vector_proxy.hpp

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                return *it_;
            }

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                return it_.index () - (*this) ().start ();
            }

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

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

        private:
            const_iterator_type it_;
        };
#endif

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

#ifndef BOOST_UBLAS_USE_INDEXED_ITERATOR
        class iterator:
            public container_reference<vector_range>,
#ifndef BOOST_UBLAS_NO_ITERATOR_BASE_TRAITS
            public iterator_base_traits<typename iterator_type::iterator_category>::template
                        iterator_base<iterator, value_type>::type {
#else
            public random_access_iterator_base<typename V::iterator::iterator_category,
                                               iterator, value_type> {
#endif
        public:
            typedef typename iterator_type::iterator_category iterator_category;
            typedef typename iterator_type::difference_type difference_type;
            typedef typename iterator_type::value_type value_type;
            typedef typename iterator_type::reference reference;
            typedef typename iterator_type::pointer pointer;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            iterator ():
                container_reference<self_type> (), it_ () {}
            BOOST_UBLAS_INLINE
            iterator (self_type &vr, const iterator_type &it):
                container_reference<self_type> (vr), it_ (it) {}

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

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

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                return it_.index () - (*this) ().start ();
            }

            // Assignment
            BOOST_UBLAS_INLINE
            iterator &operator = (const iterator &it) {
                container_reference<self_type>::assign (&it ());
                it_ = it.it_;
                return *this;
            }

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

        private:
            iterator_type it_;

            friend class const_iterator;
        };
#endif

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

        // Reverse iterator

#ifdef BOOST_MSVC_STD_ITERATOR
        typedef reverse_iterator_base<const_iterator, value_type, const_reference> const_reverse_iterator;
#else
        typedef reverse_iterator_base<const_iterator> const_reverse_iterator;
#endif

        BOOST_UBLAS_INLINE
        const_reverse_iterator rbegin () const {
            return const_reverse_iterator (end ());
        }
        BOOST_UBLAS_INLINE
        const_reverse_iterator rend () const {
            return const_reverse_iterator (begin ());
        }

#ifdef BOOST_MSVC_STD_ITERATOR
        typedef reverse_iterator_base<iterator, value_type, reference> reverse_iterator;
#else
        typedef reverse_iterator_base<iterator> reverse_iterator;
#endif

        BOOST_UBLAS_INLINE
        reverse_iterator rbegin () {
            return reverse_iterator (end ());
        }
        BOOST_UBLAS_INLINE
        reverse_iterator rend () {
            return reverse_iterator (begin ());
        }

    private:
        vector_closure_type data_;
        range_type r_;
        static vector_type nil_;
    };

    template<class V>
    typename vector_range<V>::vector_type vector_range<V>::nil_
#ifdef BOOST_UBLAS_STATIC_OLD_INIT
        = BOOST_UBLAS_TYPENAME vector_range<V>::vector_type ()
#endif
    ;

    // Projections
    template<class V>
    BOOST_UBLAS_INLINE
    vector_range<V> project (V &data, const typename vector_range<V>::range_type &r) {
        return vector_range<V> (data, r);
    }
#ifdef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
    template<class V>
    BOOST_UBLAS_INLINE
    const vector_range<const V> project_const (const V &data, const typename vector_range<V>::range_type &r) {
        return vector_range<const V> (data, r);
    }
#else
    template<class V>
    BOOST_UBLAS_INLINE
    const vector_range<const V> project (const V &data, const typename vector_range<V>::range_type &r) {
        // ISSUE was: return vector_range<V> (const_cast<V &> (data), r);
        return vector_range<const V> (data, r);
    }
    template<class V>
    BOOST_UBLAS_INLINE
    vector_range<V> project (vector_range<V> &data, const typename vector_range<V>::range_type &r) {
        return data.project (r);
    }
    template<class V>
    BOOST_UBLAS_INLINE
    const vector_range<V> project (const vector_range<V> &data, const typename vector_range<V>::range_type &r) {
        return data.project (r);
    }
#endif

