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A cancellation signal with a single slot.
class cancellation_signal
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                 Name  | 
                 Description  | 
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                 cancellation_signal [constructor]  | 
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                 Emits the signal and causes invocation of the slot's handler, if any.  | 
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                 Returns the single slot associated with the signal.  | 
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                 ~cancellation_signal [destructor]  | 
        Header: boost/asio/cancellation_signal.hpp
      
        Convenience header: boost/asio.hpp