#include "ruby/internal/has/builtin.h"

Include dependency graph for constant_p.h:

This graph shows which files directly or indirectly include this file:

Macros
#define	RBIMPL_CONSTANT_P(expr) __builtin_constant_p(expr)
	Wraps (or simulates) `__builtin_constant_p` More...

Detailed Description

Author: Ruby developers ruby-.nosp@m.core.nosp@m.@ruby.nosp@m.-lan.nosp@m.g.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.

Note that __builtin_constant_p can be applicable inside of inline functions, according to GCC manual. Clang lacks that feature, though.

See also: https://bugs.llvm.org/show_bug.cgi?id=4898; https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html

Definition in file constant_p.h.

Macro Definition Documentation

#define RBIMPL_CONSTANT_P ( expr ) __builtin_constant_p(expr)

Wraps (or simulates) __builtin_constant_p

Definition at line 33 of file constant_p.h.