| 155 | |
| 156 | template <typename T> |
| 157 | Shared<T> Owned<T>::share() |
| 158 | { |
| 159 | if (data == nullptr) { |
| 160 | // The ownership of this pointer has already been lost. |
| 161 | return Shared<T>(nullptr); |
| 162 | } |
| 163 | |
| 164 | // Atomically set the pointer 'data->t' to `nullptr`. |
| 165 | T* old = data->t.exchange(nullptr); |
| 166 | if (old == nullptr) { |
| 167 | // The ownership of this pointer has already been lost. |
| 168 | return Shared<T>(nullptr); |
| 169 | } |
| 170 | |
| 171 | data.reset(); |
| 172 | return Shared<T>(old); |
| 173 | } |
| 174 | |
| 175 | |
| 176 | template <typename T> |