counter.hpp

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/*
    Copyright 2005-2007 Adobe Systems Incorporated
    Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt
    or a copy at http://stlab.adobe.com/licenses.html)
*/

/******************************************************************************/

#ifndef ADOBE_COUNTER_HPP
#define ADOBE_COUNTER_HPP

/******************************************************************************/

#include <adobe/config.hpp>

#include <boost/noncopyable.hpp>

#include <adobe/implementation/atomic_primitives.hpp>

/******************************************************************************/

namespace adobe {

/******************************************************************************/

class counter_t
#if !defined(ADOBE_NO_DOCUMENTATION)
    : boost::noncopyable
#endif
{
public:
    counter_t()
    {
        count_m = implementation::atomic_t::value_type(1);
    }

    void increment()
    {
        ++count_m;
    }

    bool decrement()
    {
        return --count_m == implementation::atomic_t::value_type(0);
    }

    bool is_one() const
    {
        return count_m == implementation::atomic_t::value_type(1);
    }

private:
    implementation::atomic_t::type count_m;
};

/******************************************************************************/

} // namespace adobe

/******************************************************************************/
// ADOBE_COUNTER_HPP
#endif

/******************************************************************************/