checkpoint collections

SafeListHandle.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.ConstrainedExecution;
+
+namespace Foodsoft.Alpm
+{
+    internal struct ListRef : CriticalFinalIDisposable
+    {
+        public SafeAlpmHandle SafeAlpmHandle
+        {
+            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
+            [PrePrepareMethod]
+            get;
+        }
+        
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail), PrePrepareMethod]
+        public ListRef(SafeAlpmHandle handle)
+        {
+            SafeAlpmHandle = null!;
+            RuntimeHelpers.PrepareConstrainedRegions();
+            try { }
+            finally
+            {
+                SafeAlpmHandle = handle;
+                var success = false;
+                handle.DangerousAddRef(ref success);
+                if (success)
+                    SafeAlpmHandle = handle;
+                else
+                {
+                    SafeAlpmHandle = null!;
+                    throw new ObjectDisposedException(GetType().FullName);
+                }
+            }
+        }
+
+        ~ListRef()
+        {
+            
+        }
+        
+        public void Dispose()
+        {
+        }
+    }
+}