std::future::future - cppreference.com ([original](https://en.cppreference.com/w/cpp/thread/future/future.html)) (raw)
Releases any shared state. This means:
- If the current object holds the last reference to its shared state, the shared state is destroyed.
- The current object gives up its reference to its shared state.
| These actions will not block for the shared state to become ready, except that they may block if all following conditions are satisfied: The shared state was created by a call to std::async. The shared state is not yet ready. The current object was the last reference to the shared state. | (since C++14) |
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