uniq

auto uniq(alias  pred =  "a == b",  Range)(Range r) if (isInputRange!Range &&  is(typeof(binaryFun!pred(r.front,  r.front))  ==  bool))

Lazily iterates unique consecutive elements of the given range, which is assumed to be sorted (functionality akin to the

_uniq system

utility). Equivalence of elements is assessed by using the predicate pred, by default "a == b". The predicate is passed to

binaryFun, and can either accept a string, or any callable

that can be executed via pred(element, element). If the given range is bidirectional, uniq also yields a

`pred`	Predicate for determining equivalence between range elements.
`r`	An input range of elements to filter.

consecutively unique elements in the original range. If r is also a forward range or bidirectional range, the returned range will be likewise.