Mojo: Simplify object serialization

mojo/public/bindings/generators/cpp_templates/struct_serialization_definition.tmpl

-{%- import "struct_macros.tmpl" as struct_macros %}
-{%- set class_name = "%s::internal::%s_Data"|format(namespace, struct.name) -%}
-{%- set param_name = struct.name|camel_to_underscores %}
-
-// static
-size_t ObjectTraits<{{class_name}}>::ComputeSizeOf(
-    const {{class_name}}* {{param_name}}) {
-  return sizeof(*{{param_name}})
-{%- for pf in struct.packed.packed_fields if pf.field.kind|is_object_kind %} +
-      mojo::internal::ComputeSizeOf({{param_name}}->{{pf.field.name}}())
-{%- endfor %};
-}
-
-// static
-{{class_name}}* ObjectTraits<{{class_name}}>::Clone(
-    const {{class_name}}* {{param_name}}, Buffer* buf) {
-  {{class_name}}* clone = {{class_name}}::New(buf);
-  memcpy(clone, {{param_name}}, sizeof(*{{param_name}}));
-{%- for pf in struct.packed.packed_fields if pf.field.kind|is_object_kind %}
-  clone->set_{{pf.field.name}}(mojo::internal::Clone({#
-      #}{{param_name}}->{{pf.field.name}}(), buf));
-{%- endfor %}
-{%- for pf in struct.packed.packed_fields if pf.field.kind|is_handle_kind %}
-  mojo::internal::ResetIfNonNull({{param_name}}->{{pf.field.name}}());
-{%- endfor %}
-  return clone;
-}
-
-// static
-void ObjectTraits<{{class_name}}>::CloseHandles(
-    {{class_name}}* {{param_name}}) {
-{%- for pf in struct.packed.packed_fields if pf.field.kind|is_object_kind %}
-  mojo::internal::CloseHandles({{param_name}}->{{pf.field.name}}_.ptr);
-{%- endfor %}
-{%- if struct|is_struct_with_handles %}
-  {{struct.name}}_Data_Destructor({{param_name}});
-{%- endif %}
-}
-
-// static
-void ObjectTraits<{{class_name}}>::EncodePointersAndHandles(
-    {{class_name}}* {{param_name}}, std::vector<mojo::Handle>* handles) {
-  {{ struct_macros.encodes(struct, param_name)|indent(2) }}
-}
-
-// static
-bool ObjectTraits<{{class_name}}>::DecodePointersAndHandles(
-    {{class_name}}* {{param_name}}, mojo::Message* message) {
-  {{ struct_macros.decodes(struct, param_name)|indent(2) }}
-  return true;
-}