NAME

B::Hooks::OP::Check::StashChange - Invoke callbacks when the stash code is being compiled in changes

SYNOPSIS
From Perl

package Foo;

use B::Hooks::OP::Check::StashChange;

        our $id = B::Hooks::OP::Check::StashChange::register(sub {
            my ($new, $old) = @_;
            warn "${old} -> ${new}";
        });

        package Bar; # "Foo -> Bar"

        B::Hooks::OP::Check::StashChange::unregister($Foo::id);

        package Moo; # callback not invoked

From C/XS

#include "hooks_op_check_stashchange.h"

        STATIC OP *
        my_callback (pTHX_ OP *op, char *new_stash, char *old_stash, void user_data) {
            / ... */
            return op;
        }

        UV id;

        /* register callback */
        id = hook_op_check_stashchange (cv, my_callback, NULL);

        /* unregister */
        hook_op_check_stashchange_remove (id);

DESCRIPTION
Perl API
register

B::Hooks::OP::Check::

        # or
        my $id = B::Hooks::OP::Check::StashChange::register(\&callback);

Register "callback" when an opcode is being compiled in a different namespace than the previous one.

An id that can be used for later removal of the handler using "unregister" is returned.

unregister

B::Hooks::OP::Check::StashChange::unregister($id);

Disable the callback referenced by $id.

C API
TYPES
OP *(*hook_op_check_stashchange_cb) (pTHX_ OP *op, const char *new_stash, const char *old_stash, void *user_data) The type the callbacks need to implement.

FUNCTIONS
UV hook_op_check_stashchange (hook_op_check_stashchange_cb cb, void *user_data) Register the callback "cb" to be when an opcode is compiled in a different namespace than the previous. "user_data" will be passed to the callback as the last argument.

Returns an id that can be used to remove the handler using "hook_op_check_stashchange_remove".

void *hook_op_check_stashchange_remove (UV id) Remove a previously registered handler referred to by "id".

Returns the user data that was associated with the handler.

SEE ALSO

B::Hooks::OP::Check

AUTHOR

Florian Ragwitz <rafl@debian.org>

COPYRIGHT AND LICENSE

Copyright (c) 2008 Florian Ragwitz

This module is free software.

You may distribute this code under the same terms as Perl itself.