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46 lines
2.2 KiB
46 lines
2.2 KiB
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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namespace Discord
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{
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internal static class CollectionExtensions
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{
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//public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TValue>(this IReadOnlyCollection<TValue> source)
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// => new CollectionWrapper<TValue>(source, () => source.Count);
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public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TValue>(this ICollection<TValue> source)
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=> new CollectionWrapper<TValue>(source, () => source.Count);
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//public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TKey, TValue>(this IReadOnlyDictionary<TKey, TValue> source)
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// => new CollectionWrapper<TValue>(source.Select(x => x.Value), () => source.Count);
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public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TKey, TValue>(this IDictionary<TKey, TValue> source)
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=> new CollectionWrapper<TValue>(source.Values, () => source.Count);
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public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TValue, TSource>(this IEnumerable<TValue> query, IReadOnlyCollection<TSource> source)
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=> new CollectionWrapper<TValue>(query, () => source.Count);
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public static IReadOnlyCollection<TValue> ToReadOnlyCollection<TValue>(this IEnumerable<TValue> query, Func<int> countFunc)
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=> new CollectionWrapper<TValue>(query, countFunc);
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}
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[DebuggerDisplay(@"{DebuggerDisplay,nq}")]
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internal struct CollectionWrapper<TValue> : IReadOnlyCollection<TValue>
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{
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private readonly IEnumerable<TValue> _query;
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private readonly Func<int> _countFunc;
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//It's okay that this count is affected by race conditions - we're wrapping a concurrent collection and that's to be expected
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public int Count => _countFunc();
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public CollectionWrapper(IEnumerable<TValue> query, Func<int> countFunc)
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{
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_query = query;
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_countFunc = countFunc;
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}
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private string DebuggerDisplay => $"Count = {Count}";
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public IEnumerator<TValue> GetEnumerator() => _query.GetEnumerator();
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IEnumerator IEnumerable.GetEnumerator() => _query.GetEnumerator();
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}
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}
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