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usr/share/perl5/SelectSaver.pm 0000644 00000002064 15051127422 0012265 0 ustar 00 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;