package ppx_repr

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PPX deriver for type representations

Install

Dune Dependency

github.com Readme Changelog ISC License Edit opam file Versions (8)

Authors

Maintainers

T

thomas@gazagnaire.org

Sources

repr-fuzz-0.3.0.tbz

sha256=d9bd2fe51c2eb6fca27731034c46f9a77dc8bc9fb7b76216f8a571603d6e7d74

sha512=7b4ad2cbcd92f6647a1abe1d82557f02e4955c5f37f02089388c752e23b865af0f55fdd6bc63a1d2a00962baf96ccd99ccd9b8ecd8898dcc2a0cd17302f067c3

doc/ppx_repr.lib/Ppx_repr_lib/Utils/Option/index.html

Module `Utils.Option`Source

include module type of struct include Option end

Options

Sourcetype 'a t = 'a option =

| None
| Some of 'a

The type for option values. Either None or a value Some v.

Sourceval none : 'a option

none is None.

Sourceval some : 'a -> 'a option

some v is Some v.

Sourceval value : 'a option -> default:'a -> 'a

value o ~default is v if o is Some v and default otherwise.

Sourceval get : 'a option -> 'a

get o is v if o is Some v and raise otherwise.

raises Invalid_argument
if o is None.

Sourceval bind : 'a option -> ('a -> 'b option) -> 'b option

bind o f is f v if o is Some v and None if o is None.

Sourceval join : 'a option option -> 'a option

join oo is Some v if oo is Some (Some v) and None otherwise.

Sourceval map : ('a -> 'b) -> 'a option -> 'b option

map f o is None if o is None and Some (f v) if o is Some v.

Sourceval fold : none:'a -> some:('b -> 'a) -> 'b option -> 'a

fold ~none ~some o is none if o is None and some v if o is Some v.

Sourceval iter : ('a -> unit) -> 'a option -> unit

iter f o is f v if o is Some v and () otherwise.

Predicates and comparisons

Sourceval is_none : 'a option -> bool

is_none o is true if and only if o is None.

Sourceval is_some : 'a option -> bool

is_some o is true if and only if o is Some o.

Sourceval equal : ('a -> 'a -> bool) -> 'a option -> 'a option -> bool

equal eq o0 o1 is true if and only if o0 and o1 are both None or if they are Some v0 and Some v1 and eq v0 v1 is true.

Sourceval compare : ('a -> 'a -> int) -> 'a option -> 'a option -> int

compare cmp o0 o1 is a total order on options using cmp to compare values wrapped by Some _. None is smaller than Some _ values.

Converting

Sourceval to_result : none:'e -> 'a option -> ('a, 'e) result

to_result ~none o is Ok v if o is Some v and Error none otherwise.

Sourceval to_list : 'a option -> 'a list

to_list o is [] if o is None and [v] if o is Some v.

Sourceval to_seq : 'a option -> 'a Seq.t

to_seq o is o as a sequence. None is the empty sequence and Some v is the singleton sequence containing v.

Sourceval to_bool : unit option -> bool