Reify a recursive data structure into an explicit graph.
|Version on this page:||0.6@rev:1|
|LTS Haskell 20.24:||0.6.3@rev:2|
|Stackage Nightly 2023-06-08:||0.6.3@rev:2|
|Latest on Hackage:||0.6.3@rev:2|
Module documentation for 0.6
'data-reify' provided the ability to turn recursive structures into explicit graphs.
Many (implicitly or explicitly) recursive data structure can be given this ability, via
a type class instance. This gives an alternative to using
Ref for observable sharing.
Observable sharing in general is unsafe, so we use the IO monad to bound this effect,
but can be used safely even with
unsafePerformIO if some simple conditions are met.
Typically this package will be used to tie the knot with DSL's that depend of
observable sharing, like Lava.
Providing an instance for
MuRef is the mechanism for allowing a structure to be
reified into a graph, and several examples of this are provided.
Version 0.1 used unsafe pointer compares.
Version 0.2 of 'data-reify' used
StableNames, and was much faster.
Version 0.3 provided two versions of
MuRef, the mono-typed version,
for trees of a single type,
and the dynamic-typed version, for trees of different types.
Version 0.4 used
Int as a synonym for
Unique rather than
for node ids, by popular demand.
Version 0.5 merged the mono-typed and dynamic version again, by using
DynStableName, an unphantomized version of StableName.
© 2009 Andy Gill; BSD3 license.