MultiCallback.h

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/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * MultiCallback.h
 * A callback which can be executed multiple times. When a pre-defined limit
 * is reached, then the underlying callback is executed.
 * Copyright (C) 2011 Simon Newton
 */

#ifndef INCLUDE_OLA_MULTICALLBACK_H_
#define INCLUDE_OLA_MULTICALLBACK_H_

#include <ola/Callback.h>

namespace ola {

class MultiCallback: public BaseCallback0<void> {
 public:
    MultiCallback(unsigned int limit,
                  BaseCallback0<void> *callback)
      : m_count(0),
        m_limit(limit),
        m_callback(callback) {
      if (!limit) {
        callback->Run();
        delete this;
      }
    }

    void Run() {
      if (++m_count == m_limit) {
        m_callback->Run();
        delete this;
      }
    }

 private:
    unsigned int m_count;
    unsigned int m_limit;
    BaseCallback0<void> *m_callback;
};

inline BaseCallback0<void>* NewMultiCallback(
    unsigned int limit,
    BaseCallback0<void> *callback) {
  return new MultiCallback(limit, callback);
}
}  // namespace ola
#endif  // INCLUDE_OLA_MULTICALLBACK_H_