Function isUnbound

src/ArduinoJson/Variant/VariantRefBase.hpp:42–44

Returns true if the reference is unbound.

  // Returns true if the reference is unbound.
  bool isUnbound() const {
    return !getData();
  }

  // Casts the value to the specified type.
  // https://arduinojson.org/v7/api/jsonvariant/as/