diff --git a/src/Runtime/Interfaces.cs b/src/Runtime/Interfaces.cs
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--- /dev/null
+++ b/src/Runtime/Interfaces.cs
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+/* Copyright (c) 2013 Xamarin, Inc and contributors
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+  * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+
+using System;
+
+namespace CppSharp.Runtime
+{
+    public interface ICppMarshal
+    {
+        /// <summary>
+        /// Converts the managed data to unmanaged data.
+        /// </summary>/// 
+        void MarshalManagedToNative(IntPtr instance);
+
+        /// <summary>
+        /// Converts the unmanaged data to managed data.
+        /// </summary>
+        void MarshalNativeToManaged(IntPtr instance);
+    }
+}