mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
9e41a75255
To fix build failures.
45 lines
2.2 KiB
C++
45 lines
2.2 KiB
C++
#ifndef RBIMPL_ATTR_NODISCARD_H /*-*-C++-*-vi:se ft=cpp:*/
|
|
#define RBIMPL_ATTR_NODISCARD_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_NODISCARD.
|
|
*/
|
|
#include "ruby/internal/has/attribute.h"
|
|
#include "ruby/internal/has/c_attribute.h"
|
|
#include "ruby/internal/has/cpp_attribute.h"
|
|
|
|
/**
|
|
* Wraps (or simulates) `[[nodiscard]]`. In C++ (at least since C++20) a
|
|
* nodiscard attribute can have a message why the result shall not be ignoed.
|
|
* However GCC attribute and SAL annotation cannot take them.
|
|
*/
|
|
#if RBIMPL_HAS_CPP_ATTRIBUTE(nodiscard)
|
|
# define RBIMPL_ATTR_NODISCARD() [[nodiscard]]
|
|
#elif RBIMPL_HAS_C_ATTRIBUTE(nodiscard)
|
|
# define RBIMPL_ATTR_NODISCARD() [[nodiscard]]
|
|
#elif RBIMPL_HAS_ATTRIBUTE(warn_unused_result)
|
|
# define RBIMPL_ATTR_NODISCARD() __attribute__((__warn_unused_result__))
|
|
#elif defined(_Check_return_)
|
|
# /* Take SAL definition. */
|
|
# define RBIMPL_ATTR_NODISCARD() _Check_return_
|
|
#else
|
|
# define RBIMPL_ATTR_NODISCARD() /* void */
|
|
#endif
|
|
|
|
#endif /* RBIMPL_ATTR_NODISCARD_H */
|