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Diffstat (limited to 'engine/logic_monad.mli')
| -rw-r--r-- | engine/logic_monad.mli | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/engine/logic_monad.mli b/engine/logic_monad.mli index 42e49d5a7..1869f3263 100644 --- a/engine/logic_monad.mli +++ b/engine/logic_monad.mli @@ -115,6 +115,13 @@ module BackState : sig val get : ('s, 's, 's, 'e) t val modify : ('i -> 'o) -> (unit, 'i, 'o, 'e) t + val interleave : ('e1 -> 'e2) -> ('e2 -> 'e1) -> ('a, 'i, 'o, 'e1) t -> + ('a, 'i, 'o, 'e2) t + (** [interleave src dst m] adapts the exceptional content of the monad + according to the functions [src] and [dst]. To ensure a meaningful result, + those functions must form a retraction, i.e. [dst (src e1) = e1] for all + [e1]. This is typically the case when the type ['e1] is [unit]. *) + val zero : 'e -> ('a, 'i, 'o, 'e) t val plus : ('a, 'i, 'o, 'e) t -> ('e -> ('a, 'i, 'o, 'e) t) -> ('a, 'i, 'o, 'e) t |