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.\" ========================================================================
.\"
.IX Title "B::Hooks::OP::Check 3"
.TH B::Hooks::OP::Check 3 "2017-07-31" "perl v5.26.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
B::Hooks::OP::Check \- Wrap OP check callbacks
.SH "VERSION"
.IX Header "VERSION"
version 0.22
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    # include "hook_op_check.h"
\&
\&    STATIC OP *my_const_check_op (pTHX_ OP *op, void *user_data) {
\&        /* ... */
\&        return op;
\&    }
\&
\&    STATIC hook_op_check_id my_hook_id = 0;
\&
\&    void
\&    setup ()
\&        CODE:
\&            my_hook_id = hook_op_check (OP_CONST, my_const_check_op, NULL);
\&
\&    void
\&    teardown ()
\&        CODE:
\&            hook_op_check_remove (OP_CONST, my_hook_id);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides a C \s-1API\s0 for \s-1XS\s0 modules to hook into the callbacks of
\&\f(CW\*(C`PL_check\*(C'\fR.
.PP
ExtUtils::Depends is used to export all functions for other \s-1XS\s0 modules to
use. Include the following in your Makefile.PL:
.PP
.Vb 5
\&    my $pkg = ExtUtils::Depends\->new(\*(AqYour::XSModule\*(Aq, \*(AqB::Hooks::OP::Check\*(Aq);
\&    WriteMakefile(
\&        ... # your normal makefile flags
\&        $pkg\->get_makefile_vars,
\&    );
.Ve
.PP
Your \s-1XS\s0 module can now include \f(CW\*(C`hook_op_check.h\*(C'\fR.
.SH "TYPES"
.IX Header "TYPES"
.SS "typedef \s-1OP\s0 *(*hook_op_check_cb) (pTHX_ \s-1OP\s0 *, void *);"
.IX Subsection "typedef OP *(*hook_op_check_cb) (pTHX_ OP *, void *);"
Type that callbacks need to implement.
.SS "typedef \s-1UV\s0 hook_op_check_id"
.IX Subsection "typedef UV hook_op_check_id"
Type to identify a callback.
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
.SS "hook_op_check_id hook_op_check (opcode type, hook_op_check_cb cb, void *user_data)"
.IX Subsection "hook_op_check_id hook_op_check (opcode type, hook_op_check_cb cb, void *user_data)"
Register the callback \f(CW\*(C`cb\*(C'\fR to be called after the \f(CW\*(C`PL_check\*(C'\fR function for
opcodes of the given \f(CW\*(C`type\*(C'\fR. \f(CW\*(C`user_data\*(C'\fR will be passed to the callback as
the last argument. Returns an id that can be used to remove the callback later
on.
.SS "void *hook_op_check_remove (opcode type, hook_op_check_id id)"
.IX Subsection "void *hook_op_check_remove (opcode type, hook_op_check_id id)"
Remove the callback identified by \f(CW\*(C`id\*(C'\fR. Returns the user_data that the callback had.
.SH "SUPPORT"
.IX Header "SUPPORT"
Bugs may be submitted through the \s-1RT\s0 bug tracker <https://rt.cpan.org/Public/Dist/Display.html?Name=B-Hooks-OP-Check>
(or bug\-B\-Hooks\-OP\-Check@rt.cpan.org <mailto:bug-B-Hooks-OP-Check@rt.cpan.org>).
.SH "AUTHOR"
.IX Header "AUTHOR"
Florian Ragwitz <rafl@debian.org>
.SH "CONTRIBUTORS"
.IX Header "CONTRIBUTORS"
.IP "\(bu" 4
Karen Etheridge <ether@cpan.org>
.IP "\(bu" 4
Zefram <zefram@fysh.org>
.IP "\(bu" 4
Alexandr Ciornii <alexchorny@gmail.com>
.SH "COPYRIGHT AND LICENCE"
.IX Header "COPYRIGHT AND LICENCE"
This software is copyright (c) 2008 by Florian Ragwitz.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.