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<?php
/**
* This file deals with RAII style scoped callbacks.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Class for asserting that a callback happens when an dummy object leaves scope
*
* @since 1.21
*/
class ScopedCallback {
/** @var callable */
protected $callback;
/**
* @param callable $callback
* @throws Exception
*/
public function __construct( $callback ) {
if ( !is_callable( $callback ) ) {
throw new InvalidArgumentException( "Provided callback is not valid." );
}
$this->callback = $callback;
}
/**
* Trigger a scoped callback and destroy it.
* This is the same is just setting it to null.
*
* @param ScopedCallback $sc
*/
public static function consume( ScopedCallback &$sc = null ) {
$sc = null;
}
/**
* Destroy a scoped callback without triggering it
*
* @param ScopedCallback $sc
*/
public static function cancel( ScopedCallback &$sc = null ) {
if ( $sc ) {
$sc->callback = null;
}
$sc = null;
}
/**
* Trigger the callback when this leaves scope
*/
function __destruct() {
if ( $this->callback !== null ) {
call_user_func( $this->callback );
}
}
}
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