---
name: "FFI::C::Union"
section: "3pm"
platform: "linux"
package: "libffi-c-perl"
version: "0.15-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/FFI::C::Union"
---

# FFI::C::Union(3pm)

Union data instance for FFI

## NAME

FFI::C::Union - Union data instance for FFI

## VERSION

version 0.15

## SYNOPSIS

```
 use FFI::C::UnionDef;

 my $def = FFI::C::UnionDef->new(
   name => 'anyint_t',
   class => 'AnyInt',
   members => [
     u8  => 'uint8',
     u16 => 'uint16',
     u32 => 'uint32',
   ],
 );

 my $int = AnyInt->new({ u8 => 42 });
 printf "0x%x\n", $int->u32;   # 0x2a on Intel
```

## DESCRIPTION

This class represents an instance of a C `"union"`.  This class can be created using `"new"` on the generated class, if that was specified for the FFI::C::UnionDef, or by using the `"create"` method on FFI::C::UnionDef.

For each member defined in the FFI::C::UnionDef there is an accessor for the FFI::C::Union instance.

## CONSTRUCTOR

### new

```
 FFI::C::UnionDef->new( class => 'User::Union::Class', ... );
 my $instance = User::Union::Class->new;
```

Creates a new instance of the `"union"`.

## SEE ALSO

- FFI::C

  - FFI::C::Array

  - FFI::C::ArrayDef

  - FFI::C::Def

  - FFI::C::File

  - FFI::C::PosixFile

  - FFI::C::Struct

  - FFI::C::StructDef

  - FFI::C::Union

  - FFI::C::UnionDef

  - FFI::C::Util

  - FFI::Platypus::Record

  ## AUTHOR

Graham Ollis \<plicease@cpan.org\>

## COPYRIGHT AND LICENSE

This software is copyright (c) 2020-2022 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.