Ok.php
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Ok.php
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	<?php

	namespace Keruald\OmniTools\DataTypes\Result;

	use InvalidArgumentException;

	use Keruald\OmniTools\Reflection\Type;

	class Ok extends Result {
	private mixed $value = null;

	private string $type = "NULL";

	public function __construct ($value = null) {
	if ($value !== null) {
	$this->setValue($value);
	}
	}

	public function isOK () : true {
	return true;
	}

	public function isError () : false {
	return false;
	}

	public function getValue () : mixed {
	return $this->value;
	}

	public function setValue (mixed $value) : void {
	$type = Type::getTypeOf($value);
	if (!$this->isAcceptableValueType($type)) {
	throw new InvalidArgumentException(<<<'EOD'
	When you mutate the value of an Ok object, you can't mutate the object type.
	Please consider return a new Ok instead.
	EOD
	);
	}

	$this->value = $value;
	$this->type = $type;
	}

	private function isAcceptableValueType (string $type) : bool {
	return $this->value === null \|\| $type === $this->type;
	}

	public function map (callable $callable) : self {
	$value = $callable($this->value);

	return new self($value);
	}

	public function mapErr (callable $callable) : self {
	return $this;
	}

	public function orElse (mixed $default) : mixed {
	return $this->value;
	}
	}