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in-package search v0.1.0
Library
Module
Module type
Parameter
Class
Class type
difference p xs ys
removes all elements from xs
which are less than or equal to some element in ys
, according to the partial order p
.
include BaseLazyPlus
include BatInterfaces.Monad
Monadic binding.
bind m f
executes first m
then f
, using the result of m
.
val return : 'a -> 'a m
Return a value, that is, put a value in the monad.
val zero : unit -> 'a m
val null : 'a m -> bool
null x implies that x is zero. If you do not want to or cannot answer whether a given x is zero, then null x should be false.
difference p xs ys
removes all elements from xs
which are less than or equal to some element in ys
, according to the partial order p
.
unique eq xs
removes duplicates according to the function cmp
.
maxima p xs
leaves only the maximal elements according to the partial order p
.
nub p xs ys
is the same as maxima, but some values might be treated as greater than others depending on their position in the collection.
For instance, with lists, we treat elements that occur earlier in the list as always greater than elements that occur later, otherwise we use p
. This is really just an optimisation: in order to retrieve any value from maxima p
xs
, the maxima
function will have had to seen every value. Not so with nub
.