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51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2021 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////
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/*
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Reduce N times while excluding ith input element
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Copyright 2018 Ahmet Inan <inan@aicodix.de>
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*/
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#ifndef EXCLUSIVE_REDUCE_HH
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#define EXCLUSIVE_REDUCE_HH
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namespace ldpctool {
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namespace CODE {
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template <typename TYPE, typename OPERATOR>
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void exclusive_reduce(const TYPE *in, TYPE *out, int N, OPERATOR op)
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{
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TYPE pre = in[0];
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for (int i = 1; i < N-1; ++i) {
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out[i] = pre;
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pre = op(pre, in[i]);
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}
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out[N-1] = pre;
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TYPE suf = in[N-1];
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for (int i = N-2; i > 0; --i) {
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out[i] = op(out[i], suf);
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suf = op(suf, in[i]);
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}
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out[0] = suf;
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}
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} // namespace CODE
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} // namespace ldpctool
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#endif
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