Method SetOnDrop

crates/c-api/tests/val.cc:83–83

public:
  SetOnDrop() : flag_(std::make_shared<std::atomic<bool>>(false)) {}
  SetOnDrop(const SetOnDrop &) = delete;
  SetOnDrop(SetOnDrop &&obj) : flag_(obj.flag_) { obj.flag_.reset(); }
  ~SetOnDrop() {