---
name: "Types::Standard::Map"
section: "3pm"
platform: "linux"
package: "perl-type-tiny"
version: "2.010001-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Types::Standard::Map"
---

# Types::Standard::Map(3pm)

exporter utility for the Map type constraint

## NAME

Types::Standard::Map - exporter utility for the Map type constraint

## SYNOPSIS

```
  use Types::Standard -types;

  # Normal way to validate map.
  #
  Map->of( Int, Str )->assert_valid( { 1 => "one" } );

  use Types::Standard::Map IntsToStrs => { keys => Int, values => Str },

  # Exported shortcut
  #
  assert_IntsToStrs { 1 => "one" };
```

## STATUS

This module is not covered by the Type-Tiny stability policy.

## DESCRIPTION

This is mostly internal code, but can also act as an exporter utility.

### Exports

Types::Standard::Map can be used experimentally as an exporter.

```
  use Types::Standard 'Int';
  use Types::Standard::Map IntsToStrs => { keys => Int, values => Str },
```

This will export the following functions into your namespace:

- "IntsToStrs"

  - is\_IntsToStrs( $value )

  - assert\_IntsToStrs( $value )

  - to\_IntsToStrs( $value )

  Multiple types can be exported at once:

```
  use Types::Standard -types;
  use Types::Standard::Map (
    IntsToStrs  => { keys => Int, values => Str },
    StrsToInts  => { keys => Str, values => Int },
  );

  assert_StrsToInts { two => 2 };   # should not die
```

It's possible to further constrain the hashref using `"where"`:

```
  use Types::Standard::Dict MyThing => {
    keys   => Str->where( sub { ... } ),
    values => Int->where( sub { ... } ),
    where  => sub { ... },
  };
```

## BUGS

Please report any bugs to \<https://github.com/tobyink/p5-type-tiny/issues\>.

## SEE ALSO

Types::Standard.

## AUTHOR

Toby Inkster \<tobyink@cpan.org\>.

## COPYRIGHT AND LICENCE

This software is copyright (c) 2013-2025 by Toby Inkster.

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

## DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.