/ 
B-Hooks-OP-Check-StashChange-0.01
River stage zero No dependents
/ B::Hooks::OP::Check::StashChange

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.