Method __execute

tiledb/stdx/bits/stop_token.h:552–562

 private:
  void __execute() noexcept {
    // Executed in a noexcept context
    // If it throws then we call std::terminate().
#ifdef SAFE
    __inExecute_.store(true);
    __cb_();
    __inExecute_.store(false);
#else
    __cb_();
#endif
  }

  __stop_state* __state_;
  _Callback __cb_;