These notes are meant to help developers and contributors with regards to some details of the implementation and coding style of the project.
The C++ codebase currently targets C++11 compliance. It is header-only since one of the focus of the library is speed.
Python bindings targets Python 3.7 and above. The bindings are hand-written and relies on cppy (https://github.com/nucleic/cppy). Kiwisolver tries to use a reasonably modern C API and to support sub-interpreter, this has a couple of consequences:
all the non exported symbol are enclosed in anonymous namespaces
kiwisolver does not use static types and only dynamical types (note that the type slots and related structures are stored in a static variable)
modules use the multi-phases initialization mechanism as defined in PEP 489 – Multi-phase extension module initialization
static variables use is limited to type slots, method def