None.php
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None.php
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	<?php

	declare(strict_types=1);

	namespace Phan\Library;

	use Exception;

	/**
	* This represents the absence of a value in an Option.
	*
	* @inherits Option<null>
	* @phan-pure
	*/
	final class None extends Option
	{
	/**
	* Get a new instance of nothing
	*/
	private function __construct()
	{
	}

	/** @var None */
	private static $instance;

	/**
	* Fetches the shared instance of None.
	*/
	public static function instance(): None
	{
	return self::$instance;
	}

	public function isDefined(): bool
	{
	return false;
	}

	/**
	* @template E
	* @param E $else
	* @return E
	* @suppress PhanParamSignatureMismatch
	*/
	public function getOrElse($else)
	{
	return $else;
	}

	/**
	* @return never
	* @throws Exception to indicate that get() was called without checking for a value.
	*/
	public function get()
	{
	throw new Exception("Cannot call get on None");
	}

	/**
	* @return string
	* A string representation of this object
	*/
	public function __tostring(): string
	{
	return 'None()';
	}

	/**
	* Called automatically to instantiate shared instance
	* @internal
	*/
	public static function init(): void
	{
	self::$instance = new None();
	}
	}
	None::init();