message: Only emit union constructors and setters if !returnedonly
diff: @@ -4175,6 +4175,8 @@ void VulkanHppGenerator::writeUnion(std::ostream & os, std::pair<std::string, St
  << " union " << stripPrefix(structure.first, "Vk") << std::endl
  << " {" << std::endl;
  + if (!structure.second.returnedOnly)
  + {
  bool firstTime = true;
  for (auto const& member : structure.second.members)
  {
  @@ -4209,6 +4211,7 @@ void VulkanHppGenerator::writeUnion(std::ostream & os, std::pair<std::string, St
  {
  writeStructSetter(os, stripPrefix(structure.first, "Vk"), member);
  }
  + }
  // the implicit cast operators to the native type
  os << " operator " << structure.first << " const&() const" << std::endl
  