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<?php declare(strict_types=1);
namespace Stratadox\PuzzleSolver\SearchStrategy;
use Stratadox\PuzzleSolver\Puzzle;
/**
* Iteration Limiter
*
* Iteration Limiter aborts the search when the amount of considered candidates
* exceeds a set limit.
* @author Stratadox
*/
final class IterationLimiter implements SearchStrategy
{
/** @var SearchStrategy */
private $strategy;
/** @var int */
private $limit;
private $current = 0;
private function __construct(SearchStrategy $strategy, int $limit)
$this->strategy = $strategy;
$this->limit = $limit;
}
public static function limitingTo(int $limit, SearchStrategy $strategy): self
return new self($strategy, $limit);
public function isOngoing(): bool
return $this->strategy->isOngoing();
public function consider(Puzzle $puzzle): bool
if (!$this->strategy->consider($puzzle)) {
return false;
if (++$this->current > $this->limit) {
throw OutOfIterations::exceeded($this->limit);
return true;
public function nextCandidate(): Puzzle
return $this->strategy->nextCandidate();
Stratadox /
PuzzleSolver
