17 Language support library [support]

17.12 Coroutines [support.coroutine]

17.12.4 Class template coroutine_handle [coroutine.handle]

17.12.4.5 Observers [coroutine.handle.observers]

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constexpr explicit operator bool() const noexcept;
1
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Returns: address() != nullptr.
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bool done() const;
2
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Preconditions: *this refers to a suspended coroutine.
3
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Returns: true if the coroutine is suspended at its final suspend point, otherwise false.