Map difference #12
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Map difference #12
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mlemerre
reviewed
Jul 22, 2024
src/signatures.ml
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| val slow_merge : ('map1, 'map2, 'map3) polymerge -> 'map1 t -> 'map2 t -> 'map3 t | ||
| (** This is the same as {{: https://ocaml.org/api/Map.S.html#VALmerge}Stdlib.Map.S.merge} *) | ||
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| val difference: ('a, 'a, 'a) polyinterfilter -> 'a t -> 'a t -> 'a t |
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Maybe we should have type 'a difference = ('a,'a,'a) polyinterfilter?
src/signatures.ml
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| val slow_merge : ('map1, 'map2, 'map3) polymerge -> 'map1 t -> 'map2 t -> 'map3 t | ||
| (** This is the same as {{: https://ocaml.org/api/Map.S.html#VALmerge}Stdlib.Map.S.merge} *) | ||
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| val difference: ('a, 'a, 'a) polyinterfilter -> 'a t -> 'a t -> 'a t | ||
| (** [difference f map1 map2] returns a map comprising of the bindings |
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Maybe name this symmetric_difference? If I understood well what this function does
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Oh yes that's not a bad idea
src/signatures.ml
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| @@ -507,6 +531,13 @@ module type HETEROGENEOUS_MAP = sig | |||
| {!update_multiple_from_foreign}, except that instead of updating for all | |||
| keys in [m_from], it only updates for keys that are both in [m_from] and | |||
| [m_to]. *) | |||
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| val domain_difference: 'a t -> 'b Map2.t -> 'a t | |||
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And this would be just difference
src/functors.ml
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| let rec domain_difference ta tb = | ||
| match NODE.view ta, NODE.view tb with | ||
| | Empty, _ | _, Empty -> ta | ||
| | Leaf{key;_},_ -> if mem key tb then empty else ta |
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Should we use a function on the values to know if we want to remove the binding or not?
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Add two difference functions:
domain_difference m1 m2which is justm1restricted to elements that don't appear inm2. On set, this is theStdlib'sdifffunction. Also defined forWithForeignoperations.difference f m1 m2which returns the set of bindings that differ inm1andm2, combining bindings present in both withf.