cartesianToCompressed changed to unordered multimap #687
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jenkins build this serial please |
bska
reviewed
Nov 7, 2023
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| retval.reserve(num_cells); | ||
| if (global_cell) { | ||
| for (int i = 0; i < num_cells; ++i) { | ||
| retval.insert(std::pair<int,int>(global_cell[i], i)); | ||
| } | ||
| } else { | ||
| for (int i = 0; i < num_cells; ++i) { | ||
| retval.insert(std::pair<int,int>(i, i)); | ||
| } | ||
| return retval; | ||
| } | ||
| return retval; |
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If you're changing this anyway, now would be a good time to switch to
retval.emplace(x, y)instead of
retval.insert(std::pair<int,int>(x, y))They do the same thing, effectively, but the former (.emplace()) is (slightly) faster since it constructs the value in-place.
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Thanks for your feedback! Indeed, unordered_map<int, std::vector> is an alternative too. I'll check it out.
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| for (const auto pair : cartesian_to_compressed) | ||
| { | ||
| std::cout << pair.first << " " << pair.second << '\n'; | ||
| } |
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Is this code left over from development? If so, I think we should remove it.
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Opps! Yes, that was supposed to be removed. Thanks for noticing!
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When a CpGrid has LGRs, a Cartesian index (key) is associated to more than one compressed index (value). Therefore, this unordered_map now has been replaced by an unordered_multimap, to support multiple value with a same key.