Ruby: include/ruby/internal/arithmetic/size_t.h File Reference

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

Macros
size_t.h File Reference

Arithmetic conversion between C's size_t and Ruby's. More...

`#include "ruby/internal/config.h"`
`#include "ruby/internal/arithmetic/int.h"`
`#include "ruby/internal/arithmetic/long.h"`
`#include "ruby/internal/arithmetic/long_long.h"`
`#include "ruby/backward/2/long_long.h"`

Go to the source code of this file.

## Macros
#define | RB_SIZE2NUM RB_ULONG2NUM
| Converts a C's size_t into an instance of rb_cInteger.
#define | RB_SSIZE2NUM RB_LONG2NUM
| Converts a C's ssize_t into an instance of rb_cInteger.
#define | RB_NUM2SIZE RB_NUM2ULONG
| Converts an instance of rb_cInteger into C's size_t.
#define | RB_NUM2SSIZE RB_NUM2LONG
| Converts an instance of rb_cInteger into C's ssize_t.
#define | NUM2SIZET RB_NUM2SIZE
| Old name of RB_NUM2SIZE.
#define | SIZET2NUM RB_SIZE2NUM
| Old name of RB_SIZE2NUM.
#define | NUM2SSIZET RB_NUM2SSIZE
| Old name of RB_NUM2SSIZE.
#define | SSIZET2NUM RB_SSIZE2NUM
| Old name of RB_SSIZE2NUM.

## Detailed Description

Arithmetic conversion between C's size_t and Ruby's.

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.

Definition in file size_t.h.

## Macro Definition Documentation

## ◆ RB_NUM2SIZE

#define RB_NUM2SIZE RB_NUM2ULONG

Converts an instance of rb_cInteger into C's size_t.

Definition at line 47 of file size_t.h.

Referenced by rb_fiber_scheduler_io_result_apply().

## ◆ RB_NUM2SSIZE

#define RB_NUM2SSIZE RB_NUM2LONG

Converts an instance of rb_cInteger into C's ssize_t.

Definition at line 49 of file size_t.h.

## ◆ RB_SIZE2NUM

#define RB_SIZE2NUM RB_ULONG2NUM

Converts a C's size_t into an instance of rb_cInteger.

Definition at line 31 of file size_t.h.

Referenced by rb_fiber_scheduler_io_result().

## ◆ RB_SSIZE2NUM

#define RB_SSIZE2NUM RB_LONG2NUM

Converts a C's ssize_t into an instance of rb_cInteger.

Definition at line 33 of file size_t.h.