Fix some schema generation issues

src/ifcopenshell-python/ifcopenshell/express/implementation.py

@@ -371,7 +371,7 @@ class Implementation(codegen.Base):
                             #     ("const std::weak_ptr<InstanceData>& e",),
                             #     "",
                             # ),
-                            ("", "", initializer, "", ("%s v" % type_str,), ("set_attribute_value(0, %s(v));" % ("cast_vector<express::Base>" if mapping.is_templated_list(type) else ""))) if mapping.simple_type_parent(class_name) is None else \
+                            ("", "", initializer, "", ("%s v" % type_str,), ("set_attribute_value(0, %s(v));" % ("cast_vector<express::Base>" if mapping.is_templated_list(type) else ""))),
                             # ("v", "", constructor, "", ("%s v" % type_str,), ""),
                             ("", "", templates.cast_function, type_str, (), simpletype_impl_cast),
                         ),

src/ifcopenshell-python/ifcopenshell/express/templates.py

@@ -264,7 +264,7 @@ get_attr_stmt = "%(null_check)s %(non_optional_type)s v = get_attribute_value(%(
 get_attr_stmt_enum = "%(null_check)s return %(non_optional_type)s::FromString(get_attribute_value(%(index)d));"
 get_attr_stmt_entity = "%(null_check)s return ((express::Base)(get_attribute_value(%(index)d))).as<%(non_optional_type_no_pointer)s>();"
 get_attr_stmt_array = "%(null_check)s std::vector<express::Base> es = get_attribute_value(%(index)d); return cast_vector<%(list_instance_type)s>(es);"
-get_attr_stmt_nested_array = "%(null_check)s std::vector<std::vector<express::Base>> es = get_attribute_value(%(index)d); return cast_vector_vector<%(list_instance_type)s>(es);"
+get_attr_stmt_nested_array = "%(null_check)s std::vector<std::vector<express::Base>> es = get_attribute_value(%(index)d); return cast_vector<%(list_instance_type)s>(es);"
 
 get_inverse = "return cast_vector<%(type)s>(file()->getInverse(data()->id(), %(schema_name_upper)s_types[%(type_index)d], %(index)d));"
 
@@ -279,7 +279,7 @@ set_attr_stmt_array = (
     "%(check_optional_set_begin)sset_attribute_value(%(index)d, cast_vector<express::Base>(%(star_if_optional)sv));%(check_optional_set_else)sunset_attribute_value(%(index)d);%(check_optional_set_end)s"
 )
 set_attr_stmt_nested_array = (
-    "%(check_optional_set_begin)sset_attribute_value(%(index)d, cast_vector_vector<express::Base>(%(star_if_optional)sv));%(check_optional_set_else)sunset_attribute_value(%(index)d);%(check_optional_set_end)s"
+    "%(check_optional_set_begin)sset_attribute_value(%(index)d, cast_vector<express::Base>(%(star_if_optional)sv));%(check_optional_set_else)sunset_attribute_value(%(index)d);%(check_optional_set_end)s"
 )
 
 constructor_stmt = (

src/ifcparse/express.h

@@ -205,8 +205,37 @@ struct hash<express::Entity> {
 
 } // namespace boost
 
+namespace {
+template <typename>
+struct is_std_vector : std::false_type {};
+
+template <typename X, typename A>
+struct is_std_vector<std::vector<X, A>> : std::true_type {};
+
+template <typename T>
+constexpr bool is_std_vector_v = is_std_vector<T>::value;
+
+template <typename T>
+struct is_std_vector_vector : std::false_type {};
+
+template <typename T, typename Alloc, typename Alloc2>
+struct is_std_vector_vector<std::vector<std::vector<T, Alloc>, Alloc2>> : std::true_type {};
+
+template <typename T>
+constexpr bool is_std_vector_vector_v = is_std_vector_vector<T>::value;
+}
+
 template <typename T, typename U>
-std::vector<T> cast_vector(const std::vector<U>& vs) {
+auto cast_vector(const std::vector<U>& vs) {
+    if constexpr (is_std_vector<U>::value) {
+        using V = typename U::value_type;
+        std::vector<std::vector<T>> result;
+        result.reserve(vs.size());
+        for (const auto& v : vs) {
+            result.push_back(cast_vector<T>(v));
+        }
+        return result;
+    } else {
         std::vector<T> result;
         for (const auto& v : vs) {
             if constexpr (std::is_base_of_v<T, U>) {
@@ -223,14 +252,6 @@ std::vector<T> cast_vector(const std::vector<U>& vs) {
         }
         return result;
     }
-
-template <typename T, typename U>
-std::vector<std::vector<T>> cast_vector_vector(const std::vector<std::vector<U>>& vs) {
-    std::vector<std::vector<T>> result;
-    for (const auto& v : vs) {
-        result.push_back(cast_vector<T>(v));
-    }
-    return result;
 }
 
 #endif

src/ifcwrap/IfcPython.i

@@ -262,24 +262,6 @@
 #endif
 %}
 
-%{
-
-template<typename T>
-struct is_std_vector : std::false_type {};
-template<typename T, typename Alloc>
-struct is_std_vector<std::vector<T, Alloc>> : std::true_type {};
-template<typename T>
-constexpr bool is_std_vector_v = is_std_vector<T>::value;
-
-template<typename T>
-struct is_std_vector_vector : std::false_type {};
-template<typename T, typename Alloc, typename Alloc2>
-struct is_std_vector_vector<std::vector<std::vector<T, Alloc>, Alloc2>> : std::true_type {};
-template<typename T>
-constexpr bool is_std_vector_vector_v = is_std_vector_vector<T>::value;
-
-%}
-
 // Create docstrings for generated python code.
 %feature("autodoc", "1");