Mojo: Simplify object serialization

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

 {%- macro setters(struct) %}
 {%    for packed_field in struct.packed.packed_fields %}
 {%-     set type = packed_field.field.kind|cpp_type %}
 {%-     set name = packed_field.field.name %}
 {%-     if packed_field.field.kind|is_object_kind %}
   void set_{{name}}({{type}} {{name}}) { {{name}}_.ptr = {{name}}; }
 {%-     else %}
   void set_{{name}}({{type}} {{name}}) { {{name}}_ = {{name}}; }
 {%-     endif %}
 {%-   endfor %}
@@ skipping 43 matching lines @@
 {%-   if num_fields > 0 %}
 {%-     set last_field = struct.packed.packed_fields[num_fields - 1] %}
 {%-     set offset = last_field.offset + last_field.size %}
 {%-     set pad = offset|get_pad(8) -%}
 {%-     if pad > 0 %}
   uint8_t _pad{{pad_count}}_[{{pad}}];
 {%-     endif %}
 {%-   endif %}
 {%- endmacro %}
 
-{%- macro encodes(struct, param_name) -%}
+{%- macro encodes(struct) -%}
 {%-   for pf in struct.packed.packed_fields if pf.field.kind|is_object_kind -%}
-Encode(&{{param_name}}->{{pf.field.name}}_, handles);
+mojo::internal::Encode(&{{pf.field.name}}_, handles);
 {%    endfor %}
 {%-   for pf in struct.packed.packed_fields if pf.field.kind|is_handle_kind -%}
-EncodeHandle(&{{param_name}}->{{pf.field.name}}_, handles);
+mojo::internal::EncodeHandle(&{{pf.field.name}}_, handles);
 {%    endfor %}
 {%- endmacro -%}
 
-{%- macro decodes(struct, param_name) -%}
+{%- macro decodes(struct) -%}
 {%-   for pf in struct.packed.packed_fields if pf.field.kind|is_object_kind -%}
-if (!Decode(&{{param_name}}->{{pf.field.name}}_, message))
+if (!mojo::internal::Decode(&{{pf.field.name}}_, message))
   return false;
 {%    endfor %}
 {%-   for pf in struct.packed.packed_fields if pf.field.kind|is_handle_kind -%}
-if (!DecodeHandle(&{{param_name}}->{{pf.field.name}}_, &message->handles))
+if (!mojo::internal::DecodeHandle(&{{pf.field.name}}_, &message->handles))
   return false;
 {%    endfor %}
 {%- endmacro -%}