matrix.hpp

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            size1_ (0), size2_ (0), data_ (1) {}
        BOOST_UBLAS_INLINE
        vector_of_vector (size_type size1, size_type size2):
            matrix_container<self_type> (),
            size1_ (size1), size2_ (size2), data_ (1) {
            resize (size1, size2, true);
        }
        BOOST_UBLAS_INLINE
        vector_of_vector (const vector_of_vector &m):
            matrix_container<self_type> (),
            size1_ (m.size1_), size2_ (m.size2_), data_ (m.data_) {}
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector (const matrix_expression<AE> &ae):
            matrix_container<self_type> (),
            size1_ (ae ().size1 ()), size2_ (ae ().size2 ()), data_ (layout_type::size_M (size1_, size2_) + 1) {
            for (size_type k = 0; k < layout_type::size_M (size1_, size2_); ++ k)
                data ()[k].resize (layout_type::size_m (size1_, size2_));
            matrix_assign<scalar_assign> (*this, ae);
        }

        // Accessors
        BOOST_UBLAS_INLINE
        size_type size1 () const {
            return size1_;
        }
        BOOST_UBLAS_INLINE
        size_type size2 () const { 
            return size2_;
        }

        // Storage accessors
        BOOST_UBLAS_INLINE
        const array_type &data () const {
            return data_;
        }
        BOOST_UBLAS_INLINE
        array_type &data () {
            return data_;
        }

        // Resizing
        BOOST_UBLAS_INLINE
        void resize (size_type size1, size_type size2, bool preserve = true) {
            size1_ = size1;
            size2_ = size2;
            if (preserve)
                data ().resize (layout_type::size_M (size1, size2) + 1, typename array_type::value_type ());
            else
                data ().resize (layout_type::size_M (size1, size2) + 1);
            for (size_type k = 0; k < layout_type::size_M (size1, size2); ++ k) {
                if (preserve)
                    data () [k].resize (layout_type::size_m (size1, size2), value_type ());
                else
                    data () [k].resize (layout_type::size_m (size1, size2));
            }
        }

        // Element access
        BOOST_UBLAS_INLINE
        const_reference operator () (size_type i, size_type j) const {
            return data () [layout_type::index_M (i, j)] [layout_type::index_m (i, j)];
        }
        BOOST_UBLAS_INLINE
        reference at_element (size_type i, size_type j) {
            return data () [layout_type::index_M (i, j)] [layout_type::index_m (i, j)];
        }
        BOOST_UBLAS_INLINE
        reference operator () (size_type i, size_type j) {
            return at_element (i, j); 
        }

        // Element assignment
        BOOST_UBLAS_INLINE
        reference insert_element (size_type i, size_type j, const_reference t) {
            return (at_element (i, j) = t); 
        }
        BOOST_UBLAS_INLINE
        void erase_element (size_type i, size_type j) {
            at_element (i, j) = value_type/*zero*/(); 
        }
        
        // Zeroing
        BOOST_UBLAS_INLINE
        void clear () {
            for (size_type k = 0; k < layout_type::size_M (size1_, size2_); ++ k)
                std::fill (data () [k].begin (), data () [k].end (), value_type/*zero*/());
        }

        // Assignment
        BOOST_UBLAS_INLINE
        vector_of_vector &operator = (const vector_of_vector &m) {
            size1_ = m.size1_;
            size2_ = m.size2_;
            data () = m.data ();
            return *this;
        }
        BOOST_UBLAS_INLINE
        vector_of_vector &assign_temporary (vector_of_vector &m) { 
            swap (m);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector &operator = (const matrix_expression<AE> &ae) { 
            self_type temporary (ae);
            return assign_temporary (temporary);
        }
        template<class C>          // Container assignment without temporary
        BOOST_UBLAS_INLINE
        vector_of_vector &operator = (const matrix_container<C> &m) {
            resize (m ().size1 (), m ().size2 (), false);
            assign (m);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector &assign (const matrix_expression<AE> &ae) { 
            matrix_assign<scalar_assign> (*this, ae); 
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector& operator += (const matrix_expression<AE> &ae) {
            self_type temporary (*this + ae);
            return assign_temporary (temporary);
        }
        template<class C>          // Container assignment without temporary
        BOOST_UBLAS_INLINE
        vector_of_vector &operator += (const matrix_container<C> &m) {
            plus_assign (m);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector &plus_assign (const matrix_expression<AE> &ae) { 
            matrix_assign<scalar_plus_assign> (*this, ae); 
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector& operator -= (const matrix_expression<AE> &ae) {
            self_type temporary (*this - ae);
            return assign_temporary (temporary);
        }
        template<class C>          // Container assignment without temporary
        BOOST_UBLAS_INLINE
        vector_of_vector &operator -= (const matrix_container<C> &m) {
            minus_assign (m);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_of_vector &minus_assign (const matrix_expression<AE> &ae) {
            matrix_assign<scalar_minus_assign> (*this, ae); 
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        vector_of_vector& operator *= (const AT &at) {
            matrix_assign_scalar<scalar_multiplies_assign> (*this, at);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        vector_of_vector& operator /= (const AT &at) {
            matrix_assign_scalar<scalar_divides_assign> (*this, at);
            return *this;
        }

