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BSD-3-Clause licensed by Alexey Rodriguez,
Stefan Holdermans,
Andres Löh,
Johan Jeuring
The Zipper is a data structure that allows typed navigation on a value.
It maintains a subterm as a current point of focus. The rest of the value
is the context. Focus and context are automatically updated when navigating
up, down, left or right in the value. The term that is in focus can also
be modified.
This library offers a generic Zipper for families of datatypes. In particular,
it is possible to move the focus between subterms of different types, in an
entirely type-safe way. This library is built on top of the multirec library,
so all that is required to get a Zipper for a datatype family is to instantiate
the multirec library for that family.
