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### Header <boost/algorithm/cxx11/one_of.hpp>

Test ranges to see if only one element matches a value or predicate.

Marshall Clow

    namespace boost {
      namespace algorithm {
        template<typename InputIterator, typename Predicate>
          bool one_of(InputIterator, InputIterator, Predicate);
        template<typename Range, typename Predicate>
          bool one_of(const Range &, Predicate);
        template<typename InputIterator, typename V>
          bool one_of_equal(InputIterator, InputIterator, const V &);
        template<typename Range, typename V>
          bool one_of_equal(const Range &, const V &);
      }
    }