sorting.h

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/* Copyright (C) 2003-2012 Oliver Lemke  <olemke@core-dump.info>

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.

   This program 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 program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA.
   */

//   File description

#ifndef sorting_h
#define sorting_h

#include <algorithm>
#include <functional>

#include "array.h"
#include "matpack.h"

template <typename T>
class IndexComp : public binary_function<Index, Index, bool> {
  const T& m_data;

 public:
  explicit IndexComp(const T& data) : m_data(data) {}

  bool operator()(Index a, Index b) const { return (m_data[a] < m_data[b]); }
};

template <typename T>
void get_sorted_indexes(ArrayOfIndex& sorted, const T& data) {
  sorted.resize(0);

  Index i = 0;
  for (typename T::const_iterator it = data.begin(); it != data.end(); ++it) {
    sorted.push_back(i);
    i++;
  }

  sort(sorted.begin(), sorted.end(), IndexComp<T>(data));
}

#endif /* sorting_h */