mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
38 lines
1.9 KiB
C++
38 lines
1.9 KiB
C++
#ifndef RUBY3_ATTR_MAYBE_UNUSED_H /*-*-C++-*-vi:se ft=cpp:*/
|
|
#define RUBY3_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 `RUBY3` or `ruby3` 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 #RUBY3_ATTR_MAYBE_UNUSED.
|
|
*/
|
|
#include "ruby/impl/has/attribute.h"
|
|
#include "ruby/impl/has/c_attribute.h"
|
|
#include "ruby/impl/has/cpp_attribute.h"
|
|
|
|
/** Wraps (or simulates) `[[maybe_unused]]` */
|
|
#if RUBY3_HAS_CPP_ATTRIBUTE(maybe_unused)
|
|
# define RUBY3_ATTR_MAYBE_UNUSED() [[maybe_unused]]
|
|
#elif RUBY3_HAS_C_ATTRIBUTE(maybe_unused)
|
|
# define RUBY3_ATTR_MAYBE_UNUSED() [[maybe_unused]]
|
|
#elif RUBY3_HAS_ATTRIBUTE(unused)
|
|
# define RUBY3_ATTR_MAYBE_UNUSED() __attribute__((__unused__))
|
|
#else
|
|
# define RUBY3_ATTR_MAYBE_UNUSED() /* void */
|
|
#endif
|
|
|
|
#endif /* RUBY3_ATTR_MAYBE_UNUSED */
|