checkpoint

Alpm/SafeAlpmHandle.cs

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+using System;
+using System.Runtime.ConstrainedExecution;
+using System.Runtime.InteropServices;
+using Foodsoft.Alpm;
+
+namespace Foodsoft.Alpm
+{
+    internal sealed class SafeAlpmHandle : SafeHandle
+    {
+        private SafeAlpmHandle() : base(IntPtr.Zero, true) { }
+
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail), PrePrepareMethod]
+        protected override bool ReleaseHandle() => alpm.alpm_release(handle) == 0;
+
+        public override bool IsInvalid
+        {
+            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success), PrePrepareMethod]
+            get => handle == IntPtr.Zero;
+        }
+    }
+}