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Diffstat (limited to 'pod/perldelta.pod')
| -rw-r--r-- | pod/perldelta.pod | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/pod/perldelta.pod b/pod/perldelta.pod index b06fc7a408..58ba2c0747 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -28,6 +28,15 @@ here, but most should go in the L</Performance Enhancements> section. [ List each enhancement as a =head2 entry ] +=head2 Views + +Views are almost-transparent references. Using a view is almost like using +the view's target. However, if a view is read-only (and most are), attempts +to modify the target through the view will fail. + +This feature has been introduced to allow efficient and safe passing of +parameters by value. + =head2 C<splice()> doesn't warn when truncating You can now limit the size of an array using C<splice(@a,MAX_LEN)> without @@ -458,6 +467,25 @@ when a hash is freed that has had its current iterator deleted =back +=head API Changes + +=head2 New type SVt_VIEW for views; replaces SVt_BIND + +A new type C<SVt_VIEW> has been added in support of L<views>. This type is +a renaming of C<SVt_BIND>. Because the name C<SVt_BIND> was never given any +semantic nor could ever be created or destroyed, it has been removed. + +=head2 Most API macros and functions follow views + +For backward compatibility and convenience, most Perl API macros and +functions follow views transparently; e.g. if C<sv> is a view, then +C<SvTYPE(sv)> is not C<SVt_VIEW>, but the type of the view's target. + +=head2 View-aware features added to API + +New macros and functions have been added to support examination of views, +e.g. C<SvVTYPE(sv)> of a view is C<SVt_VIEW>. + =head1 Known Problems XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any |