tezos-error-monad

Tezos: error monad
package tezos-error-monad
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Library tezos-error-monad
Module Tezos_error_monad . Monad_maker . Make . Monad . Option_syntax
val return : 'a -> 'a option

return x is Some x.

val fail : 'a option

fail is None. It is also an alias for Option.none.

val return_unit : unit option

return_unit is Some ().

val return_nil : 'a list option

return_nil is Some [].

val return_true : bool option

return_true is Some true.

val return_false : bool option

return_false is Some false.

Note that we do not provide return_some nor return_none. Both of these functions are possible but somewhat confusing and rarely useful in practice. If you need to carry options within a Option-monad computation (yielding to values of the type 'a option option), you need to do so by hand: return (Some …) and return None.

val let* : 'a option -> ( 'a -> 'b option ) -> 'b option

let* is a binding operator alias for Option.bind.

val and* : 'a option -> 'b option -> ('a * 'b) option

and* is a binding operator alias for both.

val let+ : 'a option -> ( 'a -> 'b ) -> 'b option

let+ is a binding operator alias for Option.map.

val and+ : 'a option -> 'b option -> ('a * 'b) option

and+ is a binding operator alias for both.

val both : 'a option -> 'b option -> ('a * 'b) option

both is the joining of two optional non-unit values. both a b is Some (x, y) iff a is Some x and b is Some y.