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// 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.
#if !NETSTANDARD2_0
using System;
#endif
// This is needed due to NativeAOT which doesn't enable nullable globally yet
#nullable enable
namespace ILLink.Shared
{
internal static class HashUtils
{
#if NETSTANDARD2_0
// This constant is taken from code that Roslyn generates for GetHashCode of records.
const int Multiplier = -1521134295;
#endif
public static int Combine<T1, T2> (T1 value1, T2 value2)
where T1 : notnull
where T2 : notnull
{
#if NETSTANDARD2_0
return value1.GetHashCode () * Multiplier + value2.GetHashCode ();
#else
return HashCode.Combine (value1, value2);
#endif
}
public static int Combine<T1, T2, T3> (T1 value1, T2 value2, T3 value3)
where T1 : notnull
where T2 : notnull
where T3 : notnull
{
#if NETSTANDARD2_0
return (value1.GetHashCode () * Multiplier + value2.GetHashCode ()) * Multiplier + value3.GetHashCode ();
#else
return HashCode.Combine (value1, value2, value3);
#endif
}
}
}
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