checkpoint for real

2020-04-27 12:34:56 -04:00
parent 6ed92261ec
commit c1618deb83
31 changed files with 1429 additions and 626 deletions
--- a/ReadOnlyCollectionWrapper`2.cs
+++ b/ReadOnlyCollectionWrapper`2.cs
@@ -1,4 +1,47 @@
-$HEADER$namespace $NAMESPACE$
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+
+namespace Foodsoft.Alpm
 {
-  public class $CLASS$ {$END$}
+    internal class ReadOnlyCollectionWrapper<TImpl, TElement> : IReadOnlyCollection<TElement> where TImpl : struct,
+        IReadOnlyItemsAccessor<TElement>
+    {
+        private TImpl _impl;
+        private SafeAlpmHandle SafeAlpmHandle => _impl.SafeAlpmHandle;
+
+        public ReadOnlyCollectionWrapper(TImpl impl)
+        {
+            _impl = impl;
+        }
+
+        private static unsafe IntPtr ListNext(IntPtr list) => ((alpm_list_t*) list)->next;
+        private static unsafe IntPtr ListData(IntPtr list) => ((alpm_list_t*) list)->data;
+        public IEnumerator<TElement> GetEnumerator()
+        {
+            var safeAlpmHandle = _impl.SafeAlpmHandle;
+            var release = false;
+
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try
+            {
+                safeAlpmHandle.DangerousAddRef(ref release);
+                if (!release) throw new ObjectDisposedException(_impl.GetType().FullName);
+                for (var list = _impl.GetItems(); list != IntPtr.Zero; list = ListNext(list))
+                {
+                    yield return _impl.PtrToItem(ListData(list));
+                }
+            }
+            finally
+            {
+                if (release)
+                    safeAlpmHandle.DangerousRelease();
+            }
+        }
+
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+        public int Count => (int) alpm.alpm_list_count(_impl.GetItems());
+    }
 }