/**
* UID by Grant Skinner. Dec 5, 2010
* Visit www.gskinner.com/blog for documentation, updates and more free code.
*
*
* Copyright (c) 2010 Grant Skinner
* 
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
* 
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
**/

(function(window) {
	
// constructor:
	/**
	* The UID class uses a static interface (ex. UID.get()) and should not be instantiated.
	* @class Global utility for generating sequential unique ID numbers.
	**/
	function UID() {
		throw "UID cannot be instantiated"; 
	}
	
// private static properties:
	/** @private **/
	UID._nextID = 0;
	
	/**
	* Returns the next unique id.
	* @static
	**/
	UID.get = function() {
		return UID._nextID++;
	}

window.UID = UID;
}(window));