---
name: "accessors::ro"
section: "3pm"
platform: "linux"
package: "libaccessors-perl"
version: "1.01-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/accessors::ro"
---

# accessors::ro(3pm)

create 'classic' read-only accessor methods in caller's package.

## NAME

accessors::ro - create 'classic' read-only accessor methods in caller's package.

## SYNOPSIS

```
  package Foo;
  use accessors::ro qw( foo bar baz );
  my $obj = bless { foo => 'read only? ' }, 'Foo';
  # values are read-only, so set is disabled:
  print "oh my!\n" if $obj->foo( "set?" ) eq 'read only? ';
  # if you really need to change the vars,
  # you must use direct-variable-access:
  $obj->{bar} = 'i need a drink ';
  $obj->{baz} = 'now';
  # always returns the current value:
  print $obj->foo, $obj->bar, $obj->baz, "!\n";
```

## DESCRIPTION

The **accessors::ro** pragma lets you create simple *classic* read-only accessors at compile-time.

The generated methods look like this:

```
  sub foo {
      my $self = shift;
      return $self->{foo};
  }
```

They *always* return the current value, just like accessors::ro.

## PERFORMANCE

There is **little-to-no performace hit** when using generated accessors; in fact there is **usually a performance gain**.

- •

  typically *5-15% faster* than hard-coded accessors (like the above example).

- •

  typically *0-15% slower* than *optimized* accessors (less readable).

- •

  typically a *small* performance hit at startup (accessors are created at compile-time).

- •

  uses the same anonymous sub to reduce memory consumption (sometimes by 80%).

See the benchmark tests included with this distribution for more details.

## CAVEATS

Classes using blessed scalarrefs, arrayrefs, etc. are not supported for sake of simplicity.  Only hashrefs are supported.

## AUTHOR

Steve Purkis \<spurkis@cpan.org\>

## SEE ALSO

accessors, accessors::rw, accessors::classic, accessors::chained, base