// Copyright (c) 2018-2022 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_INTERFACES_HANDLER_H

#define BITCOIN_INTERFACES_HANDLER_H

#include <functional>

#include <memory>

namespace boost {

namespace signals2 {

class connection;

} // namespace signals2

} // namespace boost

namespace interfaces {

//! 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() = default;

    //! Disconnect the handler.

    virtual void disconnect() = 0;

};

//! Return handler wrapping a boost signal connection.

std::unique_ptr<Handler> MakeSignalHandler(boost::signals2::connection connection);

//! Return handler wrapping a cleanup function.

std::unique_ptr<Handler> MakeCleanupHandler(std::function<void()> cleanup);

} // namespace interfaces

#endif // BITCOIN_INTERFACES_HANDLER_H