Result.php

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<?php

declare(strict_types=1);

namespace ILIAS\Data;

interface Result
{
    public function isOK(): bool;

    public function value();

    public function isError(): bool;

    public function error();

    public function valueOr($default);

    public function map(callable $f): Result;

    public function then(callable $f): Result;

    public function except(callable $f): Result;
}