package SelectSaver; our $VERSION = '1.01'; =head1 NAME SelectSaver - save and restore selected file handle =head1 SYNOPSIS use SelectSaver; { my $saver = new SelectSaver(FILEHANDLE); # FILEHANDLE is selected } # previous handle is selected { my $saver = new SelectSaver; # new handle may be selected, or not } # previous handle is selected =head1 DESCRIPTION A C object contains a reference to the file handle that was selected when it was created. If its C method gets an extra parameter, then that parameter is selected; otherwise, the selected file handle remains unchanged. When a C 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: new SelectSaver [FILEHANDLE]'; my $fh = select; my $self = bless \$fh, $_[0]; select qualify($_[1], caller) if @_ > 1; $self; } sub DESTROY { my $self = $_[0]; select $$self; } 1;