Created
October 1, 2011 20:51
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template <typename uint_t> | |
uint_t | |
PointKDTreeImplImpl<uint_t>::partitionAroundMedian( | |
uint_t idxBegin, | |
uint_t idxEnd, | |
KDTreeAxis axis) | |
{ | |
uint_t halfSize = (idxEnd - idxBegin) / 2; | |
uint_t idxMedian = idxBegin + halfSize; | |
auto itGlobalBegin = begin(m_arrPoints); | |
auto itBegin = itGlobalBegin + static_cast<size_t>(idxBegin); | |
auto itMedian = itGlobalBegin + static_cast<size_t>(idxMedian); | |
auto itEnd = itGlobalBegin + static_cast<size_t>(idxEnd); | |
nth_element(itBegin, itMedian, itEnd, | |
[=](const V3x& lhs, const V3x& rhs) -> bool { | |
return lhs[axis] < rhs[axis]; | |
}); | |
return idxMedian; | |
} |
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