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Change the custom op registrations from two separate hashes to one hash
holding structure pointers, and add API functions to register ops and
look them up. This will make it easier to add new properties of custom
ops in the future. Copy entries across from the old hashes where
necessary, to preserve compatibility.
Add two new properties, in addition to the already-existing 'name' and
'description': 'class' and 'peep'. 'class' is one of the OA_*OP
constants, and allows B and other introspection mechanisms to work with
custom ops that aren't BASEOPs. 'peep' is a pointer to a function that
will be called for ops of this type from Perl_rpeep.
Adjust B.xs to take account of the new properties, and also to give
custom ops their registered name rather than simply 'custom'.
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All built-in functions that operate directly on array or hash
containers now also accept hard references to arrays or hashes:
|----------------------------+---------------------------|
| Traditional syntax | Terse syntax |
|----------------------------+---------------------------|
| push @$arrayref, @stuff | push $arrayref, @stuff |
| unshift @$arrayref, @stuff | unshift $arrayref, @stuff |
| pop @$arrayref | pop $arrayref |
| shift @$arrayref | shift $arrayref |
| splice @$arrayref, 0, 2 | splice $arrayref, 0, 2 |
| keys %$hashref | keys $hashref |
| keys @$arrayref | keys $arrayref |
| values %$hashref | values $hashref |
| values @$arrayref | values $arrayref |
| ($k,$v) = each %$hashref | ($k,$v) = each $hashref |
| ($k,$v) = each @$arrayref | ($k,$v) = each $arrayref |
|----------------------------+---------------------------|
This allows these built-in functions to act on long dereferencing
chains or on the return value of subroutines without needing to wrap
them in C<@{}> or C<%{}>:
push @{$obj->tags}, $new_tag; # old way
push $obj->tags, $new_tag; # new way
for ( keys %{$hoh->{genres}{artists}} ) {...} # old way
for ( keys $hoh->{genres}{artists} ) {...} # new way
For C<push>, C<unshift> and C<splice>, the reference will auto-vivify
if it is not defined, just as if it were wrapped with C<@{}>.
Calling C<keys> or C<values> directly on a reference gives a
substantial performance improvement over explicit dereferencing.
For C<keys>, C<values>, C<each>, when overloaded dereferencing is
present, the overloaded dereference is used instead of dereferencing
the underlying reftype. Warnings are issued about assumptions made in
the following three ambiguous cases:
(a) If both %{} and @{} overloading exists, %{} is used
(b) If %{} overloading exists on a blessed arrayref, %{} is used
(c) If @{} overloading exists on a blessed hashref, @{} is used
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