The functions below present the manipulation of polymorphic maps, as were provided by the Extlib PMap module.
They are similar in functionality to the functorized Make module, but the compiler cannot ensure that maps using different key ordering have different types: the responsibility of not mixing non-sensical comparison functions together is to the programmer. If in doubt, you should rather use the Make functor for additional safety.
val empty : ('a, 'b) tThe empty map, using compare as key comparison function.
val is_empty : ('a, 'b) t -> boolReturns true if the map is empty.
val create : ('a -> 'a -> int) -> ('a, 'b) tCreates a new empty map, using the provided function for key comparison.
val singleton : ?cmp:('a -> 'a -> int) -> 'a -> 'b -> ('a, 'b) tCreates a new map with a single binding.
val cardinal : ('a, 'b) t -> intReturn the number of bindings of a map.
add x y m returns a map containing the same bindings as m, plus a binding of x to y. If x was already bound in m, its previous binding disappears.
If x was already bound to some z that is physically equal to y, then the returned map is physically equal to m.
update k1 k2 v2 m replace the previous binding of k1 in m by k2 associated to v2. This is equivalent to add k2 v2 (remove k1) m, but more efficient in the case where k1 and k2 have the same key ordering. If k1 and k2 have the same key ordering and v2 is physically equal to the value k1 is bound to in m then the returned map will be physically equal to m
update_stdlib k f m returns a map containing the same bindings as m, except k has a new binding as determined by f: First, calculate y as f (find_opt k m). If y = Some v then k will be bound to v in the resulting map. Else k will not be bound in the resulting map. If v is physically equal to the value of the previous binding of k in m, then the returned map will be physically equal to m.
This function does the same thing as update in the stdlib, but has a different name for backwards compatibility reasons.
val find : 'a -> ('a, 'b) t -> 'bfind x m returns the current binding of x in m, or raises Not_found if no such binding exists.
val find_default : 'b -> 'a -> ('a, 'b) t -> 'bfind_default d x m returns the current binding of x in m, or the default value d if no such binding exists.
val find_first : ('a -> bool) -> ('a, 'b) t -> 'a * 'bfind_first f m returns the first binding (k, v) for which f k is true or raises Not_found if there is no such binding. f must be monotonically increasing, i.e. if k1 < k2 && f k1 is true then f k2 must also be true.
val find_first_opt : ('a -> bool) -> ('a, 'b) t -> ('a * 'b) optionfind_first_opt f m returns Some (k, v) for the first binding (k, v) for which f k is true or returns None if there is no such binding. f must be monotonically increasing, i.e. if k1 < k2 && f k1 is true then f k2 must also be true.
val find_last : ('a -> bool) -> ('a, 'b) t -> 'a * 'bfind_last f m returns the last binding (k, v) for which f k is true or raises Not_found if there is no such binding. f must be monotonically decreasing, i.e. if k1 < k2 && f k2 is true then f k1 must also be true.
val find_last_opt : ('a -> bool) -> ('a, 'b) t -> ('a * 'b) optionfind_last_opt f m returns Some (k, v) for the last binding (k, v) for which f k is true or returns None if there is no such binding. f must be monotonically decreasing, i.e. if k1 < k2 && f k2 is true then f k1 must also be true.
remove x m returns a map containing the same bindings as m, except for x which is unbound in the returned map. The returned map is physically equal to the passed one if x was already unbound.
remove_exn x m behaves like remove x m except that it raises an exception if x is unbound in m.
val mem : 'a -> ('a, 'b) t -> boolmem x m returns true if m contains a binding for x, and false otherwise.
val iter : ('a -> 'b -> unit) -> ('a, 'b) t -> unititer f m applies f to all bindings in map m. f receives the key as first argument, and the associated value as second argument. The order in which the bindings are passed to f is unspecified. Only current bindings are presented to f: bindings hidden by more recent bindings are not passed to f.
map f m returns a map with same domain as m, where the associated value a of all bindings of m has been replaced by the result of the application of f to a. The order in which the associated values are passed to f is unspecified.
Same as map, but the function receives as arguments both the key and the associated value for each binding of the map.
val fold : ('b -> 'c -> 'c) -> ('a, 'b) t -> 'c -> 'cfold f m a computes (f kN dN ... (f k1 d1 (f k0 d0 a))...), where k0,k1..kN are the keys of all bindings in m, and d0,d1..dN are the associated data. The order in which the bindings are presented to f is unspecified.
val foldi : ('a -> 'b -> 'c -> 'c) -> ('a, 'b) t -> 'c -> 'cSame as fold, but the function receives as arguments both the key and the associated value for each binding of the map.
val at_rank_exn : int -> ('a, 'b) t -> 'a * 'bat_rank_exn i m returns the (key,value) pair whose key is at rank i in m, that is the i-th element in increasing order of the keys (the 0-th element being the smallest key in m with its associated value).
filterv f m returns a map where only the values a of m such that f a = true remain. The bindings are passed to f in increasing order with respect to the ordering over the type of the keys.
filter f m returns a map where only the (key, value) pairs of m such that f key value = true remain. The bindings are passed to f in increasing order with respect to the ordering over the type of the keys. If f returns true for all bindings of m the returned map is physically equal to m.
filter_map f m combines the features of filter and map. It calls calls f key0 a0, f key1 a1, f keyn an where a0..an are the elements of m and key0..keyn the respective corresponding keys. It returns the map of (keyi, bi) pairs such as f keyi ai = Some bi (when f returns None, the corresponding element of m is discarded).
