h3oh3o — H3 on H3O

Design

This crate wraps the H3O library and expose a C API that can be used as a drop in replacement for the H3 reference implementation.

Note that while the exposed API itself exacly matches the reference one, from a behavioral point of view there are some differences (that shouldn't matter in most cases but still: be aware of it).

For instances:

• when a function fails, the error code may differ between h3 and h3oh3o
• due to the current implementation of h3's compactCells, some duplicates in the input may go undetected: h3oh3o will detect them and returns an error.
• stringToH3 does no validity check on its input (beyond "is it an integer"), whereas h3oh3o ensure the parsed index's validity.
• when the resolution given to cellToChildrenSize is coarser than the cell's one, h3 returns an error where h3oh3o returns a count of 0.
• …

Usage

To use h3oh3o as a C library in an external project, simply add the following snippet to your CMakeLists.txt

# Include the H3OH3O library, fetch it if not locally available.
include(FetchContent)
FetchContent_Declare(
    h3oh3o
    GIT_REPOSITORY https://github.com/HydroniumLabs/h3oh3o.git
    FIND_PACKAGE_ARGS
)
FetchContent_MakeAvailable(h3oh3o)

And then

target_link_libraries(your_target PUBLIC h3oh3o::h3oh3o)

License

BSD 3-Clause