68 lines
2.2 KiB
C#
68 lines
2.2 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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// This file is ported from ComputeSharp (Sergio0694/ComputeSharp),
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// more info in ThirdPartyNotices.txt in the root of the project.
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using System;
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using System.Collections.Generic;
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using System.Collections.Immutable;
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using System.Linq;
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namespace CommunityToolkit.Mvvm.SourceGenerators.Extensions;
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/// <summary>
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/// Extension methods for <see cref="IEqualityComparer{T}"/>.
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/// </summary>
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internal static class IEqualityComparerExtensions
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{
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/// <summary>
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/// Gets an <see cref="IEqualityComparer{T}"/> for an <see cref="ImmutableArray{T}"/> sequence.
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/// </summary>
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/// <typeparam name="T">The type of items to compare.</typeparam>
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/// <param name="comparer">The compare for individual <typeparamref name="T"/> items.</param>
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public static IEqualityComparer<ImmutableArray<T>> ForImmutableArray<T>(this IEqualityComparer<T> comparer)
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{
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return new Comparer<T>(comparer);
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}
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/// <summary>
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/// An <see cref="IEqualityComparer{T}"/> implementation for an <see cref="ImmutableArray{T}"/> value.
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/// </summary>
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private sealed class Comparer<T> : IEqualityComparer<ImmutableArray<T>>
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{
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/// <summary>
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/// The <typeparamref name="T"/> comparer.
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/// </summary>
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private readonly IEqualityComparer<T> comparer;
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/// <summary>
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/// Creates a new <see cref="Comparer{T}"/> instance with the specified parameters.
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/// </summary>
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/// <param name="comparer">The <typeparamref name="T"/> comparer.</param>
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public Comparer(IEqualityComparer<T> comparer)
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{
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this.comparer = comparer;
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}
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/// <inheritdoc/>
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public bool Equals(ImmutableArray<T> x, ImmutableArray<T> y)
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{
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return
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x == y ||
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x.SequenceEqual(y, this.comparer);
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}
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/// <inheritdoc/>
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public int GetHashCode(ImmutableArray<T> obj)
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{
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HashCode hashCode = default;
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hashCode.AddRange(obj, this.comparer);
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return hashCode.ToHashCode();
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}
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}
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}
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