| 97 | __callback_t __on_stop_{}; |
| 98 | |
| 99 | void register_token(_Receiver& __receiver) noexcept |
| 100 | { |
| 101 | if constexpr (!unstoppable_token<__stop_token_t>) |
| 102 | { |
| 103 | // register stop callback: |
| 104 | __on_stop_.emplace(get_stop_token(STDEXEC::get_env(__receiver)), |
| 105 | __on_stop_request{__stop_source_}); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | void unregister_token() noexcept |
| 110 | { |