package frama-c

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Platform dedicated to the analysis of source code written in C

Install

dune-project

Dependency

frama-c.com Readme Edit opam file Versions (25)

Authors

Maintainers

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frama-ci-bot@frama-c.com

Sources

frama-c-31.0-Gallium.tar.gz

sha256=a94384f00d53791cbb4b4d83ab41607bc71962d42461f02d71116c4ff6dca567

doc/frama-c.kernel/Frama_c_kernel/Result/index.html

Module `Frama_c_kernel.Result`

Adding let binding operators to the Result module.

see https://v2.ocaml.org/manual/bindingops.html
This module does not use the generic monad interface (cf. Monad) because of the error type, which would require another layer of functors.

include module type of Result

Results

type ('a, 'e) t = ('a, 'e) result =

| Ok of 'a
| Error of 'e

The type for result values. Either a value Ok v or an error Error e.

val ok : 'a -> ('a, 'e) result

ok v is Ok v.

val error : 'e -> ('a, 'e) result

error e is Error e.

val value : ('a, 'e) result -> default:'a -> 'a

value r ~default is v if r is Ok v and default otherwise.

val get_ok : ('a, 'e) result -> 'a

get_ok r is v if r is Ok v and raise otherwise.

raises Invalid_argument
if r is Error _.

val get_error : ('a, 'e) result -> 'e

get_error r is e if r is Error e and raise otherwise.

raises Invalid_argument
if r is Ok _.

val bind : ('a, 'e) result -> ('a -> ('b, 'e) result) -> ('b, 'e) result

bind r f is f v if r is Ok v and r if r is Error _.

val join : (('a, 'e) result, 'e) result -> ('a, 'e) result

join rr is r if rr is Ok r and rr if rr is Error _.

val map : ('a -> 'b) -> ('a, 'e) result -> ('b, 'e) result

map f r is Ok (f v) if r is Ok v and r if r is Error _.

val map_error : ('e -> 'f) -> ('a, 'e) result -> ('a, 'f) result

map_error f r is Error (f e) if r is Error e and r if r is Ok _.

val fold : ok:('a -> 'c) -> error:('e -> 'c) -> ('a, 'e) result -> 'c

fold ~ok ~error r is ok v if r is Ok v and error e if r is Error e.

val iter : ('a -> unit) -> ('a, 'e) result -> unit

iter f r is f v if r is Ok v and () otherwise.

val iter_error : ('e -> unit) -> ('a, 'e) result -> unit

iter_error f r is f e if r is Error e and () otherwise.

Predicates and comparisons

val is_ok : ('a, 'e) result -> bool

is_ok r is true if and only if r is Ok _.

val is_error : ('a, 'e) result -> bool

is_error r is true if and only if r is Error _.

val equal : 
  ok:('a -> 'a -> bool) ->
  error:('e -> 'e -> bool) ->
  ('a, 'e) result ->
  ('a, 'e) result ->
  bool

equal ~ok ~error r0 r1 tests equality of r0 and r1 using ok and error to respectively compare values wrapped by Ok _ and Error _.

val compare : 
  ok:('a -> 'a -> int) ->
  error:('e -> 'e -> int) ->
  ('a, 'e) result ->
  ('a, 'e) result ->
  int

compare ~ok ~error r0 r1 totally orders r0 and r1 using ok and error to respectively compare values wrapped by Ok _ and Error _. Ok _ values are smaller than Error _ values.

Converting

val to_option : ('a, 'e) result -> 'a option

to_option r is r as an option, mapping Ok v to Some v and Error _ to None.

val to_list : ('a, 'e) result -> 'a list

to_list r is [v] if r is Ok v and [] otherwise.

val to_seq : ('a, 'e) result -> 'a Seq.t

to_seq r is r as a sequence. Ok v is the singleton sequence containing v and Error _ is the empty sequence.

val zip : ('a, 'e) result -> ('b, 'e) result -> ('a * 'b, 'e) result

zip r1 r2 regroups values in a pair Ok (v1, v2) if both arguments are Ok v1 and Ok v2 and propagate errors in other cases. If both r1 and r2 are errors we keep the first one, in this case r1.

module Operators : sig ... end