module Exceptionless: sig .. end
Exceptionless counterparts for error-raising operations
val find : ('a -> bool) -> 'a list -> 'a option
find p l returns Some x where x is the first element
of l such as p x returns true or None if such an
element has not been found.
val rfind : ('a -> bool) -> 'a list -> 'a option
rfind p l returns Some x where x is the last element of l
such
that p x returns true or None if such element as not been found.
val findi : (int -> 'a -> bool) -> 'a list -> (int * 'a) option
findi p e l returns Some (i, ai) where ai and i are
respectively the
first element of l and its index, such that p i ai is true,
or None if no such element has been found.
val split_at : int -> 'a list -> [ `Invalid_argument of string | `Ok of 'a list * 'a list ]
Whenever n is inside of l size bounds, split_at n l returns
Ok(l1,l2), where l1 contains the first n elements of l and l2
contains the others. Otherwise, returns `Invalid_argument n
val at : 'a list -> int -> [ `Invalid_argument of string | `Ok of 'a ]
If n is inside the bounds of l, at l n returns Ok x, where
x is the n-th element of the list l. Otherwise, returns Error
(`Invalid_argument(n)).
val assoc : 'a -> ('a * 'b) list -> 'b option
assoc a l returns Some b where b is the value associated with
key b
in the list of pairs l. That is, assoc a [ ...; (a,b); ...] = Some b
if (a,b) is the leftmost binding of a in list l.
Return None if there is no value associated with a in the
list l.
val assoc_inv : 'b -> ('a * 'b) list -> 'a option
assoc_inv b l returns Some a where a is the key associated with
value b
in the list of pairs l. That is, assoc b [ ...; (a,b); ...] = Some a
if (a,b) is the leftmost binding of a in list l.
Return None if there is no key associated with b in the
list l.
val assq : 'a -> ('a * 'b) list -> 'b option
val find_map : ('a -> 'b option) -> 'a list -> 'b option
find_map f xs returns Some y such that x is the first
element of the list where f x returns Some y. It returns None
if no such element exists.
val hd : 'a list -> 'a option
hd l returns Some x such that x is the first element of the given
list l.
Returns None if list l is empty.
val tl : 'a list -> 'a list option
tl l returns Some x such that x is the given list l without its
first element.
Returns None if list l is empty
val last : 'a list -> 'a option
last l returns either Some x where x is the last element of the list, or None if
the list is empty. This function takes linear time.