diff options
Diffstat (limited to 'pod/perldelta.pod')
| -rw-r--r-- | pod/perldelta.pod | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/pod/perldelta.pod b/pod/perldelta.pod index cf6036ff02..958bee38ed 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -27,7 +27,7 @@ might have symbol conflicts if you embed Perl in another application, just as in the 5.003 release. By default, binary compatibility is preserved at the expense of symbol table pollution. -=head2 Subroutine Parameters Are Not Autovivified +=head2 No Autovivification of Subroutine Parameters In Perl versions 5.002 and 5.003, array and hash elements used as subroutine parameters were "autovivified"; that is, they were brought @@ -47,6 +47,13 @@ fixed. As a result, the string "$$0" is no longer equivalent to C<$$."0">, but rather to C<${$0}>. To get the old behavior, change "$$" followed by a digit to "${$}". +=head2 No Resetting of $. on Implicit Close + +The documentation for Perl 5.0 has always stated that C<$.> is I<not> +reset when an already-open file handle is re-opened with no intervening +call to C<close>. Due to a bug, perl versions 5.000 through 5.0003 +I<did> reset C<$.> under that circumstance; Perl 5.004 does not. + =head2 Changes to Tainting Checks A bug in previous versions may have failed to detect some insecure @@ -64,6 +71,15 @@ application of opcode masks. The revised Safe module has a new API and is implemented using the new Opcode module. Please read the new Opcode and Safe documentation. +=head2 Embedding Improvements + +In older versions of Perl it was not possible to create more than one +Perl interpreter instance inside a single process without leaking like a +sieve and/or crashing. The bugs that caused this behavior have all been +fixed. However, you still must take care when embedding Perl in a C +program. See the updated perlembed manpage for tips on how to manage +your interpreters. + =head2 Internal Change: FileHandle Class Based on IO::* Classes File handles are now stored internally as type IO::Handle. The @@ -124,8 +140,8 @@ This now works. (e.g. C<delete @ENV{'PATH', 'MANPATH'}>) =item flock -is now supported on more platforms, and prefers fcntl -to lockf when emulating. +is now supported on more platforms, prefers fcntl to lockf when +emulating, and always flushes before (un)locking. =item printf and sprintf @@ -283,7 +299,7 @@ are inherited by all other classes: =item isa(CLASS) -C<isa> returns I<true> if its object is blessed into a sub-class of C<CLASS> +C<isa> returns I<true> if its object is blessed into a subclass of C<CLASS> C<isa> is also exportable and can be called as a sub with two arguments. This allows the ability to check what a reference points to. Example: @@ -459,7 +475,7 @@ a fixed value are now inlined (e.g. C<sub PI () { 3.14159 }>). Each unique hash key is only allocated once, no matter how many hashes have an entry with that key. So even if you have 100 copies of the -same hash, the hash keys never have to be re-allocated. +same hash, the hash keys never have to be reallocated. =head1 Pragmata |