        // Swapping
        BOOST_UBLAS_INLINE
        void swap (vector_of_vector &m) {
            if (this != &m) {
                std::swap (size1_, m.size1_);
                std::swap (size2_, m.size2_);
                data ().swap (m.data ());
            }
        }
        BOOST_UBLAS_INLINE
        friend void swap (vector_of_vector &m1, vector_of_vector &m2) {
            m1.swap (m2);
        }

        // Iterator types
    private:
        // Use the vector iterator
        typedef typename A::value_type::const_iterator const_subiterator_type;
        typedef typename A::value_type::iterator subiterator_type;
    public:
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
        typedef indexed_iterator1<self_type, dense_random_access_iterator_tag> iterator1;
        typedef indexed_iterator2<self_type, dense_random_access_iterator_tag> iterator2;
        typedef indexed_const_iterator1<self_type, dense_random_access_iterator_tag> const_iterator1;
        typedef indexed_const_iterator2<self_type, dense_random_access_iterator_tag> const_iterator2;
#else
        class const_iterator1;
        class iterator1;
        class const_iterator2;
        class iterator2;
#endif
        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
        const_iterator1 find1 (int /*rank*/, size_type i, size_type j) const {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            return const_iterator1 (*this, i, j);
#else
            return const_iterator1 (*this, i, j, data () [layout_type::index_M (i, j)].begin ()  + layout_type::index_m (i, j));
#endif
        }
        BOOST_UBLAS_INLINE
        iterator1 find1 (int /*rank*/, size_type i, size_type j) {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            return iterator1 (*this, i, j);
#else
            return iterator1 (*this, i, j, data () [layout_type::index_M (i, j)].begin ()  + layout_type::index_m (i, j));
#endif
        }
        BOOST_UBLAS_INLINE
        const_iterator2 find2 (int /*rank*/, size_type i, size_type j) const {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            return const_iterator2 (*this, i, j);
#else
            return const_iterator2 (*this, i, j, data () [layout_type::index_M (i, j)].begin ()  + layout_type::index_m (i, j));
#endif
        }
        BOOST_UBLAS_INLINE
        iterator2 find2 (int /*rank*/, size_type i, size_type j) {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            return iterator2 (*this, i, j);
#else
            return iterator2 (*this, i, j, data () [layout_type::index_M (i, j)].begin () + layout_type::index_m (i, j));
#endif
        }


#ifndef BOOST_UBLAS_USE_INDEXED_ITERATOR
        class const_iterator1:
            public container_const_reference<vector_of_vector>,
            public random_access_iterator_base<dense_random_access_iterator_tag,
                                               const_iterator1, value_type> {
        public:
            typedef typename vector_of_vector::value_type value_type;
            typedef typename vector_of_vector::difference_type difference_type;
            typedef typename vector_of_vector::const_reference reference;
            typedef const typename 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> (), i_ (), j_ (), it_ () {}
            BOOST_UBLAS_INLINE
            const_iterator1 (const self_type &m, size_type i, size_type j, const const_subiterator_type &it):
                container_const_reference<self_type> (m), i_ (i), j_ (j), it_ (it) {}
            BOOST_UBLAS_INLINE
            const_iterator1 (const iterator1 &it):
                container_const_reference<self_type> (it ()), i_ (it.i_), j_ (it.j_), it_ (it.it_) {}

            // Arithmetic
            BOOST_UBLAS_INLINE
            const_iterator1 &operator ++ () {
                ++ i_;
                const self_type &m = (*this) ();
                if (layout_type::fast_i ())
                    ++ it_;
                else 
                    it_ = m.find1 (1, i_, j_).it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator1 &operator -- () {
                -- i_;
                const self_type &m = (*this) ();
                if (layout_type::fast_i ())
                    -- it_;
                else
                    it_ = m.find1 (1, i_, j_).it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator1 &operator += (difference_type n) {
                i_ += n;
                const self_type &m = (*this) ();
                it_ = m.find1 (1, i_, j_).it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator1 &operator -= (difference_type n) {
                i_ -= n;
                const self_type &m = (*this) ();
                it_ = m.find1 (1, i_, j_).it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            difference_type operator - (const const_iterator1 &it) const {
                BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
                BOOST_UBLAS_CHECK (index2 () == it.index2 (), bad_index ());
                return index1 () - it.index1 ();
            }

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

#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