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template<class ForwardRange> typename range_return<ForwardRange, return_begin_found>::type unique(ForwardRange& rng); template<class ForwardRange> typename range_return<const ForwardRange, return_begin_found>::type unique(const ForwardRange& rng); template<class ForwardRange, class BinaryPredicate> typename range_return<ForwardRange, return_begin_found>::type unique(ForwardRange& rng, BinaryPredicate pred); template<class ForwardRange, class BinaryPredicate> typename range_return<const ForwardRange, return_begin_found>::type unique(const ForwardRange& rng, BinaryPredicate pred); template<range_return_value re, class ForwardRange> typename range_return<ForwardRange, re>::type unique(ForwardRange& rng); template<range_return_value re, class ForwardRange> typename range_return<const ForwardRange, re>::type unique(const ForwardRange& rng); template<range_return_value re, class ForwardRange, class BinaryPredicate> typename range_return<ForwardRange, re>::type unique(ForwardRange& rng, BinaryPredicate pred); template<range_return_value re, class ForwardRange, class BinaryPredicate> typename range_return<const ForwardRange, re>::type unique(const ForwardRange& rng, BinaryPredicate pred);
            unique removes all but
            the first element of each sequence of duplicate encountered in rng.
          
            Elements in the range [new_last,
            end(rng))
            are dereferenceable but undefined.
          
            Equality is determined by the predicate if one is supplied, or by operator==()
            for ForwardRange's value
            type.
          
            Defined in the header file boost/range/algorithm/unique.hpp
          
For the non-predicate versions of unique:
ForwardRange is a
                model of the Forward
                Range Concept.
              ForwardRange is mutable.
              ForwardRange's value
                type is a model of the EqualityComparableConcept.
              For the predicate versions of unique:
ForwardRange is a
                model of the Forward
                Range Concept.
              ForwardRange is mutable.
              BinaryPredicate is
                a model of the BinaryPredicateConcept.
              ForwardRange's value
                type is convertible to BinaryPredicate's
                first argument type and to BinaryPredicate's
                second argument type.
              
            Linear. O(N)
            where N is distance(rng).
            Exactly distance(rng)
            comparisons are performed.