diff --git a/include/xo/object2/array/IGCObject_DArray.hpp b/include/xo/object2/array/IGCObject_DArray.hpp
index 5540d32..04669db 100644
--- a/include/xo/object2/array/IGCObject_DArray.hpp
+++ b/include/xo/object2/array/IGCObject_DArray.hpp
@@ -48,8 +48,6 @@ namespace xo {
             /** @defgroup scm-gcobject-darray-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DArray & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/object2/boolean/IGCObject_DBoolean.hpp b/include/xo/object2/boolean/IGCObject_DBoolean.hpp
index 2711b1e..15ba4f7 100644
--- a/include/xo/object2/boolean/IGCObject_DBoolean.hpp
+++ b/include/xo/object2/boolean/IGCObject_DBoolean.hpp
@@ -48,8 +48,6 @@ namespace xo {
             /** @defgroup scm-gcobject-dboolean-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DBoolean & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/object2/dictionary/IGCObject_DDictionary.hpp b/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
index 375c4a6..173f7a4 100644
--- a/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
+++ b/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
@@ -48,8 +48,6 @@ namespace xo {
             /** @defgroup scm-gcobject-ddictionary-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DDictionary & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/object2/error/IGCObject_DRuntimeError.hpp b/include/xo/object2/error/IGCObject_DRuntimeError.hpp
index 2726b69..25e6e24 100644
--- a/include/xo/object2/error/IGCObject_DRuntimeError.hpp
+++ b/include/xo/object2/error/IGCObject_DRuntimeError.hpp
@@ -48,8 +48,6 @@ namespace xo {
             /** @defgroup scm-gcobject-druntimeerror-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DRuntimeError & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/object2/list/IGCObject_DList.hpp b/include/xo/object2/list/IGCObject_DList.hpp
index 78836d0..6132041 100644
--- a/include/xo/object2/list/IGCObject_DList.hpp
+++ b/include/xo/object2/list/IGCObject_DList.hpp
@@ -48,8 +48,6 @@ namespace xo {
             /** @defgroup scm-gcobject-dlist-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DList & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/object2/number/IGCObject_DFloat.hpp b/include/xo/object2/number/IGCObject_DFloat.hpp
index 8f78a0b..accf1ea 100644
--- a/include/xo/object2/number/IGCObject_DFloat.hpp
+++ b/include/xo/object2/number/IGCObject_DFloat.hpp
@@ -49,8 +49,6 @@ namespace xo {
             /** @defgroup scm-gcobject-dfloat-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DFloat & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/include/xo/object2/number/IGCObject_DInteger.hpp b/include/xo/object2/number/IGCObject_DInteger.hpp
index 5e135ed..8b418e1 100644
--- a/include/xo/object2/number/IGCObject_DInteger.hpp
+++ b/include/xo/object2/number/IGCObject_DInteger.hpp
@@ -48,8 +48,6 @@ namespace xo {
             /** @defgroup scm-gcobject-dinteger-methods **/
             ///@{
             // const methods
-            /** memory consumption for this instance **/
-            static size_type shallow_size(const DInteger & self) noexcept;
 
             // non-const methods
             /** move instance using allocator **/
diff --git a/src/object2/IGCObject_DArray.cpp b/src/object2/IGCObject_DArray.cpp
index 79273db..84c4768 100644
--- a/src/object2/IGCObject_DArray.cpp
+++ b/src/object2/IGCObject_DArray.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DArray::shallow_size(const DArray & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DArray::shallow_move(DArray & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/object2/IGCObject_DBoolean.cpp b/src/object2/IGCObject_DBoolean.cpp
index 10e97b2..0c1f3a8 100644
--- a/src/object2/IGCObject_DBoolean.cpp
+++ b/src/object2/IGCObject_DBoolean.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DBoolean::shallow_size(const DBoolean & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DBoolean::shallow_move(DBoolean & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/object2/IGCObject_DDictionary.cpp b/src/object2/IGCObject_DDictionary.cpp
index bcdef5b..e8c890a 100644
--- a/src/object2/IGCObject_DDictionary.cpp
+++ b/src/object2/IGCObject_DDictionary.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DDictionary::shallow_size(const DDictionary & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DDictionary::shallow_move(DDictionary & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/object2/IGCObject_DFloat.cpp b/src/object2/IGCObject_DFloat.cpp
index f2a1aa3..4908db8 100644
--- a/src/object2/IGCObject_DFloat.cpp
+++ b/src/object2/IGCObject_DFloat.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DFloat::shallow_size(const DFloat & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DFloat::shallow_move(DFloat & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/object2/IGCObject_DInteger.cpp b/src/object2/IGCObject_DInteger.cpp
index b0233bf..9994447 100644
--- a/src/object2/IGCObject_DInteger.cpp
+++ b/src/object2/IGCObject_DInteger.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DInteger::shallow_size(const DInteger & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DInteger::shallow_move(DInteger & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/object2/IGCObject_DList.cpp b/src/object2/IGCObject_DList.cpp
index 813db3d..138f707 100644
--- a/src/object2/IGCObject_DList.cpp
+++ b/src/object2/IGCObject_DList.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DList::shallow_size(const DList & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DList::shallow_move(DList & self, obj<ACollector> gc) noexcept -> Opaque
         {
diff --git a/src/object2/IGCObject_DRuntimeError.cpp b/src/object2/IGCObject_DRuntimeError.cpp
index b8e5dbd..fad4684 100644
--- a/src/object2/IGCObject_DRuntimeError.cpp
+++ b/src/object2/IGCObject_DRuntimeError.cpp
@@ -15,12 +15,6 @@
 
 namespace xo {
     namespace scm {
-        auto
-        IGCObject_DRuntimeError::shallow_size(const DRuntimeError & self) noexcept -> size_type
-        {
-            return self.shallow_size();
-        }
-
         auto
         IGCObject_DRuntimeError::shallow_move(DRuntimeError & self, obj<ACollector> gc) noexcept -> Opaque
         {