High Dimensional Map for C++.
hdmap is a sparse compact spatial data structure that supports finding, updating and erasing voxels in specified axis-aligned bounding box region.
hdmap is implemented as header-only library, so it is easy to embed anywhere.
C++ compiler that supports C++20 or higher.
Boost : Container, Integer and Unit Test Framework (for tests) are needed.
(Optional) Nlohmann JSON : Needed to serialize the data structure into JSON.