//
// System.Nullable.cs
//
// Martin Baulig (martin@ximian.com)
// Marek Safar	 (marek.safar@gmail.com)
//
// (C) 2004 Novell, Inc.
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// 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.
//

using System.Reflection;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Diagnostics;

namespace System
{
	public partial struct Nullable<T> where T: struct
	{
		//
		// These are called by the JIT
		//
#pragma warning disable 169
		//
		// JIT implementation of box valuetype System.Nullable`1<T>
		//
		static object Box (T? o)
		{
			if (!o.hasValue)
				return null;
				
			return o.value;
		}
		
		static T? Unbox (object o)
		{
			if (o == null)
				return null;
			return (T) o;
		}

		static T? UnboxExact (object o)
		{
			if (o == null)
				return null;
			if (o.GetType() != typeof (T))
				throw new InvalidCastException();

			return (T) o;
		}

#pragma warning restore 169
	}
}
