matrix_proxy.hpp

C++的一个好库。。。现在很流行

        }

        // Accessors
        BOOST_UBLAS_INLINE
        size_type start1 () const {
            return s1_.start ();
        }
        BOOST_UBLAS_INLINE
        size_type start2 () const {
            return s2_.start ();
        }
        BOOST_UBLAS_INLINE
        difference_type stride1 () const {
            return s1_.stride ();
        }
        BOOST_UBLAS_INLINE
        difference_type stride2 () const {
            return s2_.stride ();
        }
        BOOST_UBLAS_INLINE
        size_type size () const {
            return BOOST_UBLAS_SAME (s1_.size (), s2_.size ());
        }

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

        // Element access
#ifndef BOOST_UBLAS_PROXY_CONST_MEMBER
        BOOST_UBLAS_INLINE
        const_reference operator () (size_type i) const {
            return data_ (s1_ (i), s2_ (i));
        }
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) {
            return data_ (s1_ (i), s2_ (i));
        }

        BOOST_UBLAS_INLINE
        const_reference operator [] (size_type i) const {
            return (*this) (i);
        }
        BOOST_UBLAS_INLINE
        reference operator [] (size_type i) {
            return (*this) (i);
        }
#else
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) const {
            return data_ (s1_ (i), s2_ (i));
        }

        BOOST_UBLAS_INLINE
        reference operator [] (size_type i) const {
            return (*this) (i);
        }
#endif

        // Assignment
        BOOST_UBLAS_INLINE
        matrix_vector_slice &operator = (const matrix_vector_slice &mvs) {
            // ISSUE need a temporary, proxy can be overlaping alias
            vector_assign<scalar_assign> (*this, typename vector_temporary_traits<M>::type (mvs));
            return *this;
        }
        BOOST_UBLAS_INLINE
        matrix_vector_slice &assign_temporary (matrix_vector_slice &mvs) {
            // assign elements, proxied container remains the same
            vector_assign<scalar_assign> (*this, mvs);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &operator = (const vector_expression<AE> &ae) {
            vector_assign<scalar_assign> (*this, typename vector_temporary_traits<M>::type (ae));
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_assign> (*this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &operator += (const vector_expression<AE> &ae) {
            vector_assign<scalar_assign> (*this, typename vector_temporary_traits<M>::type (*this + ae));
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &plus_assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_plus_assign> (*this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &operator -= (const vector_expression<AE> &ae) {
            vector_assign<scalar_assign> (*this, typename vector_temporary_traits<M>::type (*this - ae));
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &minus_assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_minus_assign> (*this, ae);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &operator *= (const AT &at) {
            vector_assign_scalar<scalar_multiplies_assign> (*this, at);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        matrix_vector_slice &operator /= (const AT &at) {
            vector_assign_scalar<scalar_divides_assign> (*this, at);
            return *this;
        }

        // Closure comparison
        BOOST_UBLAS_INLINE
        bool same_closure (const matrix_vector_slice &mvs) const {
            return (*this).data_.same_closure (mvs.data_);
        }

        // Comparison
        BOOST_UBLAS_INLINE
        bool operator == (const matrix_vector_slice &mvs) const {
            return (*this).data_ == mvs.data_ && s1_ == mvs.s1_ && s2_ == mvs.s2_;
        }

        // Swapping
        BOOST_UBLAS_INLINE
        void swap (matrix_vector_slice mvs) {
            if (this != &mvs) {
                BOOST_UBLAS_CHECK (size () == mvs.size (), bad_size ());
                // Sparse ranges may be nonconformant now.
                // std::swap_ranges (begin (), end (), mvs.begin ());
                vector_swap<scalar_swap> (*this, mvs);
            }
        }
        BOOST_UBLAS_INLINE
        friend void swap (matrix_vector_slice mvs1, matrix_vector_slice mvs2) {
            mvs1.swap (mvs2);
        }

        // Iterator types
    private:
        // Use slice as an index - FIXME this fails for packed assignment
        typedef typename slice_type::const_iterator const_subiterator1_type;
        typedef typename slice_type::const_iterator subiterator1_type;
        typedef typename slice_type::const_iterator const_subiterator2_type;
        typedef typename slice_type::const_iterator subiterator2_type;

    public:
        class const_iterator;
        class iterator;

