// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
// This is needed due to NativeAOT which doesn't enable nullable globally yet
#nullable enable
 
namespace ILLink.Shared.DataFlow
{
    // This is a sum type over the various kinds of values we track:
    // - dynamicallyaccessedmembertypes-annotated locations (types or strings)
    // - known typeof values and similar
    // - known strings
    // - known integers
 
    public abstract record SingleValue : IDeepCopyValue<SingleValue>
    {
        // All values must explicitely declare their ability to deep copy itself.
        // If the value is immutable, it can "return this" as an optimization.
        // Note: Since immutability is relatively tricky to determine, we require all values
        //       to explicitly implement the DeepCopy, even though the expectation is that
        //       most values will just "return this".
        public abstract SingleValue DeepCopy();
    }
}