Enum extension methods

EnumExtensions.cs

#region [Copyright (c) 2015 Cristian Alexandru Geambasu]
//	Distributed under the terms of an MIT-style license:
//
//	The MIT License
//
//	Copyright (c) 2015 Cristian Alexandru Geambasu
//
//	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 
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#endregion
using UnityEngine;
using System;
using System.Collections;

namespace TeamUtility
{
	public static class EnumExtensions
	{
		public static bool Has<T> (this System.Enum type, T value)
		{
			try {
				return (((int)(object)type & (int)(object)value) == (int)(object)value);
			} 
			catch {
				return false;
			}
		}

		public static bool Is<T> (this System.Enum type, T value)
		{
			try {
				return (int)(object)type == (int)(object)value;
			} 
			catch {
				return false;
			}    
		}

		public static T Add<T> (this System.Enum type, T value)
		{
			try {
				return (T)(object)(((int)(object)type | (int)(object)value));
			} 
			catch (Exception ex) {
				throw new ArgumentException(string.Format("Could not append value from enumerated type '{0}'.", typeof(T).Name), ex);
			}    
		}

		public static T Remove<T> (this System.Enum type, T value)
		{
			try {
				return (T)(object)(((int)(object)type & ~(int)(object)value));
			} 
			catch (Exception ex) {
				throw new ArgumentException(string.Format("Could not remove value from enumerated type '{0}'.", typeof(T).Name), ex);
			}  
		}
	}
}