Issue 5603 - Support references in parameters of exported functions

compiled/bindings/generator.h

Index: compiled/bindings/generator.h
===================================================================
--- a/compiled/bindings/generator.h
+++ b/compiled/bindings/generator.h
@@ -39,17 +39,18 @@ namespace bindings_internal
     VOID,
     INT,
     INT64,
     FLOAT,
     DOUBLE,
     DEPENDENT_STRING,
     OWNED_STRING,
     STRING_REF,
-    CLASS_PTR
+    CLASS_PTR,
+    CLASS_REF
   };
 
   template<typename T>
   struct TypeInfo
   {
     /*
      * Since TypeInfo is a templated type, in practice the compiler will define
      * a new type for each possible template parameter value. We use that fact
@@ -91,16 +92,19 @@ namespace bindings_internal
         std::is_same<DependentString&, T>())
       {
         return TypeCategory::STRING_REF;
       }
 
       if (std::is_pointer<T>() && std::is_class<typename std::remove_pointer<T>::type>())
         return TypeCategory::CLASS_PTR;
 
+      if (std::is_reference<T>() && std::is_class<typename std::remove_reference<T>::type>())
+        return TypeCategory::CLASS_REF;
+
       return TypeCategory::UNKNOWN;
     }
 
     constexpr TYPEID pointer_type() const
     {
       if (std::is_pointer<T>())
         return TypeInfo<typename std::remove_pointer<T>::type>();
       else