al_singleton.h

/****************************************************************************
 * modules/include/audiolite/al_singleton.h
 *
 *   Copyright 2023 Sony Semiconductor Solutions Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Sony Semiconductor Solutions Corporation nor
 *    the names of its contributors may be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
 
#ifndef __INCLUDE_AUDIOLITE_SINGLETON_H
#define __INCLUDE_AUDIOLITE_SINGLETON_H
 
/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
 
#define SINGLETON_MEMBER(t) static t *_inst
#define SINGLETON_INST(t) t *t::_inst = NULL
#define SINGLETON_METHODS(t) static t *get_instance() \
            { if (_inst == NULL) {_inst = new t;} return _inst; }; \
          static void terminate_instance() { \
            if (_inst) { delete _inst; _inst = NULL; } }
 
#endif  /* __INCLUDE_AUDIOLITE_SINGLETON_H */