include/opencv2/flann/dynamic_bitset.h

Go to the documentation of this file.

/***********************************************************************
 * Software License Agreement (BSD License)
 *
 * Copyright 2008-2009  Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
 * Copyright 2008-2009  David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
 *
 * THE BSD LICENSE
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *************************************************************************/

/***********************************************************************
 * Author: Vincent Rabaud
 *************************************************************************/

#ifndef OPENCV_FLANN_DYNAMIC_BITSET_H_
#define OPENCV_FLANN_DYNAMIC_BITSET_H_

#ifndef FLANN_USE_BOOST
#  define FLANN_USE_BOOST 0
#endif
//#define FLANN_USE_BOOST 1
#if FLANN_USE_BOOST
#include <boost/dynamic_bitset.hpp>
typedef boost::dynamic_bitset<> DynamicBitset;
#else

#include <limits.h>

#include "dist.h"

namespace cvflann {

class DynamicBitset
{
public:
    DynamicBitset()
    {
    }

    DynamicBitset(size_t sz)
    {
        resize(sz);
        reset();
    }

    void clear()
    {
        std::fill(bitset_.begin(), bitset_.end(), 0);
    }

    bool empty() const
    {
        return bitset_.empty();
    }

    void reset()
    {
        std::fill(bitset_.begin(), bitset_.end(), 0);
    }

    void reset(size_t index)
    {
        bitset_[index / cell_bit_size_] &= ~(size_t(1) << (index % cell_bit_size_));
    }

    void reset_block(size_t index)
    {
        bitset_[index / cell_bit_size_] = 0;
    }

    void resize(size_t sz)
    {
        size_ = sz;
        bitset_.resize(sz / cell_bit_size_ + 1);
    }

    void set(size_t index)
    {
        bitset_[index / cell_bit_size_] |= size_t(1) << (index % cell_bit_size_);
    }

    size_t size() const
    {
        return size_;
    }

    bool test(size_t index) const
    {
        return (bitset_[index / cell_bit_size_] & (size_t(1) << (index % cell_bit_size_))) != 0;
    }

private:
    std::vector<size_t> bitset_;
    size_t size_;
    static const unsigned int cell_bit_size_ = CHAR_BIT * sizeof(size_t);
};

} // namespace cvflann

#endif

#endif // OPENCV_FLANN_DYNAMIC_BITSET_H_