reverselock.h

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// Copyright (c) 2015 The Bitcoin Core developers
// Copyright (c) 2015-2018 The PIVX developers
// Copyright (c) 2018-2020 The DAPS Project developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_REVERSELOCK_H
#define BITCOIN_REVERSELOCK_H
 
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