Current File : //opt/alt/ruby31/include/ruby/internal/constant_p.h
#ifndef RBIMPL_CONSTANT_P_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_CONSTANT_P_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_CONSTANT_P.
*
* Note that __builtin_constant_p can be applicable inside of inline functions,
* according to GCC manual. Clang lacks that feature, though.
*
* @see https://bugs.llvm.org/show_bug.cgi?id=4898
* @see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
*/
#include "ruby/internal/has/builtin.h"
/** Wraps (or simulates) `__builtin_constant_p` */
#if RBIMPL_HAS_BUILTIN(__builtin_constant_p)
# define RBIMPL_CONSTANT_P(expr) __builtin_constant_p(expr)
#else
# define RBIMPL_CONSTANT_P(expr) 0
#endif
#endif /* RBIMPL_CONSTANT_P_H */
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