/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef _NULLCANVAS_USAGECOUNTER_HXX
#define _NULLCANVAS_USAGECOUNTER_HXX

#include <osl/interlck.h>
#include <boost/current_function.hpp>

namespace nullcanvas
{
    /** Little resource tracking counter.

        When using this object, a global use counter, specific to the
        given type is incremented on object construction, and
        decremented on object destruction.
     */
    template< class Type > class UsageCounter
    {
    public:
        UsageCounter()
        {
            OSL_TRACE( "%s, %d objects currently in use.\n",
                       BOOST_CURRENT_FUNCTION,
                       osl_atomic_increment( &s_nCount ) );
        }

        ~UsageCounter()
        {
            const sal_Int32 nCount( osl_atomic_decrement( &s_nCount ) );

            if( !nCount )
            {
                OSL_TRACE( "%s, last instance deleted.\n",
                           BOOST_CURRENT_FUNCTION );
            }
            else
            {
                OSL_TRACE( "%s, %d instances left.\n",
                           BOOST_CURRENT_FUNCTION,
                           nCount );
            }
        }

    private:
        static oslInterlockedCount s_nCount;
    };

    template< class Type > oslInterlockedCount UsageCounter<Type>::s_nCount = 0;
}

#endif /* _NULLCANVAS_USAGECOUNTER_HXX */

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */