute.h"
#include "ruby/internal/has/cpp_attribute.h"

/** Wraps  (or simulates)  `[[maybe_unused]]` */
#if RBIMPL_HAS_CPP_ATTRIBUTE(maybe_unused)
# define RBIMPL_ATTR_MAYBE_UNUSED() [[maybe_unused]]
#elif RBIMPL_HAS_C_ATTRIBUTE(maybe_unused)
# define RBIMPL_ATTR_MAYBE_UNUSED() [[maybe_unused]]
#elif RBIMPL_HAS_ATTRIBUTE(unused)
# define RBIMPL_ATTR_MAYBE_UNUSED() __attribute__((__unused__))
#else
# define RBIMPL_ATTR_MAYBE_UNUSED() /* void */
#endif

#endif /* RBIMPL_ATTR_MAYBE_UNUSED */

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