/*
 * Verrückte Turing-Maschinen — A turing complete game
 * Copyright (C) 2016 Christian Fraß <vidofnir@folksprak.org>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

/**
 * @author kcf <vidofnir@folksprak.org>
 */
interface schnittstelle_fehlermonade<typ_wert>
	{
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		ist_schlicht() : boolean;
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		lesen() : typ_wert;
		
	}


/**
 * @author kcf <vidofnir@folksprak.org>
 */
class klasse_nichts<typ_wert>
	implements schnittstelle_fehlermonade<typ_wert>
	{
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		public constructor()
			{
				
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		public ist_schlicht() : boolean
			{
				return false;
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		public lesen() : typ_wert
			{
				let meldung : string = "ist nichts";
				throw (new Error(meldung));
			}
		
	}


/**
 * @author kcf <vidofnir@folksprak.org>
 */
class klasse_schlicht<typ_wert>
	implements schnittstelle_fehlermonade<typ_wert>
	{
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		private wert : typ_wert;
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		public constructor(wert : typ_wert)
			{
				this.wert = wert;
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		public ist_schlicht() : boolean
			{
				return true;
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		public lesen() : typ_wert
			{
				return this.wert;
			}
		
	}