// Copyright (c) 2015 The Bitcoin Core developers
// Distributed under the GPLv3 software license, see the accompanying
// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html

/******************************************************************************
 * Copyright © 2014-2019 The SuperNET Developers.                             *
 *                                                                            *
 * See the AUTHORS, DEVELOPER-AGREEMENT and LICENSE files at                  *
 * the top-level directory of this distribution for the individual copyright  *
 * holder information and the developer policies on copyright and licensing.  *
 *                                                                            *
 * Unless otherwise agreed in a custom licensing agreement, no part of the    *
 * SuperNET software, including this file may be copied, modified, propagated *
 * or distributed except according to the terms contained in the LICENSE file *
 *                                                                            *
 * Removal or modification of this copyright notice is prohibited.            *
 *                                                                            *
 ******************************************************************************/

#ifndef BITCOIN_REVERSELOCK_H
#define BITCOIN_REVERSELOCK_H

/**
 * An RAII-style reverse lock. Unlocks on construction and locks on destruction.
 */
template<typename Lock>
class reverse_lock
{
public:

    explicit reverse_lock(Lock& lock) : lock(lock) {
        lock.unlock();
        lock.swap(templock);
    }

    ~reverse_lock() {
        templock.lock();
        templock.swap(lock);
    }

private:
    reverse_lock(reverse_lock const&);
    reverse_lock& operator=(reverse_lock const&);

    Lock& lock;
    Lock templock;
};

#endif // BITCOIN_REVERSELOCK_H