diff --git a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_0.hpp b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_0.hpp
index c886527..6660dad 100644
--- a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_0.hpp
+++ b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_0.hpp
@@ -52,10 +52,10 @@ namespace xo {
             // const methods
             /** memory consumption for this instance **/
             static size_type shallow_size(const DPrimitive_gco_0 & self) noexcept;
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(const DPrimitive_gco_0 & self, obj<AAllocator> mm) noexcept;
 
             // non-const methods
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(DPrimitive_gco_0 & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DPrimitive_gco_0 & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_1_gco.hpp b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_1_gco.hpp
index ac5a443..a4aa56e 100644
--- a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_1_gco.hpp
+++ b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_1_gco.hpp
@@ -52,10 +52,10 @@ namespace xo {
             // const methods
             /** memory consumption for this instance **/
             static size_type shallow_size(const DPrimitive_gco_1_gco & self) noexcept;
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(const DPrimitive_gco_1_gco & self, obj<AAllocator> mm) noexcept;
 
             // non-const methods
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(DPrimitive_gco_1_gco & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DPrimitive_gco_1_gco & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_dict_string.hpp b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_dict_string.hpp
index 256ad71..a2e6e32 100644
--- a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_dict_string.hpp
+++ b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_dict_string.hpp
@@ -52,10 +52,10 @@ namespace xo {
             // const methods
             /** memory consumption for this instance **/
             static size_type shallow_size(const DPrimitive_gco_2_dict_string & self) noexcept;
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(const DPrimitive_gco_2_dict_string & self, obj<AAllocator> mm) noexcept;
 
             // non-const methods
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(DPrimitive_gco_2_dict_string & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DPrimitive_gco_2_dict_string & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_gco_gco.hpp b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_gco_gco.hpp
index fee6d62..bad1200 100644
--- a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_gco_gco.hpp
+++ b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_2_gco_gco.hpp
@@ -52,10 +52,10 @@ namespace xo {
             // const methods
             /** memory consumption for this instance **/
             static size_type shallow_size(const DPrimitive_gco_2_gco_gco & self) noexcept;
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(const DPrimitive_gco_2_gco_gco & self, obj<AAllocator> mm) noexcept;
 
             // non-const methods
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(DPrimitive_gco_2_gco_gco & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DPrimitive_gco_2_gco_gco & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_3_dict_string_gco.hpp b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_3_dict_string_gco.hpp
index 951bda1..6b5ddc3 100644
--- a/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_3_dict_string_gco.hpp
+++ b/include/xo/procedure2/detail/IGCObject_DPrimitive_gco_3_dict_string_gco.hpp
@@ -52,10 +52,10 @@ namespace xo {
             // const methods
             /** memory consumption for this instance **/
             static size_type shallow_size(const DPrimitive_gco_3_dict_string_gco & self) noexcept;
-            /** copy instance using allocator **/
-            static Opaque shallow_copy(const DPrimitive_gco_3_dict_string_gco & self, obj<AAllocator> mm) noexcept;
 
             // non-const methods
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(DPrimitive_gco_3_dict_string_gco & self, obj<AAllocator> mm) noexcept;
             /** during GC: forward immdiate children **/
             static size_type forward_children(DPrimitive_gco_3_dict_string_gco & self, obj<ACollector> gc) noexcept;
             ///@}
diff --git a/src/procedure2/facet/IGCObject_DPrimitive_gco_0.cpp b/src/procedure2/facet/IGCObject_DPrimitive_gco_0.cpp
index 1864246..9e07858 100644
--- a/src/procedure2/facet/IGCObject_DPrimitive_gco_0.cpp
+++ b/src/procedure2/facet/IGCObject_DPrimitive_gco_0.cpp
@@ -22,11 +22,10 @@ namespace xo {
         }
 
         auto
-        IGCObject_DPrimitive_gco_0::shallow_copy(const DPrimitive_gco_0 & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DPrimitive_gco_0::shallow_copy(DPrimitive_gco_0 & self, obj<AAllocator> mm) noexcept -> Opaque
         {
             return self.shallow_copy(mm);
         }
-
         auto
         IGCObject_DPrimitive_gco_0::forward_children(DPrimitive_gco_0 & self, obj<ACollector> gc) noexcept -> size_type
         {
diff --git a/src/procedure2/facet/IGCObject_DPrimitive_gco_1_gco.cpp b/src/procedure2/facet/IGCObject_DPrimitive_gco_1_gco.cpp
index 6d7205d..b9a1b35 100644
--- a/src/procedure2/facet/IGCObject_DPrimitive_gco_1_gco.cpp
+++ b/src/procedure2/facet/IGCObject_DPrimitive_gco_1_gco.cpp
@@ -22,11 +22,10 @@ namespace xo {
         }
 
         auto
-        IGCObject_DPrimitive_gco_1_gco::shallow_copy(const DPrimitive_gco_1_gco & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DPrimitive_gco_1_gco::shallow_copy(DPrimitive_gco_1_gco & self, obj<AAllocator> mm) noexcept -> Opaque
         {
             return self.shallow_copy(mm);
         }
-
         auto
         IGCObject_DPrimitive_gco_1_gco::forward_children(DPrimitive_gco_1_gco & self, obj<ACollector> gc) noexcept -> size_type
         {
diff --git a/src/procedure2/facet/IGCObject_DPrimitive_gco_2_dict_string.cpp b/src/procedure2/facet/IGCObject_DPrimitive_gco_2_dict_string.cpp
index ec65d3d..7bc9965 100644
--- a/src/procedure2/facet/IGCObject_DPrimitive_gco_2_dict_string.cpp
+++ b/src/procedure2/facet/IGCObject_DPrimitive_gco_2_dict_string.cpp
@@ -22,11 +22,10 @@ namespace xo {
         }
 
         auto
-        IGCObject_DPrimitive_gco_2_dict_string::shallow_copy(const DPrimitive_gco_2_dict_string & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DPrimitive_gco_2_dict_string::shallow_copy(DPrimitive_gco_2_dict_string & self, obj<AAllocator> mm) noexcept -> Opaque
         {
             return self.shallow_copy(mm);
         }
-
         auto
         IGCObject_DPrimitive_gco_2_dict_string::forward_children(DPrimitive_gco_2_dict_string & self, obj<ACollector> gc) noexcept -> size_type
         {
diff --git a/src/procedure2/facet/IGCObject_DPrimitive_gco_2_gco_gco.cpp b/src/procedure2/facet/IGCObject_DPrimitive_gco_2_gco_gco.cpp
index b889d0d..e770888 100644
--- a/src/procedure2/facet/IGCObject_DPrimitive_gco_2_gco_gco.cpp
+++ b/src/procedure2/facet/IGCObject_DPrimitive_gco_2_gco_gco.cpp
@@ -22,11 +22,10 @@ namespace xo {
         }
 
         auto
-        IGCObject_DPrimitive_gco_2_gco_gco::shallow_copy(const DPrimitive_gco_2_gco_gco & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DPrimitive_gco_2_gco_gco::shallow_copy(DPrimitive_gco_2_gco_gco & self, obj<AAllocator> mm) noexcept -> Opaque
         {
             return self.shallow_copy(mm);
         }
-
         auto
         IGCObject_DPrimitive_gco_2_gco_gco::forward_children(DPrimitive_gco_2_gco_gco & self, obj<ACollector> gc) noexcept -> size_type
         {
diff --git a/src/procedure2/facet/IGCObject_DPrimitive_gco_3_dict_string_gco.cpp b/src/procedure2/facet/IGCObject_DPrimitive_gco_3_dict_string_gco.cpp
index 7b199bd..f2dd967 100644
--- a/src/procedure2/facet/IGCObject_DPrimitive_gco_3_dict_string_gco.cpp
+++ b/src/procedure2/facet/IGCObject_DPrimitive_gco_3_dict_string_gco.cpp
@@ -22,11 +22,10 @@ namespace xo {
         }
 
         auto
-        IGCObject_DPrimitive_gco_3_dict_string_gco::shallow_copy(const DPrimitive_gco_3_dict_string_gco & self, obj<AAllocator> mm) noexcept -> Opaque
+        IGCObject_DPrimitive_gco_3_dict_string_gco::shallow_copy(DPrimitive_gco_3_dict_string_gco & self, obj<AAllocator> mm) noexcept -> Opaque
         {
             return self.shallow_copy(mm);
         }
-
         auto
         IGCObject_DPrimitive_gco_3_dict_string_gco::forward_children(DPrimitive_gco_3_dict_string_gco & self, obj<ACollector> gc) noexcept -> size_type
         {