Artem Pavlenko b75737fd6a Implement proj_transform caching using boost::unordered_map which allows calling find method with compatible key type.
In this case `std::pair<boost::string_view, boost::string_view>` avoiding potentially expensive temp string keys.
(TODO: In the future use c++20 `std::unordered_map::find` transparent keys facility)
2021-03-03 15:01:58 +00:00
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