Ruby: include/ruby/internal/constant_p.h File Reference

Ruby 3.3.4p94 (2024-07-09 revision be1089c8ec5ba40e09b1553e36b3174bf4014d9d)

Macros
constant_p.h File Reference

Defines RBIMPL_CONSTANT_P. More...

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

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## Macros
#define | RBIMPL_CONSTANT_P(expr) 0
| Wraps (or simulates) `__builtin_constant_p`

## Detailed Description

Defines RBIMPL_CONSTANT_P.

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

## ◆ RBIMPL_CONSTANT_P

#define RBIMPL_CONSTANT_P | ( |  | expr | ) | 0

Wraps (or simulates) `__builtin_constant_p`

Definition at line 35 of file constant_p.h.

Referenced by RB_TYPE_P().