        // Element lookup
        BOOST_UBLAS_INLINE
        const_iterator find (size_type i) const {
            return const_iterator (*this, s1_.begin () + i, s2_.begin () + i);
        }
        BOOST_UBLAS_INLINE
        iterator find (size_type i) {
            return iterator (*this, s1_.begin () + i, s2_.begin () + i);
        }

        // Iterators simply are indices.

        class const_iterator:
            public container_const_reference<matrix_vector_slice>,
            public iterator_base_traits<typename M::const_iterator1::iterator_category>::template
                        iterator_base<const_iterator, value_type>::type {
        public:
            // FIXME Iterator can never be different code was:
            // typename iterator_restrict_traits<typename M::const_iterator1::iterator_category, typename M::const_iterator2::iterator_category>::iterator_category>
            BOOST_STATIC_ASSERT ((boost::is_same<typename M::const_iterator1::iterator_category, typename M::const_iterator2::iterator_category>::value ));

            typedef typename matrix_vector_slice::value_type value_type;
            typedef typename matrix_vector_slice::difference_type difference_type;
            typedef typename matrix_vector_slice::const_reference reference;
            typedef const typename matrix_vector_slice::value_type *pointer;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            const_iterator ():
                container_const_reference<self_type> (), it1_ (), it2_ () {}
            BOOST_UBLAS_INLINE
            const_iterator (const self_type &mvs, const const_subiterator1_type &it1, const const_subiterator2_type &it2):
                container_const_reference<self_type> (mvs), it1_ (it1), it2_ (it2) {}
            BOOST_UBLAS_INLINE
            const_iterator (const iterator &it):
                container_const_reference<self_type> (it ()), it1_ (it.it1_), it2_ (it.it2_) {}

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

            // Dereference
            BOOST_UBLAS_INLINE
            const_reference operator * () const {
                // FIXME replace find with at_element
                return (*this) ().data_ (*it1_, *it2_);
            }

            // Index
            BOOST_UBLAS_INLINE
            size_type  index () const {
                return BOOST_UBLAS_SAME (it1_.index (), it2_.index ());
            }

            // Assignment
            BOOST_UBLAS_INLINE
            const_iterator &operator = (const const_iterator &it) {
                container_const_reference<self_type>::assign (&it ());
                it1_ = it.it1_;
                it2_ = it.it2_;
                return *this;
            }

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

        private:
            const_subiterator1_type it1_;
            const_subiterator2_type it2_;
        };

        BOOST_UBLAS_INLINE
        const_iterator begin () const {
            return find (0);
        }
        BOOST_UBLAS_INLINE
        const_iterator end () const {
            return find (size ());
        }

        class iterator:
            public container_reference<matrix_vector_slice>,
            public iterator_base_traits<typename M::iterator1::iterator_category>::template
                        iterator_base<iterator, value_type>::type {
        public:
            // FIXME Iterator can never be different code was:
            // typename iterator_restrict_traits<typename M::const_iterator1::iterator_category, typename M::const_iterator2::iterator_category>::iterator_category>
            BOOST_STATIC_ASSERT ((boost::is_same<typename M::const_iterator1::iterator_category, typename M::const_iterator2::iterator_category>::value ));

            typedef typename matrix_vector_slice::value_type value_type;
            typedef typename matrix_vector_slice::difference_type difference_type;
            typedef typename matrix_vector_slice::reference reference;
            typedef typename matrix_vector_slice::value_type *pointer;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            iterator ():
                container_reference<self_type> (), it1_ (), it2_ () {}
            BOOST_UBLAS_INLINE
            iterator (self_type &mvs, const subiterator1_type &it1, const subiterator2_type &it2):
                container_reference<self_type> (mvs), it1_ (it1), it2_ (it2) {}

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

            // Dereference
            BOOST_UBLAS_INLINE
            reference operator * () const {
                // FIXME replace find with at_element
                return (*this) ().data_ (*it1_, *it2_);
            }

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {