Ruby: include/ruby/backward/2/stdarg.h File Reference

Ruby 4.0.6p0 (2026-07-14 revision 03b6d3f8898a28604fe6cb00eae3226b821168f4)

Macros
stdarg.h File Reference

Defines old _. More...

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## Macros
#define | _(args)
| This was a transition path from K&R to ANSI.
#define | __(args)
| This was a transition path from K&R to ANSI.
#define | ANYARGS ...
| Functions declared using this macro take arbitrary arguments, including void.

## Detailed Description

Defines old _.

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.

Nobody should ever use these macros any longer. No known compilers lack prototypes today. It's 21st century. Just forget them.

Definition in file stdarg.h.

## Macro Definition Documentation

## ◆ _

#define _ | ( |  | args | ) |

Value:
()

This was a transition path from K&R to ANSI.

Deprecated
  Nobody practically needs this macro any longer.

Definition at line 35 of file stdarg.h.

Referenced by rb_proc_times().

## ◆ __

#define __ | ( |  | args | ) |

Value:
()

This was a transition path from K&R to ANSI.

Deprecated
  Nobody practically needs this macro any longer.

Definition at line 46 of file stdarg.h.

## ◆ ANYARGS

#define ANYARGS ...

Functions declared using this macro take arbitrary arguments, including void.

void func(ANYARGS);
ANYARGS
#define ANYARGS
Functions declared using this macro take arbitrary arguments, including void.
Definition stdarg.h:64

This was a necessary evil when there was no such thing like function overloading. But it is the 21st century today. People generally need not use this. Just use a granular typed function.

See also
  ruby::backward::cxxanyargs

Definition at line 64 of file stdarg.h.

Referenced by rb_class_descendants(), rb_define_global_function(), rb_define_method(), rb_define_method_id(), rb_define_module_function(), rb_define_private_method(), rb_define_protected_method(), and rb_define_singleton_method().