iterator.hpp

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        }
        BOOST_UBLAS_INLINE
        reference operator [] (difference_type n) const {
            return *((*this) + n);
        }

        // Index
        BOOST_UBLAS_INLINE
        size_type index1 () const {
            return it1_;
        }
        BOOST_UBLAS_INLINE
        size_type index2 () const {
            return it2_;
        }

        BOOST_UBLAS_INLINE
        dual_iterator_type begin () const {
            return (*this) ().find2 (1, index1 (), 0); 
        }
        BOOST_UBLAS_INLINE
        dual_iterator_type end () const {
            return (*this) ().find2 (1, index1 (), (*this) ().size2 ()); 
        }
        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 ()); 
        }

        // Assignment
        BOOST_UBLAS_INLINE
        indexed_const_iterator1 &operator = (const indexed_const_iterator1 &it) {
            // FIX: ICC needs full qualification?!
            // assign (&it ());
            container_const_reference<C>::assign (&it ());
            it1_ = it.it1_;
            it2_ = it.it2_;
            return *this;
        }

        // Comparison
        BOOST_UBLAS_INLINE
        bool operator == (const indexed_const_iterator1 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it2_ == it.it2_, external_logic ());
            return it1_ == it.it1_;
        }
        BOOST_UBLAS_INLINE
        bool operator < (const indexed_const_iterator1 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it2_ == it.it2_, external_logic ());
            return it1_ < it.it1_;
        }

    private:
        size_type it1_;
        size_type it2_;

        friend class indexed_iterator1<container_type, iterator_category>;
    };

  /** \brief A class implementing an indexed random access iterator 
   * of a matrix.
   *
   * \param C the (mutable) container type
   * \param IC the iterator category
   *
   * This class implements a random access iterator. The current
   * position is stored as two unsigned integers \c it1_ and \c it2_
   * and the values are accessed via \c operator()(it1_, it2_) of the
   * container. The iterator changes the second index.
   *
   * uBLAS extension: \c index1(), \c index2() and access to the
   * dual iterator via \c begin(), \c end(), \c rbegin() and \c rend()
   *
   * Note: The container has to support the find1(rank, i, j) method
   */
    template<class C, class IC>
    class indexed_iterator2:
        public container_reference<C>, 
        public random_access_iterator_base<IC,
                                           indexed_iterator2<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;

        typedef indexed_iterator1<container_type, iterator_category> dual_iterator_type;
        typedef reverse_iterator_base1<dual_iterator_type> dual_reverse_iterator_type;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        indexed_iterator2 ():
            container_reference<container_type> (), it1_ (), it2_ () {}
        BOOST_UBLAS_INLINE
        indexed_iterator2 (container_type &c, size_type it1, size_type it2):
            container_reference<container_type> (c), it1_ (it1), it2_ (it2) {}

        // Arithmetic
        BOOST_UBLAS_INLINE
        indexed_iterator2 &operator ++ () {
            ++ it2_;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_iterator2 &operator -- () {
            -- it2_;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_iterator2 &operator += (difference_type n) {
            it2_ += n;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_iterator2 &operator -= (difference_type n) {
            it2_ -= n;
            return *this;
        }
        BOOST_UBLAS_INLINE
        difference_type operator - (const indexed_iterator2 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it1_ == it.it1_, external_logic ());
            return it2_ - it.it2_;
        }

        // Dereference
        BOOST_UBLAS_INLINE
        reference operator * () const {
            BOOST_UBLAS_CHECK (index1 () < (*this) ().size1 (), bad_index ());
            BOOST_UBLAS_CHECK (index2 () < (*this) ().size2 (), bad_index ());
            return (*this) () (it1_, it2_);
        }
        BOOST_UBLAS_INLINE
        reference operator [] (difference_type n) const {
            return *((*this) + n);
        }

        // Index
        BOOST_UBLAS_INLINE
        size_type index1 () const {
            return it1_;
        }
        BOOST_UBLAS_INLINE
        size_type index2 () const {
            return it2_;
        }

        BOOST_UBLAS_INLINE
        dual_iterator_type begin () const {
            return (*this) ().find1 (1, 0, index2 ());
        }
        BOOST_UBLAS_INLINE
        dual_iterator_type end () const {
            return (*this) ().find1 (1, (*this) ().size1 (), index2 ());
        }
        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 ());
        }

        // Assignment
        BOOST_UBLAS_INLINE
        indexed_iterator2 &operator = (const indexed_iterator2 &it) {
            // FIX: ICC needs full qualification?!
            // assign (&it ());
            container_reference<C>::assign (&it ());
            it1_ = it.it1_;
            it2_ = it.it2_;
            return *this;
        }

        // Comparison
        BOOST_UBLAS_INLINE
        bool operator == (const indexed_iterator2 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it1_ == it.it1_, external_logic ());
            return it2_ == it.it2_;
        }
        BOOST_UBLAS_INLINE
        bool operator < (const indexed_iterator2 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it1_ == it.it1_, external_logic ());
            return it2_ < it.it2_;
        }

    private:
        size_type it1_;
        size_type it2_;
    };

  /** \brief A class implementing an indexed random access iterator 
   * of a matrix.
   *
   * \param C the (immutable) container type
   * \param IC the iterator category
   *
   * This class implements a random access iterator. The current
   * position is stored as two unsigned integers \c it1_ and \c it2_
   * and the values are accessed via \c operator()(it1_, it2_) of the
   * container. The iterator changes the second index.
   *
   * uBLAS extension: \c index1(), \c index2() and access to the
   * dual iterator via \c begin(), \c end(), \c rbegin() and \c rend()
   *
   * Note 1: The container has to support the \c find2(rank, i, j) method
   *
   * Note 2: there is an automatic conversion from 
   * \c indexed_iterator2 to \c indexed_const_iterator2
   */

    template<class C, class IC>
    class indexed_const_iterator2:
        public container_const_reference<C>,
        public random_access_iterator_base<IC,
                                           indexed_const_iterator2<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::const_reference reference;

        typedef indexed_iterator2<container_type, iterator_category> iterator_type;
        typedef indexed_const_iterator1<container_type, iterator_category> dual_iterator_type;
        typedef reverse_iterator_base1<dual_iterator_type> dual_reverse_iterator_type;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 ():
            container_const_reference<container_type> (), it1_ (), it2_ () {}
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 (const container_type &c, size_type it1, size_type it2):
            container_const_reference<container_type> (c), it1_ (it1), it2_ (it2) {}
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 (const iterator_type &it):
            container_const_reference<container_type> (it ()), it1_ (it.index1 ()), it2_ (it.index2 ()) {}

        // Arithmetic
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 &operator ++ () {
            ++ it2_;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 &operator -- () {
            -- it2_;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 &operator += (difference_type n) {
            it2_ += n;
            return *this;
        }
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 &operator -= (difference_type n) {
            it2_ -= n;
            return *this;
        }
        BOOST_UBLAS_INLINE
        difference_type operator - (const indexed_const_iterator2 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it1_ == it.it1_, external_logic ());
            return it2_ - it.it2_;
        }

        // Dereference
        BOOST_UBLAS_INLINE
        reference operator * () const {
            BOOST_UBLAS_CHECK (index1 () < (*this) ().size1 (), bad_index ());
            BOOST_UBLAS_CHECK (index2 () < (*this) ().size2 (), bad_index ());
            return (*this) () (it1_, it2_);
        }
        BOOST_UBLAS_INLINE
        reference operator [] (difference_type n) const {
            return *((*this) + n);
        }

        // Index
        BOOST_UBLAS_INLINE
        size_type index1 () const {
            return it1_;
        }
        BOOST_UBLAS_INLINE
        size_type index2 () const {
            return it2_;
        }

        BOOST_UBLAS_INLINE
        dual_iterator_type begin () const {
            return (*this) ().find1 (1, 0, index2 ());
        }
        BOOST_UBLAS_INLINE
        dual_iterator_type end () const {
            return (*this) ().find1 (1, (*this) ().size1 (), index2 ());
        }
        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 ());
        }

        // Assignment
        BOOST_UBLAS_INLINE
        indexed_const_iterator2 &operator = (const indexed_const_iterator2 &it) {
            // FIX: ICC needs full qualification?!
            // assign (&it ());
            container_const_reference<C>::assign (&it ());
            it1_ = it.it1_;
            it2_ = it.it2_;
            return *this;
        }

        // Comparison
        BOOST_UBLAS_INLINE
        bool operator == (const indexed_const_iterator2 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it1_ == it.it1_, external_logic ());
            return it2_ == it.it2_;
        }
        BOOST_UBLAS_INLINE
        bool operator < (const indexed_const_iterator2 &it) const {
            BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
            BOOST_UBLAS_CHECK (it1_ == it.it1_, external_logic ());
            return it2_ < it.it2_;
        }

    private:
        size_type it1_;
        size_type it2_;

        friend class indexed_iterator2<container_type, iterator_category>;
    };

}}}

#endif