Function convertToJson

src/ArduinoJson/Variant/VariantRefBaseImpl.hpp:64–67

template <typename TDerived>
inline void convertToJson(const VariantRefBase<TDerived>& src,
                          JsonVariant dst) {
  dst.set(src.template as<JsonVariantConst>());
}

template <typename TDerived>
template <typename T, enable_if_t<is_same<T, JsonVariant>::value, int>>