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template<class SinglePassRange, class OutputIterator> OutputIterator unique_copy(const SinglePassRange& rng, OutputIterator out); template<class SinglePassRange, class OutputIterator, class BinaryPredicate> OutputIterator unique_copy(const SinglePassRange& rng, OutputIterator out, BinaryPredicate pred);
            unique_copy copies the
            first element of each sequence of duplicates encountered in rng to out.
          
            Equality is determined by the predicate if one is supplied, or by operator==()
            for SinglePassRange's
            value type.
          
            Defined in the header file boost/range/algorithm/unique_copy.hpp
          
For the non-predicate versions of unique:
SinglePassRange is
                a model of the Single
                Pass Range Concept.
              SinglePassRange is
                mutable.
              SinglePassRange's
                value type is a model of the EqualityComparableConcept.
              OutputIterator is
                a model of the OutputIteratorConcept.
              For the predicate versions of unique:
SinglePassRange is
                a model of the Single
                Pass Range Concept.
              SinglePassRange is
                mutable.
              BinaryPredicate is
                a model of the BinaryPredicateConcept.
              SinglePassRange's
                value type is convertible to BinaryPredicate's
                first argument type and to BinaryPredicate's
                second argument type.
              OutputIterator is
                a model of the OutputIteratorConcept.
              
            Linear. O(N)
            where N is distance(rng).
            Exactly distance(rng)
            comparisons are performed.