50 lines
1,020 B
Perl
50 lines
1,020 B
Perl
package SelectSaver;
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our $VERSION = '1.01';
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=head1 NAME
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SelectSaver - save and restore selected file handle
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=head1 SYNOPSIS
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use SelectSaver;
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{
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my $saver = SelectSaver->new(FILEHANDLE);
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# FILEHANDLE is selected
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}
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# previous handle is selected
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{
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my $saver = SelectSaver->new;
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# new handle may be selected, or not
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}
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# previous handle is selected
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=head1 DESCRIPTION
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A C<SelectSaver> object contains a reference to the file handle that
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was selected when it was created. If its C<new> method gets an extra
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parameter, then that parameter is selected; otherwise, the selected
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file handle remains unchanged.
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When a C<SelectSaver> is destroyed, it re-selects the file handle
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that was selected when it was created.
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=cut
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sub new {
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@_ +>= 1 && @_ +<= 2 or die 'usage: SelectSaver->new([FILEHANDLE])';
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my $fh = select;
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my $self = bless \$fh, @_[0];
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select @_[1] if @_ +> 1;
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$self;
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}
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sub DESTROY {
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my $self = @_[0];
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select $$self;
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}
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1;
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