---
name: "YAML::PP::Schema::Tie::IxHash"
section: "3pm"
platform: "linux"
package: "perl-yaml-pp"
version: "0.43.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/YAML::PP::Schema::Tie::IxHash"
---

# YAML::PP::Schema::Tie::IxHash(3pm)

(Deprecated) Schema for serializing ordered hashes

## NAME

YAML::PP::Schema::Tie::IxHash - (Deprecated) Schema for serializing ordered hashes

## SYNOPSIS

```
    use YAML::PP;
    use Tie::IxHash;
    my $yp = YAML::PP->new( schema => [qw/ + Tie::IxHash /] );
    tie(my %ordered, 'Tie::IxHash');
    %ordered = (
        U => 2,
        B => 52,
    );
    my $yaml = $yp->dump_string(\%ordered);
    # Output:
    ---
    U: 2
    B: 52
```

## DESCRIPTION

This is deprecated. See the new option `"preserve"` in YAML::PP.

This schema allows you to dump ordered hashes which are tied to Tie::IxHash.

This code is pretty new and experimental.

It is not yet implemented for loading yet, so for now you have to tie the hashes yourself.

Examples:

- order

  ```
          # Code
          tie(my %order, 'Tie::IxHash');
          %order = (
              U => 2,
              B => 52,
              c => 64,
              19 => 84,
              Disco => 2000,
              Year => 2525,
              days_on_earth => 20_000,
          );
          \%order;
          # YAML
          ---
          U: 2
          B: 52
          c: 64
          19: 84
          Disco: 2000
          Year: 2525
          days_on_earth: 20000
  ```

- order\_blessed

  ```
          # Code
          tie(my %order, 'Tie::IxHash');
          %order = (
              U => 2,
              B => 52,
              c => 64,
              19 => 84,
              Disco => 2000,
              Year => 2525,
              days_on_earth => 20_000,
          );
          bless \%order, 'Order';
          # YAML
          --- !perl/hash:Order
          U: 2
          B: 52
          c: 64
          19: 84
          Disco: 2000
          Year: 2525
          days_on_earth: 20000
  ```

## METHODS

- register

  Called by YAML::PP::Schema