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35 lines
604 B
C++
35 lines
604 B
C++
/*
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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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