//

// immer: immutable data structures for C++

// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente

//

// This software is distributed under the Boost Software License, Version 1.0.

// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt

//

#pragma once

#include <immer/refcount/no_refcount_policy.hpp>

#include <atomic>

#include <utility>

namespace immer {

/*!

 * A reference counting policy implemented using a raw `int` count.

 * It is **not thread-safe**.

 */

struct unsafe_refcount_policy

{

    mutable int refcount;

    unsafe_refcount_policy()

        : refcount{1} {};

    unsafe_refcount_policy(disowned)

        : refcount{0}

    {}

    void inc() { ++refcount; }

    bool dec() { return --refcount == 0; }

    bool unique() { return refcount == 1; }

};

} // namespace immer