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Filename: //usr/share/perl/5.32/DirHandle.pm
package DirHandle; our $VERSION = '1.05'; =head1 NAME DirHandle - (obsolete) supply object methods for directory handles =head1 SYNOPSIS # recommended approach since Perl 5.6: do not use DirHandle if (opendir my $d, '.') { while (readdir $d) { something($_); } rewind $d; while (readdir $d) { something_else($_); } } # how you would use this module if you were going to use DirHandle; if (my $d = DirHandle->new(".")) { while (defined($_ = $d->read)) { something($_); } $d->rewind; while (defined($_ = $d->read)) { something_else($_); } } =head1 DESCRIPTION B<There is no reason to use this module nowadays.> The C<DirHandle> method provide an alternative interface to the opendir(), closedir(), readdir(), and rewinddir() functions. Up to Perl 5.5, opendir() could not autovivify a directory handle from C<undef>, so using a lexical handle required using a function from L<Symbol> to create an anonymous glob, which took a separate step. C<DirHandle> encapsulates this, which allowed cleaner code than opendir(). Since Perl 5.6, opendir() alone has been all you need for lexical handles. =cut require 5.000; use Carp; use Symbol; sub new { @_ >= 1 && @_ <= 2 or croak 'usage: DirHandle->new( [DIRNAME] )'; my $class = shift; my $dh = gensym; if (@_) { DirHandle::open($dh, $_[0]) or return undef; } bless $dh, $class; } sub DESTROY { my ($dh) = @_; # Don't warn about already being closed as it may have been closed # correctly, or maybe never opened at all. local($., $@, $!, $^E, $?); no warnings 'io'; closedir($dh); } sub open { @_ == 2 or croak 'usage: $dh->open(DIRNAME)'; my ($dh, $dirname) = @_; opendir($dh, $dirname); } sub close { @_ == 1 or croak 'usage: $dh->close()'; my ($dh) = @_; closedir($dh); } sub read { @_ == 1 or croak 'usage: $dh->read()'; my ($dh) = @_; readdir($dh); } sub rewind { @_ == 1 or croak 'usage: $dh->rewind()'; my ($dh) = @_; rewinddir($dh); } 1;
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