asio C++ library
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cancellation_slot::is_connected

Returns whether the slot is connected to a signal. 

constexpr bool is_connected() const;
Copyright © 2003-2021 Christopher M. Kohlhoff

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

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