package dolmen

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package dolmen
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Module to handle substitutions

type ('a, 'b) t

The type of substitutions from values of type 'a to values of type 'b.

val empty : ('a, 'b) t

The empty substitution

val is_empty : ('a, 'b) t -> bool

Test wether a substitution is empty

val iter : ('a -> 'b -> unit) -> ('a, 'b) t -> unit

Iterates over the bindings of the substitution.

val map : ('b -> 'c) -> ('a, 'b) t -> ('a, 'c) t

Maps the given function over bound values

val fold : ('a -> 'b -> 'c -> 'c) -> ('a, 'b) t -> 'c -> 'c

Fold over the elements

val merge : ('a -> 'b option -> 'c option -> 'd option) -> ('a, 'b) t -> ('a, 'c) t -> ('a, 'd) t

Merge two substitutions

val filter : ('a -> 'b -> bool) -> ('a, 'b) t -> ('a, 'b) t

Filter bindings base on a predicate.

val bindings : ('a, 'b) t -> ('a * 'b) list

Returns the list of bindings ofa substitution.

val exists : ('a -> 'b -> bool) -> ('a, 'b) t -> bool

Tests wether the predicate holds for at least one binding.

val for_all : ('a -> 'b -> bool) -> ('a, 'b) t -> bool

Tests wether the predicate holds for all bindings.

val hash : ('b -> int) -> ('a, 'b) t -> int
val compare : ('b -> 'b -> int) -> ('a, 'b) t -> ('a, 'b) t -> int
val equal : ('b -> 'b -> bool) -> ('a, 'b) t -> ('a, 'b) t -> bool

Comparison and hash functions, with a comparison/hash function on values as parameter

val print : (Stdlib.Format.formatter -> 'a -> unit) -> (Stdlib.Format.formatter -> 'b -> unit) -> Stdlib.Format.formatter -> ('a, 'b) t -> unit

Prints the substitution, using the given functions to print keys and values.

val debug : (Stdlib.Format.formatter -> 'a -> unit) -> (Stdlib.Format.formatter -> 'b -> unit) -> Stdlib.Format.formatter -> ('a, 'b) t -> unit

Prints the substitution, using the given functions to print keys and values, includign some debug info.

val choose : ('a, 'b) t -> 'a * 'b

Return one binding of the given substitution, or raise Not_found if the substitution is empty.

module type S = sig ... end
module Var : S with type 'a key = 'a id
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