//implementation of state object
//the state acts with a backbone of an unordered set
//it references values via a stringifyed name of themselves, and allows them
//to be retrieved in O(1) time

var State = (function(){
	function State(){

	}
	//stores the element via string key of itself
	State.prototype.insert = function(elem){
		this[JSON.stringify(elem)] = elem;
	};
	//checks if element is in the state
	State.prototype.check = function(elem){
		return JSON.stringify(elem) in this;
	};
	State.prototype.del = function(elem){
		delete this[JSON.stringify(elem)];
	};
	return State;
})();

/*   var a = new State();
   a
=> {}
   a.insert({foo:5})
   a
=> { '{"foo":5}': { foo: 5 } }
   a.check({foo:5})
=> true
   a.insert({foo:true})
   a.insert({foo:true})
   a
=> { '{"foo":5}': { foo: 5 }, '{"foo":true}': { foo: true } }*/