X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperltie.pod;h=3665f0420e57119c45182d1432eca7442dbb20ff;hb=3874323d73ef08e6639270ea07e834aec3e379f1;hp=adc557d71c4488f9c89cb49c7ebeb39cb4082bdc;hpb=58c2ef1935bc22d76403b75989b56de9eecb6730;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perltie.pod b/pod/perltie.pod
index adc557d..3665f04 100644
--- a/pod/perltie.pod
+++ b/pod/perltie.pod
@@ -258,7 +258,9 @@ index whose value we're trying to fetch.
 
 If a negative array index is used to read from an array, the index
 will be translated to a positive one internally by calling FETCHSIZE
-before being passed to FETCH.
+before being passed to FETCH.  You may disable this feature by
+assigning a true value to the variable C<$NEGATIVE_INDICES> in the
+tied array class.
 
 As you may have noticed, the name of the FETCH method (et al.) is the same
 for all accesses, even though the constructors differ in names (TIESCALAR
@@ -359,7 +361,7 @@ C<$self-E<gt>{ELEMSIZE}> spaces only, it does not exist:
 
 Delete the element at index I<key> from the tied array I<this>.
 
-In our example, a deleted item is C<$self->{ELEMSIZE}> spaces:
+In our example, a deleted item is C<$self-E<gt>{ELEMSIZE}> spaces:
 
     sub DELETE {
       my $self  = shift;
@@ -1074,6 +1076,14 @@ source code to MLDBM.
 Tied filehandles are still incomplete.  sysopen(), truncate(),
 flock(), fcntl(), stat() and -X can't currently be trapped.
 
+The bucket usage information provided by C<scalar(%hash)> is not
+available.  If C<%hash> is tied, this will currently result in a
+fatal error.
+
+Counting the number of entries in a hash via C<scalar(keys(%hash))> or
+C<scalar(values(%hash)>) is inefficient since it needs to iterate
+through all the entries with FIRSTKEY/NEXTKEY.
+
 =head1 AUTHOR
 
 Tom Christiansen