Function unflattenList

extern/happly/happly.h:243–261

// Unpack flattened list from the convention used in TypedListProperty
template <typename T>
std::vector<std::vector<T>> unflattenList(const std::vector<T>& flatList, const std::vector<size_t> flatListStarts) {
  size_t outerCount = flatListStarts.size() - 1;

  // Put the output here
  std::vector<std::vector<T>> outLists(outerCount);

  if (outerCount == 0) {
    return outLists; // quick out for empty
  }

  // Copy each sublist
  for (size_t iOuter = 0; iOuter < outerCount; iOuter++) {
    size_t iFlatStart = flatListStarts[iOuter];
    size_t iFlatEnd = flatListStarts[iOuter + 1];
    outLists[iOuter].insert(outLists[iOuter].begin(), flatList.begin() + iFlatStart, flatList.begin() + iFlatEnd);
  }

  return outLists;
}


}; // namespace