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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Framework\Constraint;

/**
 * @psalm-template CallbackInput of mixed
 *
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 */
final class Callback extends Constraint
{
    /**
     * @psalm-var callable(CallbackInput $input): bool
     */
    private readonly mixed $callback;

/**
     * @psalm-param callable(CallbackInput $input): bool $callback
     */
    public function __construct(callable $callback)
    {
        $this->callback = $callback;
    }

/**
     * Returns a string representation of the constraint.
     */
    public function toString(): string
    {
        return 'is accepted by specified callback';
    }

/**
     * Evaluates the constraint for parameter $value. Returns true if the
     * constraint is met, false otherwise.
     *
     * @psalm-param CallbackInput $other
     */
    protected function matches(mixed $other): bool
    {
        return ($this->callback)($other);
    }
}

✏️ Editing: Callback.php

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