Make API creation foolproof
sion_generic_create_api creates an API that is in a completely invalid state and the various
sion_generic_register... functions all register a single callback function, leaving the API again in an invalid state until all necessary callbacks have been registered. Why not have
sion_generic_create_api take all necessary callbacks as an argument and create a valid API descriptor in a single step?
As there seem to be different levels of capability that require fewer or more callbacks to be defined, there could be several
create functions, one per level or, a single
create function that accepts
NULL for optional callbacks and sets the correct capability level.
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