Data::Postponed::Once Data::Postponed::Once - delayed evaluation expressions are "collapsed" once observed.
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Data::Postponed::Once Tags

Perl module Expressions evaluation posponed evaluation expressions posponed expressions

Data::Postponed::Once Description

Data::Postponed::Once - delayed evaluation expressions are "collapsed" once observed. Data::Postponed::Once - delayed evaluation expressions are "collapsed" once observed. The value of expressions that have had postpone called on them are in flux until finalized. Once finalized, they are no longer overloaded.If you want to also prevent changes to input variables because you don't want to accidentally think you're reaching back in time when you're not, use Data::Postponed::OnceOnly.SYNOPSISExample using postpone_once() use Data::Postponed 'postpone_once'; %functions = ( foobar => 'foo' ); $code = "sub " . postpone_once( $functions{foobar} ) . " { return time }"; $functions{foobar} = "baz"; # Reflects the new name of 'bar' instead of 'foo'. $code isn't # overloaded anymore. print $code; # The change to $functions{foobar} is no longer reflected in $code $functions{foobar} = "quux"; print $code;Example using the OO use Data::Postponed; %functions = ( foobar => 'foo' ); $code = "sub " . Data::Postponed::Once->new( $functions{foobar} ) . " { return time }"; $functions{foobar} = "baz"; # Reflects the new name of 'bar' instead of 'foo'; print $code; # The change to $functions{foobar} is no longer reflected in $code $functions{foobar} = "quux"; print $code; Requirements: · Perl

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