1accessors::ro(3)      User Contributed Perl Documentation     accessors::ro(3)
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NAME

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

10         package Foo;
11         use accessors::ro qw( foo bar baz );
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13         my $obj = bless { foo => 'read only? ' }, 'Foo';
14
15         # values are read-only, so set is disabled:
16         print "oh my!\n" if $obj->foo( "set?" ) eq 'read only? ';
17
18         # if you really need to change the vars,
19         # you must use direct-variable-access:
20         $obj->{bar} = 'i need a drink ';
21         $obj->{baz} = 'now';
22
23         # always returns the current value:
24         print $obj->foo, $obj->bar, $obj->baz, "!\n";
25

DESCRIPTION

27       The accessors::ro pragma lets you create simple classic read-only
28       accessors at compile-time.
29
30       The generated methods look like this:
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32         sub foo {
33             my $self = shift;
34             return $self->{foo};
35         }
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37       They always return the current value, just like accessors::ro.
38

PERFORMANCE

40       There is little-to-no performace hit when using generated accessors; in
41       fact there is usually a performance gain.
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43       ·   typically 5-15% faster than hard-coded accessors (like the above
44           example).
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46       ·   typically 0-15% slower than optimized accessors (less readable).
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48       ·   typically a small performance hit at startup (accessors are created
49           at compile-time).
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51       ·   uses the same anonymous sub to reduce memory consumption (sometimes
52           by 80%).
53
54       See the benchmark tests included with this distribution for more
55       details.
56

CAVEATS

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

62       Steve Purkis <spurkis@cpan.org>
63

SEE ALSO

65       accessors, accessors::rw, accessors::classic, accessors::chained, base
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69perl v5.30.0                      2019-07-26                  accessors::ro(3)
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