    // Vector based slice class
    template<class V>
    class vector_slice:
        public vector_expression<vector_slice<V> > {
    public:
#ifndef BOOST_UBLAS_NO_PROXY_SHORTCUTS
        BOOST_UBLAS_USING vector_expression<vector_slice<V> >::operator ();
#endif
        typedef const V const_vector_type;
        typedef V vector_type;
        typedef typename V::simd_category simd_category;
        typedef typename V::size_type size_type;
        typedef typename V::difference_type difference_type;
        typedef typename V::value_type value_type;
#ifndef BOOST_UBLAS_CT_PROXY_BASE_TYPEDEFS
        typedef typename V::const_reference const_reference;
        typedef typename V::reference reference;
#else
        typedef typename V::const_reference const_reference;
        typedef typename boost::mpl::if_<boost::is_const<V>,
                                          typename V::const_reference,
                                          typename V::reference>::type reference;
#endif
#ifndef BOOST_UBLAS_CT_PROXY_CLOSURE_TYPEDEFS
        typedef typename V::closure_type vector_closure_type;
#else
        typedef typename boost::mpl::if_<boost::is_const<V>,
                                          typename V::const_closure_type,
                                          typename V::closure_type>::type vector_closure_type;
#endif
    private:
        typedef vector_slice<vector_type> self_type;
    public:
        typedef basic_range<size_type, difference_type> range_type;
        typedef basic_slice<size_type, difference_type> slice_type;
        typedef const self_type const_closure_type;
        typedef self_type closure_type;
        typedef typename V::vector_temporary_type vector_temporary_type;
        typedef typename storage_restrict_traits<typename V::storage_category,
                                                 dense_proxy_tag>::storage_category storage_category;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        vector_slice ():
            data_ (nil_), s_ () {}
        BOOST_UBLAS_INLINE
        vector_slice (vector_type &data, const slice_type &s):
            data_ (data), s_ (s.preprocess (data.size ())) {
            // Early checking of preconditions here.
            // BOOST_UBLAS_CHECK (s_.start () <= data_.size () &&
            //                    s_.start () + s_.stride () * (s_.size () - (s_.size () > 0)) <= data_.size (), bad_index ());
        }
        BOOST_UBLAS_INLINE
        vector_slice (const vector_closure_type &data, const slice_type &s, int):
            data_ (data), s_ (s.preprocess (data.size ())) {
            // Early checking of preconditions here.
            // BOOST_UBLAS_CHECK (s_.start () <= data_.size () &&
            //                    s_.start () + s_.stride () * (s_.size () - (s_.size () > 0)) <= data_.size (), bad_index ());
        }

        // Accessors
        BOOST_UBLAS_INLINE
        size_type start () const {
            return s_.start ();
        }
        BOOST_UBLAS_INLINE
        difference_type stride () const {
            return s_.stride ();
        }
        BOOST_UBLAS_INLINE
        size_type size () const {
            return s_.size ();
        }
        BOOST_UBLAS_INLINE
        const vector_closure_type &data () const {
            return data_;
        }
        BOOST_UBLAS_INLINE
        vector_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_ (s_ (i));
        }
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) {
            return data_ (s_ (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_ (s_ (i));
        }

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

        // ISSUE can this be done in free project function?
        // Although a const function can create a non-const proxy to a non-const object
        // Critical is that vector_type and data_ (vector_closure_type) are const correct
        BOOST_UBLAS_INLINE
        vector_slice<vector_type> project (const range_type &r) const {
            return vector_slice<vector_type>  (data_, s_.compose (r.preprocess (data_.size ())), false);
        }
        BOOST_UBLAS_INLINE
        vector_slice<vector_type> project (const slice_type &s) const {
            return vector_slice<vector_type>  (data_, s_.compose (s.preprocess (data_.size ())), false);
        }