Method swap

ThirdParty/jsoncpp/vtkjsoncpp/jsoncpp.cpp:2715–2718

}

void Value::CZString::swap(CZString& other) {
  std::swap(cstr_, other.cstr_);
  std::swap(index_, other.index_);
}

Value::CZString& Value::CZString::operator=(const CZString& other) {
  cstr_ = other.cstr_;