Merge pull request #86 from microavia/v1_fix_cpp17_empty

V1 fix cpp17 empty structs

messgen/cpp_generator.py

@@ -261,8 +261,6 @@ def _generate_type_struct(self, type_name):
  field_name = field["name"]
  field_type_def = self._protocols.get_type(curr_proto_name, field["type"])
  code_ser.extend(self._serialize_field(field_name, field_type_def))
- else:
- raise RuntimeError("Empty group in struct %s" % type_name)
  code_ser.append("")
  code_ser.append("return _size;")
 
@@ -293,8 +291,6 @@ def _generate_type_struct(self, type_name):
  field_name = field["name"]
  field_type_def = self._protocols.get_type(curr_proto_name, field["type"])
  code_deser.extend(self._deserialize_field(field_name, field_type_def))
- else:
- raise RuntimeError("Empty group in struct %s" % type_name)
  code_deser.append("")
  code_deser.append("return _size;")
 
@@ -345,11 +341,14 @@ def _generate_type_struct(self, type_name):
  if self._get_cpp_standard() < 20:
  # Operator ==
  code_eq = []
- field_name = fields[0]["name"]
- code_eq.append("return l.%s == r.%s" % (field_name, field_name))
- for field in fields[1:]:
- field_name = field["name"]
- code_eq.append(" and l.%s == r.%s" % (field_name, field_name))
+ if len(fields) > 0:
+ field_name = fields[0]["name"]
+ code_eq.append("return l.%s == r.%s" % (field_name, field_name))
+ for field in fields[1:]:
+ field_name = field["name"]
+ code_eq.append(" and l.%s == r.%s" % (field_name, field_name))
+ else:
+ code_eq.append("return true")
  code_eq[-1] += ";"
 
  code.extend([