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Man Pages


Manual Reference Pages  -  ACCESSORS::RO (3)

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NAME

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

CONTENTS

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 <B>accessors::roB> 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 <B>little-to-no performace hitB> when using generated accessors; in fact there is <B>usually a performance gainB>.
o typically 5-15% faster than hard-coded accessors (like the above example).
o typically 0-15% slower than optimized accessors (less readable).
o typically a small performance hit at startup (accessors are created at compile-time).
o 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
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perl v5.20.3 ACCESSORS::RO (3) 2016-03-17

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