`remove` removes from `rng` all of the elements `x` for which `x == val` is `true`. The versions of `remove` that return an iterator, return an iterator `new_last` such that the range `[begin(rng), new_last)` contains no elements equal to `val`. The `range_return` versions of `remove` defines `found` as the new last element. The iterators in the range `[new_last, end(rng))` are dereferenceable, but the elements are unspecified.
[heading Definition]
Defined in the header file `boost/range/algorithm/remove.hpp`
[heading Requirements]
* `ForwardRange` is a model of the __forward_range__ Concept.
* `ForwardRange` is mutable.
* `Value` is a model of the `EqualityComparableConcept`.
* Objects of type `Value` can be compared for equality with objects of `ForwardRange`'s value type.
[heading Complexity]
Linear. `remove` performs exactly `distance(rng)` comparisons for equality.
