perl 5.000perl-5.000

[editor's note: this commit combines approximate 4 months of furious
releases of Andy Dougherty and Larry Wall - see pod/perlhist.pod for
details.  Andy notes that;
 
Alas neither my "Irwin AccuTrack" nor my DC 600A quarter-inch cartridge 
backup tapes from that era seem to be readable anymore.  I guess 13 years 
exceeds the shelf life for that backup technology :-(.
]

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/TieHash.pm b/lib/TieHash.pm
new file mode 100644
index 0000000000..0cb4afa20d
--- /dev/null
+++ b/lib/TieHash.pm
@@ -0,0 +1,42 @@
+package TieHash;
+use Carp;
+
+sub new {
+    my $pack = shift;
+    $pack->TIEHASH(@_);
+}
+
+# Grandfather "new"
+
+sub TIEHASH {
+    my $pack = shift;
+    if (defined &{"{$pack}::new"}) {
+	carp "WARNING: calling ${pack}->new since ${pack}->TIEHASH is missing"
+	    if $^W;
+	$pack->new(@_);
+    }
+    else {
+	croak "$pack doesn't define a TIEHASH method";
+    }
+}
+
+sub EXISTS {
+    my $pack = ref $_[0];
+    croak "$pack doesn't define an EXISTS method";
+}
+
+sub CLEAR {
+    my $self = shift;
+    my $key = $self->FIRSTKEY(@_);
+    my @keys;
+
+    while (defined $key) {
+	push @keys, $key;
+	$key = $self->NEXTKEY(@_, $key);
+    }
+    foreach $key (@keys) {
+	$self->DELETE(@_, $key);
+    }
+}
+
+1;