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51 lines
2 KiB
C++
51 lines
2 KiB
C++
#ifndef RBIMPL_STDBOOL_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_STDBOOL_H
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/**
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* @file
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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 C99 shim for <stdbool.h>
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*/
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#include "ruby/internal/config.h"
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#if defined(__bool_true_false_are_defined)
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# /* Take that. */
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#elif defined(__cplusplus)
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# /* bool is a keyword in C++. */
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# if defined(HAVE_STDBOOL_H) && (__cplusplus >= 201103L)
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# include <cstdbool>
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# endif
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#
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# ifndef __bool_true_false_are_defined
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# define __bool_true_false_are_defined
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# endif
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#elif defined(HAVE_STDBOOL_H)
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# /* Take stdbool.h definition. */
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# include <stdbool.h>
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#elif !defined(HAVE__BOOL)
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typedef unsigned char _Bool;
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# /* See also http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2229.htm */
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# define bool _Bool
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# define true ((_Bool)+1)
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# define false ((_Bool)+0)
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# define __bool_true_false_are_defined
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#endif
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#endif /* RBIMPL_STDBOOL_H */
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