Struct types also need to have a default constructor taking the native instance.

src/Generator/Generators/CLI/CLIHeadersTemplate.cs

@@ -198,19 +198,20 @@ namespace Cxxi.Generators.CLI
             WriteLine("{");
             WriteLine("public:");
 
-            if (!@class.IsValueType)
+            var nativeType = string.Format("::{0}*", @class.OriginalName);
+
+            if (@class.IsRefType)
             {
                 PushIndent();
-                var nativeType = string.Format("::{0}*", @class.OriginalName);
                 WriteLine("property {0} NativePtr;", nativeType);
                 PopIndent();
                 NewLine();
+            }
 
             // Output a default constructor that takes the native pointer.
             PushIndent();
             WriteLine("{0}({1} native);", SafeIdentifier(@class.Name), nativeType);
             PopIndent();
-            }
 
             if (@class.IsValueType)
             {