Revision 2a37790e475d089154fa08c65eb4997c76a72a17 authored by Simon Giraudot on 21 December 2016, 12:50:18 UTC, committed by Simon Giraudot on 21 December 2016, 12:50:18 UTC
1 parent fb9aae7
random_selection.h
// Copyright (c) 1997
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); 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 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Lutz Kettner <kettner@inf.ethz.ch>
#ifndef CGAL_RANDOM_SELECTION_H
#define CGAL_RANDOM_SELECTION_H 1
#include <cstddef>
#include <iterator>
#include <CGAL/Random.h>
namespace CGAL {
template <class RandomAccessIterator, class Size, class OutputIterator,
class Random>
OutputIterator random_selection( RandomAccessIterator first,
RandomAccessIterator last,
Size n,
OutputIterator result,
Random& rnd)
// choose a random item from the range [`first',`last') and write it
// to `result', each item from the range with equal probability.
// Repeat this n times, thus writing n items to `result'. A single
// random number is needed from `rnd' for each item. Returns the
// value of `result' after inserting the n items.
{
std::ptrdiff_t m = last - first;
for ( Size i = 0; i < n; i++) {
*result++ = first[ rnd(m)];
}
return result;
}
template <class RandomAccessIterator, class Size, class OutputIterator>
OutputIterator random_selection( RandomAccessIterator first,
RandomAccessIterator last,
Size n,
OutputIterator result)
{
return random_selection( first, last, n, result, get_default_random());
}
} //namespace CGAL
#endif // CGAL_RANDOM_SELECTION_H //
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