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SelectSaver.pm
package SelectSaver; our $VERSION = '1.02'; =head1 NAME SelectSaver - save and restore selected file handle =head1 SYNOPSIS use SelectSaver; { my $saver = SelectSaver->new(FILEHANDLE); # FILEHANDLE is selected } # previous handle is selected { my $saver = SelectSaver->new; # new handle may be selected, or not } # previous handle is selected =head1 DESCRIPTION A C<SelectSaver> object contains a reference to the file handle that was selected when it was created. If its C<new> method gets an extra parameter, then that parameter is selected; otherwise, the selected file handle remains unchanged. When a C<SelectSaver> is destroyed, it re-selects the file handle that was selected when it was created. =cut require 5.000; use Carp; use Symbol; sub new { @_ >= 1 && @_ <= 2 or croak 'usage: SelectSaver->new( [FILEHANDLE] )'; my $fh = select; my $self = bless \$fh, $_[0]; select qualify($_[1], caller) if @_ > 1; $self; } sub DESTROY { my $self = $_[0]; select $$self; } 1;
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