Ruby  3.4.0dev (2024-11-05 revision 348a53415339076afc4a02fcd09f3ae36e9c4c61)
Macros
stdarg.h File Reference

(348a53415339076afc4a02fcd09f3ae36e9c4c61)

Defines old _. More...

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Macros

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

Detailed Description

Defines old _.

Author
Ruby developers ruby-.nosp@m.core.nosp@m.@ruby.nosp@m.-lan.nosp@m.g.org
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)    ()

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.

◆ __

#define __ (   args)    ()

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);
#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.