count.hh 2.89 KB
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// Copyright (C) 2007 EPITA Research and Development Laboratory
//
// This file is part of the Olena Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License version 2 as published by the
// Free Software Foundation.
//
// 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING.  If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free
// software library without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to
// produce an executable, this file does not by itself cause the
// resulting executable to be covered by the GNU General Public
// License.  This exception does not however invalidate any other
// reasons why the executable file might be covered by the GNU General
// Public License.

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#ifndef MLN_ACCU_COUNT_HH
# define MLN_ACCU_COUNT_HH
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/*! \file mln/accu/count.hh
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 *
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 * \brief Define an accumulator that counts.
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 */

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# include <mln/core/concept/meta_accumulator.hh>
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namespace mln
{

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  namespace accu
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  {


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    /*! Generic counter accumulator class.
     */
    template <typename V>
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    struct count_ : public Accumulator< count_<V> >
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    {
      typedef V value;
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      typedef std::size_t result; // FIXME: Up in Accumulator.
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      count_();
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      void init();
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      void take(const value&);
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      void take(const count_<V>& other);
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      std::size_t to_result() const;
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      void set_value(std::size_t c);
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    protected:

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      std::size_t count__;
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    };
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    // FIXME: Doc!
    struct count : public Meta_Accumulator< count >
    {
      template <typename V>
      struct with
      {
	typedef count_<V> ret;
      };
    };

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# ifndef MLN_INCLUDE_ONLY

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    template <typename V>
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    count_<V>::count_()
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    {
      init();
    }

    template <typename V>
    void
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    count_<V>::init()
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    {
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      count__ = 0;
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    }

    template <typename V>
    void
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    count_<V>::take(const value&)
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    {
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      ++count__;
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    }

    template <typename V>
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    void
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    count_<V>::take(const count_<V>& other)
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    {
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      count__ += other.count__;
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    }

    template <typename V>
    std::size_t
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    count_<V>::to_result() const
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    {
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      return count__;
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    }

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    template <typename V>
    void
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    count_<V>::set_value(std::size_t c)
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    {
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      count__ = c;
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    }

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# endif // ! MLN_INCLUDE_ONLY

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  } // end of namespace mln::accu
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} // end of namespace mln


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#endif // ! MLN_ACCU_COUNT_HH