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option

§
option
(T
type
)
:
switch T, nil,monad T, option T,equatable
[Contains abstract features]

[Module base]
[src]

option -- feature wrapping a value or nothing

option represents an optional value of type T

Type Parameters

T

:

[Module base]

Functions

(K

type

, f Unary K Sequence.T)

=>

lock_free.map K (list Sequence.T)

[Inherited from Sequence]

group the elements of this sequence by a key of type K

f determines the key of an element