iterator.hpp

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        }
        BOOST_UBLAS_INLINE
        friend reverse_iterator_base operator + (difference_type n, const reverse_iterator_base &it) {
            reverse_iterator_base tmp (it);
            return tmp += n;
        }
        BOOST_UBLAS_INLINE
        friend reverse_iterator_base operator - (const reverse_iterator_base &it, difference_type n) {
            reverse_iterator_base tmp (it);
            return tmp -= n;
        }
        BOOST_UBLAS_INLINE
        friend difference_type operator - (const reverse_iterator_base &it1, const reverse_iterator_base &it2) {
            return it2.base () - it1.base ();
        }

        BOOST_UBLAS_INLINE
        const container_type &operator () () const {
            return this->base () ();
        }

        BOOST_UBLAS_INLINE
        size_type index () const {
            iterator_type tmp (this->base ());
            return (-- tmp).index ();
        }
    };

  /** \brief 1st base class of all matrix reverse iterators. (non-MSVC version)
   *
   * \param I the derived iterator type
   *
   * The reverse iterator implements a bidirectional iterator
   * reversing the elements of the underlying iterator. It
   * implements most operators of a random access iterator.
   *
   * uBLAS extension: it.index1(), it.index2() and access to
   * the dual iterator via begin(), end(), rbegin(), rend()
   */

    // Renamed this class from reverse_iterator1 to get
    // typedef reverse_iterator1<...> reverse_iterator1
    // working. Thanks to Gabriel Dos Reis for explaining this.
    template <class I>
    class reverse_iterator_base1:
        public std::reverse_iterator<I> {
    public:
        typedef typename I::container_type container_type;
        typedef typename container_type::size_type size_type;
        typedef typename I::difference_type difference_type;
        typedef I iterator_type;
        typedef typename I::dual_iterator_type dual_iterator_type;
        typedef typename I::dual_reverse_iterator_type dual_reverse_iterator_type;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 ():
            std::reverse_iterator<iterator_type> () {}
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 (const iterator_type &it):
            std::reverse_iterator<iterator_type> (it) {}

        // Arithmetic
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 &operator ++ () {
            return *this = -- this->base ();
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 operator ++ (int) {
            reverse_iterator_base1 tmp (*this);
            *this = -- this->base ();
            return tmp;
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 &operator -- () {
            return *this = ++ this->base ();
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 operator -- (int) {
            reverse_iterator_base1 tmp (*this);
            *this = ++ this->base ();
            return tmp;
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 &operator += (difference_type n) {
            return *this = this->base () - n;
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base1 &operator -= (difference_type n) {
            return *this = this->base () + n;
        }

        BOOST_UBLAS_INLINE
        friend reverse_iterator_base1 operator + (const reverse_iterator_base1 &it, difference_type n) {
            reverse_iterator_base1 tmp (it);
            return tmp += n;
        }
        BOOST_UBLAS_INLINE
        friend reverse_iterator_base1 operator + (difference_type n, const reverse_iterator_base1 &it) {
            reverse_iterator_base1 tmp (it);
            return tmp += n;
        }
        BOOST_UBLAS_INLINE
        friend reverse_iterator_base1 operator - (const reverse_iterator_base1 &it, difference_type n) {
            reverse_iterator_base1 tmp (it);
            return tmp -= n;
        }
        BOOST_UBLAS_INLINE
        friend difference_type operator - (const reverse_iterator_base1 &it1, const reverse_iterator_base1 &it2) {
            return it2.base () - it1.base ();
        }

        BOOST_UBLAS_INLINE
        const container_type &operator () () const {
            return this->base () ();
        }

        BOOST_UBLAS_INLINE
        size_type index1 () const {
            iterator_type tmp (this->base ());
            return (-- tmp).index1 ();
        }
        BOOST_UBLAS_INLINE
        size_type index2 () const {
            iterator_type tmp (this->base ());
            return (-- tmp).index2 ();
        }

        BOOST_UBLAS_INLINE
        dual_iterator_type begin () const {
            iterator_type tmp (this->base ());
            return (-- tmp).begin ();
        }
        BOOST_UBLAS_INLINE
        dual_iterator_type end () const {
            iterator_type tmp (this->base ());
            return (-- tmp).end ();
        }
        BOOST_UBLAS_INLINE
        dual_reverse_iterator_type rbegin () const {
            return dual_reverse_iterator_type (end ());
        }
        BOOST_UBLAS_INLINE
        dual_reverse_iterator_type rend () const {
            return dual_reverse_iterator_type (begin ());
        }
    };

  /** \brief 2nd base class of all matrix reverse iterators. (non-MSVC version)
   *
   * \param I the derived iterator type
   *
   * The reverse iterator implements a bidirectional iterator
   * reversing the elements of the underlying iterator. It
   * implements most operators of a random access iterator.
   *
   * uBLAS extension: it.index1(), it.index2() and access to
   * the dual iterator via begin(), end(), rbegin(), rend()
   *
   * Note: this type is _identical_ to reverse_iterator_base1
   */

    // Renamed this class from reverse_iterator2 to get
    // typedef reverse_iterator2<...> reverse_iterator2
    // working. Thanks to Gabriel Dos Reis for explaining this.
    template <class I>
    class reverse_iterator_base2:
        public std::reverse_iterator<I> {
    public:
        typedef typename I::container_type container_type;
        typedef typename container_type::size_type size_type;
        typedef typename I::difference_type difference_type;
        typedef I iterator_type;
        typedef typename I::dual_iterator_type dual_iterator_type;
        typedef typename I::dual_reverse_iterator_type dual_reverse_iterator_type;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 ():
            std::reverse_iterator<iterator_type> () {}
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 (const iterator_type &it):
            std::reverse_iterator<iterator_type> (it) {}

        // Arithmetic
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 &operator ++ () {
            return *this = -- this->base ();
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 operator ++ (int) {
            reverse_iterator_base2 tmp (*this);
            *this = -- this->base ();
            return tmp;
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 &operator -- () {
            return *this = ++ this->base ();
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 operator -- (int) {
            reverse_iterator_base2 tmp (*this);
            *this = ++ this->base ();
            return tmp;
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 &operator += (difference_type n) {
            return *this = this->base () - n;
        }
        BOOST_UBLAS_INLINE
        reverse_iterator_base2 &operator -= (difference_type n) {
            return *this = this->base () + n;
        }

        BOOST_UBLAS_INLINE
        friend reverse_iterator_base2 operator + (const reverse_iterator_base2 &it, difference_type n) {
            reverse_iterator_base2 tmp (it);
            return tmp += n;
        }
        BOOST_UBLAS_INLINE
        friend reverse_iterator_base2 operator + (difference_type n, const reverse_iterator_base2 &it) {
            reverse_iterator_base2 tmp (it);
            return tmp += n;
        }
        BOOST_UBLAS_INLINE
        friend reverse_iterator_base2 operator - (const reverse_iterator_base2 &it, difference_type n) {
            reverse_iterator_base2 tmp (it);
            return tmp -= n;
        }
        BOOST_UBLAS_INLINE
        friend difference_type operator - (const reverse_iterator_base2 &it1, const reverse_iterator_base2 &it2) {
            return it2.base () - it1.base ();
        }

        BOOST_UBLAS_INLINE
        const container_type &operator () () const {
            return this->base () ();
        }

        BOOST_UBLAS_INLINE
        size_type index1 () const {
            iterator_type tmp (this->base ());
            return (-- tmp).index1 ();
        }
        BOOST_UBLAS_INLINE
        size_type index2 () const {
            iterator_type tmp (this->base ());
            return (-- tmp).index2 ();
        }

        BOOST_UBLAS_INLINE
        dual_iterator_type begin () const {
            iterator_type tmp (this->base ());
            return (-- tmp).begin ();
        }
        BOOST_UBLAS_INLINE
        dual_iterator_type end () const {
            iterator_type tmp (this->base ());
            return (-- tmp).end ();
        }
        BOOST_UBLAS_INLINE
        dual_reverse_iterator_type rbegin () const {
            return dual_reverse_iterator_type (end ());
        }
        BOOST_UBLAS_INLINE
        dual_reverse_iterator_type rend () const {
            return dual_reverse_iterator_type (begin ());
        }
    };

  /** \brief A class implementing an indexed random access iterator.
   *
   * \param C the (mutable) container type
   * \param IC the iterator category
   *
   * This class implements a random access iterator. The current 
   * position is stored as the unsigned integer it_ and the
   * values are accessed via operator()(it_) of the container.
   *
   * uBLAS extension: index()
   */

    template<class C, class IC>
    class indexed_iterator:
        public container_reference<C>,
        public random_access_iterator_base<IC,
                                           indexed_iterator<C, IC>,
                                           typename C::value_type,
                                           typename C::difference_type> {
    public:
        typedef C container_type;
        typedef IC iterator_category;
        typedef typename container_type::size_type size_type;
        typedef typename container_type::difference_type difference_type;
        typedef typename container_type::value_type value_type;
        typedef typename container_type::reference reference;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        indexed_iterator ():
            container_reference<container_type> (), it_ () {}
        BOOST_UBLAS_INLINE
        indexed_iterator (container_type &c, size_type it):
            container_reference<container_type> (c), it_ (it) {}

        // Arithmetic
        BOOST_UBLAS_INLINE
        indexed_iterator &operator ++ () {
            ++ it_;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_iterator &operator -- () {
            -- it_;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_iterator &operator += (difference_type n) {
            it_ += n;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_iterator &operator -= (difference_type n) {
            it_ -= n;
            return *this;
        }
        BOOST_UBLAS_INLINE
        difference_type operator - (const indexed_iterator &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            return it_ - it.it_;
        }

        // Dereference
        BOOST_UBLAS_INLINE
        reference operator * () const {
            BOOST_UBLAS_CHECK (index () < (*this) ().size (), bad_index ());
            return (*this) () (it_);
        }
        BOOST_UBLAS_INLINE
        reference operator [] (difference_type n) const {
            return *((*this) + n);
        }

        // Index
        BOOST_UBLAS_INLINE
        size_type index () const {
            return it_;
        }

        // Assignment
        BOOST_UBLAS_INLINE
        indexed_iterator &operator = (const indexed_iterator &it) {
            // FIX: ICC needs full qualification?!
            // assign (&it ());
            container_reference<C>::assign (&it ());
            it_ = it.it_;
            return *this;
        }

        // Comparison