Added a new kind of parameter, HiddenStructureReturn, that is used to model ABI-specific parameters that are needed when returning structures/classes by value.

src/Bridge/Function.cs

@@ -24,6 +24,7 @@ namespace Cxxi
     public enum ParameterKind
     {
         Regular,
+        HiddenStructureReturn
     }
 
     public class Parameter : Declaration, ITypedDecl
@@ -90,6 +91,15 @@ namespace Cxxi
             get { return CallingConvention == CallingConvention.C; }
         }
 
+        public bool HasHiddenStructParameter
+        {
+            get
+            {
+                return Parameters.Any(param =>
+                    param.Kind == ParameterKind.HiddenStructureReturn);
+            }
+        }
+
         // Mangled name
         public string Mangled { get; set; }