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.\" ========================================================================
.\"
.IX Title "accessors::ro 3pm"
.TH accessors::ro 3pm "2022-10-13" "perl v5.34.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
accessors::ro \- create 'classic' read\-only accessor methods in caller's package.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  package Foo;
\&  use accessors::ro qw( foo bar baz );
\&
\&  my $obj = bless { foo => \*(Aqread only? \*(Aq }, \*(AqFoo\*(Aq;
\&
\&  # values are read\-only, so set is disabled:
\&  print "oh my!\en" if $obj\->foo( "set?" ) eq \*(Aqread only? \*(Aq;
\&
\&  # if you really need to change the vars,
\&  # you must use direct\-variable\-access:
\&  $obj\->{bar} = \*(Aqi need a drink \*(Aq;
\&  $obj\->{baz} = \*(Aqnow\*(Aq;
\&
\&  # always returns the current value:
\&  print $obj\->foo, $obj\->bar, $obj\->baz, "!\en";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBaccessors::ro\fR pragma lets you create simple \fIclassic\fR read-only
accessors at compile-time.
.PP
The generated methods look like this:
.PP
.Vb 4
\&  sub foo {
\&      my $self = shift;
\&      return $self\->{foo};
\&  }
.Ve
.PP
They \fIalways\fR return the current value, just like accessors::ro.
.SH "PERFORMANCE"
.IX Header "PERFORMANCE"
There is \fBlittle-to-no performace hit\fR when using generated accessors; in
fact there is \fBusually a performance gain\fR.
.IP "\(bu" 4
typically \fI5\-15% faster\fR than hard-coded accessors (like the above example).
.IP "\(bu" 4
typically \fI0\-15% slower\fR than \fIoptimized\fR accessors (less readable).
.IP "\(bu" 4
typically a \fIsmall\fR performance hit at startup (accessors are created at
compile-time).
.IP "\(bu" 4
uses the same anonymous sub to reduce memory consumption (sometimes by 80%).
.PP
See the benchmark tests included with this distribution for more details.
.SH "CAVEATS"
.IX Header "CAVEATS"
Classes using blessed scalarrefs, arrayrefs, etc. are not supported for sake
of simplicity.  Only hashrefs are supported.
.SH "AUTHOR"
.IX Header "AUTHOR"
Steve Purkis <spurkis@cpan.org>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
accessors,
accessors::rw,
accessors::classic,
accessors::chained,
base