| 55 | |
| 56 | template <typename T> |
| 57 | optional<T> Chan<T>::take() { |
| 58 | std::unique_lock<std::mutex> lock(mutex); |
| 59 | cv.wait(lock, [&] { return queue.size() > 0 || closed; }); |
| 60 | if (queue.size() == 0) { |
| 61 | return optional<T>(); |
| 62 | } |
| 63 | auto out = std::move(queue.front()); |
| 64 | queue.pop(); |
| 65 | return optional<T>(std::move(out)); |
| 66 | } |
| 67 | |
| 68 | template <typename T> |
| 69 | void Chan<T>::put(T&& in) { |