Result.php

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<?php
/* Copyright (c) 2017 Richard Klees <richard.klees@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\Data;

interface Result
{
    public function isOK();

    public function value();

    public function isError();

    public function error();

    public function valueOr($default);

    public function map(callable $f);

    public function then(callable $f);

    public function except(callable $f);
}