CentralizedControl/Veldrid.Common/Poly2Tri/Utility/FixedArray3.cs

/* Poly2Tri
 * Copyright (c) 2009-2010, Poly2Tri Contributors
 * http://code.google.com/p/poly2tri/
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * * Neither the name of Poly2Tri nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections;
using System.Collections.Generic;

namespace Veldrid.Common.Poly2Tri.Utility
{
	public struct FixedArray3<T> : IEnumerable<T> where T:class {
		public T _0, _1, _2;
		public T this[ int index ] { get {
			switch ( index ) {
			case 0: return _0;
			case 1: return _1;
			case 2: return _2;
			default: throw new IndexOutOfRangeException();
			}
		} set {
			switch ( index ) {
			case 0: _0 = value; break;
			case 1: _1 = value; break;
			case 2: _2 = value; break;
			default: throw new IndexOutOfRangeException();
			}
		}}
		public bool Contains( T value ) {
			for ( int i = 0 ; i < 3 ; ++i ) if ( this[i]==value ) return true;
			return false;
		}
		public int IndexOf( T value ) {
			for ( int i = 0 ; i < 3 ; ++i ) if ( this[i]==value ) return i;
			return -1;
		}
		public void Clear() {
			_0=_1=_2=null;
		}
		public void Clear( T value ) {
			for ( int i = 0 ; i < 3 ; ++i ) if ( this[i]==value ) this[i] = null;
		}

		private IEnumerable<T> Enumerate() {
			for ( int i=0 ; i<3 ; ++i ) yield return this[i];
		}
		public IEnumerator<T> GetEnumerator() { return Enumerate().GetEnumerator(); }
		IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
	}
}