val choose : ('key, 'a) t -> 'key * 'aReturn one binding of the given map. Which binding is chosen is unspecified, but equal bindings will be chosen for equal maps.
val choose_opt : ('key, 'a) t -> ('key * 'a) optionReturn Some (k, v) for one binding (k, v) of the given map, if the map is not empty. Else, return None. Which binding is chosen is unspecified, but equal bindings will be chosen for equal maps.
val any : ('key, 'a) t -> 'key * 'aReturn one binding of the given map. The difference with choose is that there is no guarantee that equals elements will be picked for equal sets. This merely returns the quickest binding to get (O(1)).
split x m returns a triple (l, data, r), where l is the map with all the bindings of m whose key is strictly less than x; r is the map with all the bindings of m whose key is strictly greater than x; data is None if m contains no binding for x, or Some v if m binds v to x.
val min_binding : ('key, 'a) t -> 'key * 'aReturns the binding with the smallest key.
val min_binding_opt : ('key, 'a) t -> ('key * 'a) optionReturn Some (key, value) for the key, value pair with the smallest key, or None if the map is empty.
Return the binding with the smallest key along with the rest of the map.
val max_binding : ('key, 'a) t -> 'key * 'aReturns the binding with the largest key.
val max_binding_opt : ('key, 'a) t -> ('key * 'a) optionReturn Some (key, value) for the key, value pair with the largest key, or None if the map is empty.
Return the binding with the largest key along with the rest of the map.
Creates an enumeration for this map, enumerating (key, value) pairs with the keys in increasing order.
Creates an enumeration for this map, enumerating (key, value) pairs with the keys in decreasing order.
creates a map from an enumeration, using the specified function for key comparison or compare by default.
val for_all : ('a -> 'b -> bool) -> ('a, 'b) t -> boolTests whether all (key, value) pairs satisfy a predicate function.
val exists : ('a -> 'b -> bool) -> ('a, 'b) t -> boolTests whether some (key, value) pair satisfies a predicate function.
partition p m returns a pair of maps (m1, m2), where m1 contains all the bindings of s that satisfy the predicate p, and m2 is the map with all the bindings of s that do not satisfy p.
add_carry k v m adds the binding (k, v) to m, returning the new map and optionally the previous value bound to k.
modify k f m replaces the previous binding for k with f applied to that value. If k is unbound in m or Not_found is raised during the search, Not_found is raised.
modify_def v0 k f m replaces the previous binding for k with f applied to that value. If k is unbound in m or Not_found is raised during the search, f v0 is inserted (as if the value found were v0).
modify_opt k f m allow to modify the binding for k in m or absence thereof.
extract k m removes the current binding of k from m, returning the value k was bound to and the updated m.
pop m returns a binding from m and m without that binding.
union m1 m2 merges two maps, using the comparison function of m1. In case of conflicted bindings, m2's bindings override m1's. Equivalent to foldi add m2 m1. The resulting map uses the comparison function of m1.
diff m1 m2 removes all bindings of keys found in m2 from m1, using the comparison function of m1. Equivalent to foldi (fun k _v m -> remove k m) m2 m1. The resulting map uses the comparison function of m1.
intersect merge_f m1 m2 returns a map with bindings only for keys bound in both m1 and m2, and with k bound to merge_f
v1 v2, where v1 and v2 are k's bindings in m1 and m2. The resulting map uses the comparison function of m1.
val merge :
('key -> 'a option -> 'b option -> 'c option) ->
('key, 'a) t ->
('key, 'b) t ->
('key, 'c) tmerge f m1 m2 computes a map whose keys is a subset of keys of m1 and of m2. The presence of each such binding, and the corresponding value, is determined with the function f. The resulting map uses the comparison function of m1.
val merge_unsafe :
('key -> 'a option -> 'b option -> 'c option) ->
('key, 'a) t ->
('key, 'b) t ->
('key, 'c) tSame as merge, but assumes the comparison function of both maps are equal. If it's not the case, the result is a map using the comparison function of its first parameter, but which 'b option elements are passed to the function is unspecified.
union f m1 m2 computes a map whose keys are a subset of the keys of m1 and of m2. When the same binding is defined in both arguments, the function f is used to combine them. This function is similar to merge, except f is only called if a key is present in both m1 and m2. If a key is present in either m1 or m2 but not in both, it (and the corresponding value) will be present in the resulting map.
This is the union method from the stdlib map, renamed for backwards compatibility.
Iterate on the whole map, in ascending order of keys.
Iterate on the whole map, in descending order of keys.
to_seq_from k m iterates on a subset of the bindings in m, namely those bindings greater or equal to k, in ascending order.
add the given bindings to the map, in order.
build a map from the given bindings
Construct a comparison or equality function for maps based on a value comparison or equality function. Uses the key comparison function to compare keys.
module Exceptionless : sig ... endExceptionless versions of functions
val (-->) : ('a, 'b) t -> 'a -> 'bMap find and insert from Infix
val bindings : ('key, 'a) t -> ('key * 'a) listReturn the list of all bindings of the given map. The returned list is sorted in increasing key order.
Added for compatibility with stdlib 3.12
val print :
?first:string ->
?last:string ->
?sep:string ->
?kvsep:string ->
('a BatInnerIO.output -> 'b -> unit) ->
('a BatInnerIO.output -> 'c -> unit) ->
'a BatInnerIO.output ->
('b, 'c) t ->
unitval get_cmp : ('a, 'b) t -> 'a -> 'a -> intget the comparison function used for a polymorphic map