bbradson
53 lines
2.4 KiB
C#
53 lines
2.4 KiB
C#
// Copyright (c) 2022 bradson
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at https://mozilla.org/MPL/2.0/.
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.CompilerServices;
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namespace FisheryLib;
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public static class HashCode
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static unsafe int Get<T>([AllowNull] T obj) => FunctionPointers.GetHashCode<T>.Default(obj!);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static unsafe int Get<T>([AllowNull] ref T obj) => FunctionPointers.GetHashCodeByRef<T>.Default(ref obj!);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Combine<T_first, T_second>(T_first first, T_second second)
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//where T_first : notnull where T_second : notnull
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=> Combine(Get(first), Get(second));
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// https://stackoverflow.com/questions/1646807/quick-and-simple-hash-code-combinations/34006336#34006336
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Combine(int first, int second) => unchecked((1009 * 9176) + first).CombineWith(second);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Combine<T_first, T_second, T_third>(T_first first, T_second second, T_third third)
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//where T_first : notnull where T_second : notnull where T_third : notnull
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=> Combine(first, second).CombineWith(third);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Combine(int first, int second, int third) => Combine(first, second).CombineWith(third);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Combine<T_first, T_second, T_third, T_fourth>(T_first first, T_second second, T_third third,
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T_fourth fourth)
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//where T_first : notnull where T_second : notnull where T_third : notnull where T_fourth : notnull
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=> Combine(first, second, third).CombineWith(fourth);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Combine(int first, int second, int third, int fourth)
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=> Combine(first, second, third).CombineWith(fourth);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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internal static int CombineWith(this int first, int second) => unchecked((first * 9176) + second);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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internal static int CombineWith<T>(this int first, T second)
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//where T : notnull
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=> unchecked((first * 9176) + Get(second));
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} |