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				// Copyright (c) 2018 The Bitcoin Core developers
				// Distributed under the MIT software license, see the accompanying
				// file COPYING or http://www.opensource.org/licenses/mit-license.php.

				#ifndef BITCOIN_INTERFACE_HANDLER_H
				#define BITCOIN_INTERFACE_HANDLER_H

				#include <memory>

				namespace boost {
				namespace signals2 {
				class connection;
				} // namespace signals2
				} // namespace boost

				namespace interface {

				//! Generic interface for managing an event handler or callback function
				//! registered with another interface. Has a single disconnect method to cancel
				//! the registration and prevent any future notifications.
				class Handler {
				public:
				virtual ~Handler() {}

				//! Disconnect the handler.
				virtual void disconnect() = 0;
				};

				//! Return handler wrapping a boost signal connection.
				std::unique_ptr<Handler> MakeHandler(boost::signals2::connection connection);

				} // namespace interface

				#endif // BITCOIN_INTERFACE_HANDLER_H