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50 lines
2.3 KiB
C++
50 lines
2.3 KiB
C++
#ifndef RBIMPL_CAST_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_CAST_H
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/**
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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_CAST.
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*
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* This casting macro makes sense only inside of other macros that are part of
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* public headers. They could be used from C++, and C-style casts could issue
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* warnings. Ruby internals are pure C so they should not bother.
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*/
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#include "ruby/internal/compiler_since.h"
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#include "ruby/internal/has/warning.h"
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#include "ruby/internal/warning_push.h"
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#if ! defined(__cplusplus)
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# define RBIMPL_CAST(expr) (expr)
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#elif RBIMPL_COMPILER_SINCE(GCC, 4, 6, 0)
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# /* g++ has -Wold-style-cast since 1997 or so, but its _Pragma is broken. */
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# /* See https://gcc.godbolt.org/z/XWhU6J */
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# define RBIMPL_CAST(expr) (expr)
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# pragma GCC diagnostic ignored "-Wold-style-cast"
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#elif RBIMPL_HAS_WARNING("-Wold-style-cast")
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# define RBIMPL_CAST(expr) \
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RBIMPL_WARNING_PUSH() \
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RBIMPL_WARNING_IGNORED(-Wold-style-cast) \
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(expr) \
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RBIMPL_WARNING_POP()
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#else
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# define RBIMPL_CAST(expr) (expr)
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#endif
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#endif /* RBIMPL_CAST_H */
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