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.\" ========================================================================
.\"
.IX Title "accessors::classic 3pm"
.TH accessors::classic 3pm "2021-01-06" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
accessors::classic \- create 'classic' read/write accessor methods in caller's package.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  package Foo;
\&  use accessors::classic qw( foo bar baz );
\&
\&  my $obj = bless {}, \*(AqFoo\*(Aq;
\&
\&  # always return the current value, even on set:
\&  $obj\->foo( \*(Aqhello \*(Aq ) if $obj\->bar( \*(Aqworld\*(Aq ) eq \*(Aqworld\*(Aq;
\&
\&  print $obj\->foo, $obj\->bar, $obj\->baz( "!\en" );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBaccessors::classic\fR pragma lets you create simple \fIclassic\fR Perl
accessors at compile-time.
.PP
The generated methods look like this:
.PP
.Vb 5
\&  sub foo {
\&      my $self = shift;
\&      $self\->{foo} = shift if (@_);
\&      return $self\->{foo};
\&  }
.Ve
.PP
They \fIalways\fR return the current value.
.PP
Note that there is \fIno\fR dash (\f(CW\*(C`\-\*(C'\fR) prepended to the property name as there
are in accessors.  This is for backwards compatibility.
.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 \fI1\-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::ro,
accessors::chained,
base