vector_of_vector.hpp

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            if (itv == data ().end ())
                return;
            (*itv).erase_element (layout_type::index_m (i, j));
            storage_invariants ();
        }
        BOOST_UBLAS_INLINE
        void clear () {
            const size_type sizeM = layout_type::size_M (size1_, size2_);
            // FIXME should clear data () if this is done via value_type/*zero*/() then it is not size preserving
            for (size_type i = 0; i < sizeM; ++ i)
                ref (data () [i]).clear ();
            storage_invariants ();
        }

        // Iterator types
    private:
        // Use vector iterator
        typedef typename A::const_iterator const_vectoriterator_type;
        typedef typename A::iterator vectoriterator_type;
        typedef typename A::value_type::const_iterator const_subiterator_type;
        typedef typename A::value_type::iterator subiterator_type;

        BOOST_UBLAS_INLINE
        true_reference at_element (size_type i, size_type j) {
            return ref (ref (data () [layout_type::index_M (i, j)]) [layout_type::index_m (i, j)]);
        }

    public:
        class const_iterator1;
        class iterator1;
        class const_iterator2;
        class iterator2;
        typedef reverse_iterator_base1<const_iterator1> const_reverse_iterator1;
        typedef reverse_iterator_base1<iterator1> reverse_iterator1;
        typedef reverse_iterator_base2<const_iterator2> const_reverse_iterator2;
        typedef reverse_iterator_base2<iterator2> reverse_iterator2;

        // Element lookup
        // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.    
        const_iterator1 find1 (int rank, size_type i, size_type j, int direction = 1) const {
            for (;;) {
                const_vectoriterator_type itv (data ().find (layout_type::index_M (i, j)));
                const_vectoriterator_type itv_end (data ().end ());
                if (itv == itv_end)
                    return const_iterator1 (*this, rank, i, j, itv_end, (*(-- itv)).end ());

                const_subiterator_type it ((*itv).find (layout_type::index_m (i, j)));
                const_subiterator_type it_end ((*itv).end ());
                if (rank == 0)
                    return const_iterator1 (*this, rank, i, j, itv, it);
                if (it != it_end && it.index () == layout_type::index_m (i, j))
                    return const_iterator1 (*this, rank, i, j, itv, it);
                if (direction > 0) {
                    if (layout_type::fast_i ()) {
                        if (it == it_end)
                            return const_iterator1 (*this, rank, i, j, itv, it);
                        i = it.index ();
                    } else {
                        if (i >= size1_)
                            return const_iterator1 (*this, rank, i, j, itv, it);
                        ++ i;
                    }
                } else /* if (direction < 0)  */ {
                    if (layout_type::fast_i ()) {
                        if (it == (*itv).begin ())
                            return const_iterator1 (*this, rank, i, j, itv, it);
                        --it;
                        i = it.index ();
                    } else {
                        if (i == 0)
                            return const_iterator1 (*this, rank, i, j, itv, it);
                        -- i;
                    }
                }
            }
        }
        // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.    
        iterator1 find1 (int rank, size_type i, size_type j, int direction = 1) {
            for (;;) {
                vectoriterator_type itv (data ().find (layout_type::index_M (i, j)));
                vectoriterator_type itv_end (data ().end ());
                if (itv == itv_end)
                    return iterator1 (*this, rank, i, j, itv_end, (*(-- itv)).end ());

                subiterator_type it ((*itv).find (layout_type::index_m (i, j)));
                subiterator_type it_end ((*itv).end ());
                if (rank == 0)
                    return iterator1 (*this, rank, i, j, itv, it);
                if (it != it_end && it.index () == layout_type::index_m (i, j))
                    return iterator1 (*this, rank, i, j, itv, it);
                if (direction > 0) {
                    if (layout_type::fast_i ()) {
                        if (it == it_end)
                            return iterator1 (*this, rank, i, j, itv, it);
                        i = it.index ();
                    } else {
                        if (i >= size1_)
                            return iterator1 (*this, rank, i, j, itv, it);
                        ++ i;
                    }
                } else /* if (direction < 0)  */ {
                    if (layout_type::fast_i ()) {
                        if (it == (*itv).begin ())
                            return iterator1 (*this, rank, i, j, itv, it);
                        --it;
                        i = it.index ();
                    } else {
                        if (i == 0)
                            return iterator1 (*this, rank, i, j, itv, it);
                        -- i;
                    }
                }
            }
        }
        // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.    
        const_iterator2 find2 (int rank, size_type i, size_type j, int direction = 1) const {
            for (;;) {
                const_vectoriterator_type itv (data ().find (layout_type::index_M (i, j)));
                const_vectoriterator_type itv_end (data ().end ());
                if (itv == itv_end)
                    return const_iterator2 (*this, rank, i, j, itv_end, (*(-- itv)).end ());

                const_subiterator_type it ((*itv).find (layout_type::index_m (i, j)));
                const_subiterator_type it_end ((*itv).end ());
                if (rank == 0)
                    return const_iterator2 (*this, rank, i, j, itv, it);
                if (it != it_end && it.index () == layout_type::index_m (i, j))
                    return const_iterator2 (*this, rank, i, j, itv, it);
                if (direction > 0) {
                    if (layout_type::fast_j ()) {
                        if (it == it_end)
                            return const_iterator2 (*this, rank, i, j, itv, it);
                        j = it.index ();
                    } else {
                        if (j >= size2_)
                            return const_iterator2 (*this, rank, i, j, itv, it);
                        ++ j;
                    }
                } else /* if (direction < 0)  */ {
                    if (layout_type::fast_j ()) {
                        if (it == (*itv).begin ())
                            return const_iterator2 (*this, rank, i, j, itv, it);
                        --it;
                        j = it.index ();
                    } else {
                        if (j == 0)
                            return const_iterator2 (*this, rank, i, j, itv, it);
                        -- j;
                    }
                }
            }
        }
        // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.    
        iterator2 find2 (int rank, size_type i, size_type j, int direction = 1) {
            for (;;) {
                vectoriterator_type itv (data ().find (layout_type::index_M (i, j)));
                vectoriterator_type itv_end (data ().end ());
                if (itv == itv_end)
                    return iterator2 (*this, rank, i, j, itv_end, (*(-- itv)).end ());

                subiterator_type it ((*itv).find (layout_type::index_m (i, j)));
                subiterator_type it_end ((*itv).end ());
                if (rank == 0)
                    return iterator2 (*this, rank, i, j, itv, it);
                if (it != it_end && it.index () == layout_type::index_m (i, j))
                    return iterator2 (*this, rank, i, j, itv, it);
                if (direction > 0) {
                    if (layout_type::fast_j ()) {
                        if (it == it_end)
                            return iterator2 (*this, rank, i, j, itv, it);
                        j = it.index ();
                    } else {
                        if (j >= size2_)
                            return iterator2 (*this, rank, i, j, itv, it);
                        ++ j;
                    }
                } else /* if (direction < 0)  */ {
                    if (layout_type::fast_j ()) {
                        if (it == (*itv).begin ())
                            return iterator2 (*this, rank, i, j, itv, it);
                        --it;
                        j = it.index ();
                    } else {
                        if (j == 0)
                            return iterator2 (*this, rank, i, j, itv, it);
                        -- j;
                    }
                }
            }
        }


        class const_iterator1:
            public container_const_reference<generalized_vector_of_vector>,
            public bidirectional_iterator_base<sparse_bidirectional_iterator_tag,
                                               const_iterator1, value_type> {
        public:
            typedef typename generalized_vector_of_vector::difference_type difference_type;
            typedef typename generalized_vector_of_vector::value_type value_type;
            typedef typename generalized_vector_of_vector::const_reference reference;
            typedef const typename generalized_vector_of_vector::pointer pointer;

            typedef const_iterator2 dual_iterator_type;
            typedef const_reverse_iterator2 dual_reverse_iterator_type;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            const_iterator1 ():
                container_const_reference<self_type> (), rank_ (), i_ (), j_ (), itv_ (), it_ () {}
            BOOST_UBLAS_INLINE
            const_iterator1 (const self_type &m, int rank, size_type i, size_type j, const const_vectoriterator_type &itv, const const_subiterator_type &it):
                container_const_reference<self_type> (m), rank_ (rank), i_ (i), j_ (j), itv_ (itv), it_ (it) {}
            BOOST_UBLAS_INLINE
            const_iterator1 (const iterator1 &it):
                container_const_reference<self_type> (it ()), rank_ (it.rank_), i_ (it.i_), j_ (it.j_), itv_ (it.itv_), it_ (it.it_) {}

            // Arithmetic
            BOOST_UBLAS_INLINE
            const_iterator1 &operator ++ () {
                if (rank_ == 1 && layout_type::fast_i ())
                    ++ it_;
                else {
                    const self_type &m = (*this) ();
                    i_ = index1 () + 1;
                    if (rank_ == 1 && ++ itv_ == m.end1 ().itv_) 
                        *this = m.find1 (rank_, i_, j_, 1);
                    else if (rank_ == 1) {
                        it_ = (*itv_).begin ();
                        if (it_ == (*itv_).end () || index2 () != j_)
                            *this = m.find1 (rank_, i_, j_, 1);
                    }
                }
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator1 &operator -- () {
                if (rank_ == 1 && layout_type::fast_i ())
                    -- it_;
                else {
                    const self_type &m = (*this) ();
                    i_ = index1 () - 1;
                    if (rank_ == 1 && -- itv_ == m.end1 ().itv_)
                        *this = m.find1 (rank_, i_, j_, -1);
                    else if (rank_ == 1) {
                        it_ = (*itv_).begin ();
                        if (it_ == (*itv_).end () || index2 () != j_)
                            *this = m.find1 (rank_, i_, j_, -1);
                    } 
                }
                return *this;
            }

            // Dereference
            BOOST_UBLAS_INLINE
            const_reference operator * () const {
                BOOST_UBLAS_CHECK (index1 () < (*this) ().size1 (), bad_index ());
                BOOST_UBLAS_CHECK (index2 () < (*this) ().size2 (), bad_index ());
                if (rank_ == 1) {
                    return *it_;
                } else {
                    return (*this) () (i_, j_);
                }
            }

#ifndef BOOST_UBLAS_NO_NESTED_CLASS_RELATION
            BOOST_UBLAS_INLINE
#ifdef BOOST_UBLAS_MSVC_NESTED_CLASS_RELATION
            typename self_type::
#endif
            const_iterator2 begin () const {
                const self_type &m = (*this) ();
                return m.find2 (1, index1 (), 0);
            }
            BOOST_UBLAS_INLINE
#ifdef BOOST_UBLAS_MSVC_NESTED_CLASS_RELATION
            typename self_type::
#endif
            const_iterator2 end () const {
                const self_type &m = (*this) ();
                return m.find2 (1, index1 (), m.size2 ());
            }
            BOOST_UBLAS_INLINE
#ifdef BOOST_UBLAS_MSVC_NESTED_CLASS_RELATION
            typename self_type::
#endif
            const_reverse_iterator2 rbegin () const {
                return const_reverse_iterator2 (end ());
            }
            BOOST_UBLAS_INLINE
#ifdef BOOST_UBLAS_MSVC_NESTED_CLASS_RELATION
            typename self_type::
#endif
            const_reverse_iterator2 rend () const {
                return const_reverse_iterator2 (begin ());
            }
#endif

            // Indices
            BOOST_UBLAS_INLINE
            size_type index1 () const {
                BOOST_UBLAS_CHECK (*this != (*this) ().find1 (0, (*this) ().size1 (), j_), bad_index ());
                if (rank_ == 1) {
                    BOOST_UBLAS_CHECK (layout_type::index_M (itv_.index (), it_.index ()) < (*this) ().size1 (), bad_index ());
                    return layout_type::index_M (itv_.index (), it_.index ());
                } else {
                    return i_;
                }
            }
            BOOST_UBLAS_INLINE
            size_type index2 () const {
                BOOST_UBLAS_CHECK (*this != (*this) ().find1 (0, (*this) ().size1 (), j_), bad_index ());
                if (rank_ == 1) {
                    BOOST_UBLAS_CHECK (layout_type::index_m (itv_.index (), it_.index ()) < (*this) ().size2 (), bad_index ());
                    return layout_type::index_m (itv_.index (), it_.index ());
                } else {