<!-- GENERATED by docs/sphinx/bin/02-reference from PDL/Types.rs. Do not edit. -->

```{index} single: PDL::Types; Perl module
```

# PDL::Types

```{pperl-module-badges} PDL::Types
```

##  Synopsis

    use PDL::Types;
    my $type = PDL::Type->new(6);   # double
    print $type->symbol, "\n";      # PDL_D
    print $type->realctype, "\n";   # double
    my $a = zeroes(double, 10);

Mirrors `PDL::Types.pm`: exports type-name subs (e.g. `byte`, `double`) that
return PDL type codes, plus uppercase aliases (`PDL_B`, `PDL_D`, etc.).
Type codes match `PdlDatatype` discriminant values exactly.

## Functions

### Other Functions

#### `type_stringify`

`PDL::Type` stringification: returns lowercase type name. `PDL::Type` is bless [`$enum`], '`PDL::Type`'.

#### `type_new`

`PDL::Type`->`new($code_or_name)` — constructor. Handles: `new($class, $code)`, `new($class, "double")`, `new($class, $existing_type)`. If the argument is already a `PDL::Type` blessed ref, pass it through.

#### `types_list`

PDL::Types::types() — return the list of all registered `PDL::Type` objects, ordered by numval. Mirrors `PDL::Types.pm`: my `@CACHED_TYPES` = map `bless([$_->{numval}, $_], 'PDL::Type')`, `@HASHES`; sub types { `@CACHED_TYPES` } Heavily used by `Test::PDL` (line 417) to iterate over available types when building per-type comparison subs; without it, every upstream test that `use`s `Test::PDL` fails at compile time.

#### `type_eq`

`PDL::Type` eq comparison — stringify both sides and compare

#### `type_ne`

`PDL::Type` ne comparison

#### `type_spaceship`

`PDL::Type` <=> numeric comparison by enum/numval. Mirrors upstream `PDL::Types.pm:578`: "<=>" => sub { `$_`[2] ? `$_`[1][0] <=> `$_`[0][0] : `$_`[0][0] <=> `$_`[1][0] }, where `$_[2]` is the swap flag.

#### `type_cmp`

`PDL::Type` cmp string comparison. Mirrors `Types.pm:575-577`.

#### `type_nomethod`

`PDL::Type` overload marker (nomethod)

#### `type_numify`

`PDL::Type` numification (0+) — returns the type code integer

#### `type_howbig`

`PDL::Type::howbig` — returns byte size of the type.

#### `type_enum`

`enum($type)` — numval, the slot-0 integer. `Types.pm:531`.

#### `type_badvalue`

`PDL::Type::badvalue` — get or set the bad value for the type.

#### `type_orig_badvalue`

`PDL::Type::orig_badvalue` — returns the ORIGINAL (hardcoded) bad value, ignoring any user-set override. Mirrors `Bad.pd`'s _default_badvalue_int (`pdl.h`'s PDL_BADVAL_* constants). Note: this is NOT the same as xs_type_badvalue, which reflects mutations made via `byte->badvalue($v)`.

#### `type_codederef`

`PDL::Type` &{} overload — allows calling a `PDL::Type` as a code reference. `byte->()` returns 'byte' (the type name string).