47 lines
1.5 KiB
C#
47 lines
1.5 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Runtime.CompilerServices;
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namespace Foodsoft.Alpm
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{
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internal class ReadOnlyCollectionWrapper<TImpl, TElement> : IReadOnlyCollection<TElement> where TImpl : struct,
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IReadOnlyItemsAccessor<TElement>
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{
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private TImpl _impl;
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private SafeAlpmHandle SafeAlpmHandle => _impl.SafeAlpmHandle;
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public ReadOnlyCollectionWrapper(TImpl impl)
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{
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_impl = impl;
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}
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private static unsafe IntPtr ListNext(IntPtr list) => ((alpm_list_t*) list)->next;
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private static unsafe IntPtr ListData(IntPtr list) => ((alpm_list_t*) list)->data;
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public IEnumerator<TElement> GetEnumerator()
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{
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var safeAlpmHandle = _impl.SafeAlpmHandle;
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var release = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try
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{
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safeAlpmHandle.DangerousAddRef(ref release);
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if (!release) throw new ObjectDisposedException(_impl.GetType().FullName);
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for (var list = _impl.GetItems(); list != IntPtr.Zero; list = ListNext(list))
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{
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yield return _impl.PtrToItem(ListData(list));
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}
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}
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finally
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{
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if (release)
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safeAlpmHandle.DangerousRelease();
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}
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}
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
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public int Count => (int) alpm.alpm_list_count(_impl.GetItems());
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}
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} |