Result.php

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<?php
 
declare(strict_types=1);
 
/* Copyright (c) 2017 Richard Klees <richard.klees@concepts-and-training.de> Extended GPL, see docs/LICENSE */
 
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;
}