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/* -*- c++ -*- */
/*
* Copyright 2004,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#include <gnuradio/trellis/quicksort_index.h>
namespace gr {
namespace trellis {
template <class T>
void SWAP(T& a, T& b)
{
T temp = a;
a = b;
b = temp;
}
template <class T>
void quicksort_index(std::vector<T>& p, std::vector<int>& index, int left, int right)
{
if (left < right) {
int i = left;
int j = right + 1;
T pivot = p[left];
do {
do
i++;
while ((p[i] < pivot) && (i < right));
do
j--;
while ((p[j] > pivot) && (j > left));
if (i < j) {
SWAP<T>(p[i], p[j]);
SWAP<int>(index[i], index[j]);
}
} while (i < j);
SWAP<T>(p[left], p[j]);
SWAP<int>(index[left], index[j]);
quicksort_index<T>(p, index, left, j - 1);
quicksort_index<T>(p, index, j + 1, right);
}
}
// instantiate an <int> version of the quicksort_index
// template <int> void SWAP (int & a, int & b);
template void
quicksort_index<int>(std::vector<int>& p, std::vector<int>& index, int left, int right);
} /* namespace trellis */
} /* namespace gr */
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