62 lines
1.9 KiB
C#
62 lines
1.9 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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namespace JM.LinqFaster.Utils {
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//Takes a comparer, and creates a reverse comparer, for Descending sorts
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internal sealed class ComparerReverser<T> : IComparer<T> {
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private readonly IComparer<T> wrappedComparer;
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public ComparerReverser(IComparer<T> wrappedComparer) {
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this.wrappedComparer = wrappedComparer;
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}
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#if !(UNITY_4 || UNITY_5)
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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#endif
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public int Compare(T x, T y) {
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return wrappedComparer.Compare(y, x);
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}
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}
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internal static class ComparerExtensions {
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// Lets us reverse a comparere with comparer.Reverse();
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public static IComparer<T> Reverse<T>(this IComparer<T> comparer) {
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return new ComparerReverser<T>(comparer);
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}
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}
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internal sealed class LambdaComparer<T, U> : IComparer<T> {
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IComparer<U> comparer;
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Func<T, U> selector;
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public LambdaComparer(Func<T, U> selector, IComparer<U> comparer) {
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this.comparer = comparer;
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this.selector = selector;
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}
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#if !(UNITY_4 || UNITY_5)
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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#endif
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public int Compare(T x, T y) {
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return comparer.Compare(selector(x), selector(y));
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}
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}
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internal sealed class ReverseLambdaComparer<T, U> : IComparer<T> {
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IComparer<U> comparer;
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Func<T, U> selector;
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public ReverseLambdaComparer(Func<T, U> selector, IComparer<U> comparer) {
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this.comparer = comparer;
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this.selector = selector;
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}
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#if !(UNITY_4 || UNITY_5)
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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#endif
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public int Compare(T x, T y) {
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return comparer.Compare(selector(y), selector(x));
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}
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}
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}
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