/* ****************************************************************************
 *
 * Copyright (c) Microsoft Corporation. All rights reserved.
 *
 * This software is subject to the Microsoft Public License (Ms-PL). 
 * A copy of the license can be found in the license.htm file included 
 * in this distribution.
 *
 * You must not remove this notice, or any other, from this software.
 *
 * ***************************************************************************/

namespace System.Web.Mvc {
    using System;

    internal static class TypeHelpers {

        public static bool TypeAllowsNullValue(Type type) {
            // reference types allow null values
            if (!type.IsValueType) {
                return true;
            }

            // nullable value types allow null values
            // code lifted from System.Nullable.GetUnderlyingType()
            if (type.IsGenericType && !type.IsGenericTypeDefinition && (type.GetGenericTypeDefinition() == typeof(Nullable<>))) {
                return true;
            }

            // no other types allow null values
            return false;
        }

    }
}