vector_proxy.hpp

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

            // 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:
            subiterator_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
        typedef reverse_iterator_base<const_iterator> const_reverse_iterator;
        typedef reverse_iterator_base<iterator> reverse_iterator;

        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 ());
        }
        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_;
    };

    // Simple Projections
    template<class V>
    BOOST_UBLAS_INLINE
    vector_range<V> subrange (V &data, typename V::size_type start, typename V::size_type stop) {
        typedef basic_range<typename V::size_type, typename V::difference_type> range_type;
        return vector_range<V> (data, range_type (start, stop));
    }
    template<class V>
    BOOST_UBLAS_INLINE
    vector_range<const V> subrange (const V &data, typename V::size_type start, typename V::size_type stop) {
        typedef basic_range<typename V::size_type, typename V::difference_type> range_type;
        return vector_range<const V> (data, range_type (start, stop));
    }

    // Generic Projections
    template<class V>
    BOOST_UBLAS_INLINE
    vector_range<V> project (V &data, typename vector_range<V>::range_type const &r) {
        return vector_range<V> (data, r);
    }
    template<class V>
    BOOST_UBLAS_INLINE
    const vector_range<const V> project (const V &data, typename vector_range<V>::range_type const &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);
    }

    // Specialization of temporary_traits
    template <class V>
    struct vector_temporary_traits< vector_range<V> >
    : vector_temporary_traits< V > {} ;
    template <class V>
    struct vector_temporary_traits< const vector_range<V> >
    : vector_temporary_traits< V > {} ;


    // Vector based slice class
    template<class V>
    class vector_slice:
        public vector_expression<vector_slice<V> > {

        typedef vector_slice<V> self_type;
    public:
#ifdef BOOST_UBLAS_ENABLE_PROXY_SHORTCUTS
        using vector_expression<self_type>::operator ();
#endif
        typedef const V const_vector_type;
        typedef V vector_type;
        typedef typename V::size_type size_type;
        typedef typename V::difference_type difference_type;
        typedef typename V::value_type value_type;
        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;
        typedef typename boost::mpl::if_<boost::is_const<V>,
                                          typename V::const_closure_type,
                                          typename V::closure_type>::type vector_closure_type;
        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 storage_restrict_traits<typename V::storage_category,
                                                 dense_proxy_tag>::storage_category storage_category;

        // Construction and destruction
        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 ();
        }

        // Storage accessors
        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);
        }

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

        // Comparison
        BOOST_UBLAS_INLINE
        bool operator == (const vector_slice &vs) const {
            return (*this).data_ == vs.data_ && s_ == vs.s_;
        }

        // Swapping
        BOOST_UBLAS_INLINE
        void swap (vector_slice vs) {
            if (this != &vs) {
                BOOST_UBLAS_CHECK (size () == vs.size (), bad_size ());
                // Sparse ranges may be nonconformant now.
                // std::swap_ranges (begin (), end (), vs.begin ());
                vector_swap<scalar_swap> (*this, vs);
            }
        }
        BOOST_UBLAS_INLINE
        friend void swap (vector_slice vs1, vector_slice vs2) {
            vs1.swap (vs2);
        }

        // Iterator types
    private:
        // Use slice as an index - FIXME this fails for packed assignment
        typedef typename slice_type::const_iterator const_subiterator_type;
        typedef typename slice_type::const_iterator subiterator_type;

    public:
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
        typedef indexed_iterator<vector_slice<vector_type>,
                                 typename vector_type::iterator::iterator_category> iterator;
        typedef indexed_const_iterator<vector_slice<vector_type>,
                                       typename vector_type::const_iterator::iterator_category> const_iterator;
#else
        class const_iterator;
        class iterator;
#endif

        // Element lookup
        BOOST_UBLAS_INLINE
        const_iterator find (size_type i) const {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            return const_iterator (*this, i);
#else
            return const_iterator (*this, s_.begin () + i);
#endif
        }
        BOOST_UBLAS_INLINE
        iterator find (size_type i) {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            return iterator (*this, i);
#else
            return iterator (*this, s_.begin () + i);
#endif
        }

#ifndef BOOST_UBLAS_USE_INDEXED_ITERATOR
        class const_iterator:
            public container_const_reference<vector_slice>,
            public iterator_base_traits<typename V::const_iterator::iterator_category>::template
                        iterator_base<const_iterator, value_type>::type {
        public:
            typedef typename V::const_iterator::difference_type difference_type;
            typedef typename V::const_iterator::value_type value_type;
            typedef typename V::const_reference reference;    //FIXME due to indexing access
            typedef typename V::const_iterator::pointer pointer;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            const_iterator ():
                container_const_reference<self_type> (), it_ () {}
            BOOST_UBLAS_INLINE
            const_iterator (const self_type &vs, const const_subiterator_type &it):
                container_const_reference<self_type> (vs), it_ (it) {}
            BOOST_UBLAS_INLINE
            const_iterator (const typename self_type::iterator &it):  // ISSUE self_type:: stops VC8 using std::iterator here
                container_const_reference<self_type> (it ()), it_ (it.it_) {}

            // Arithmetic
            BOOST_UBLAS_INLINE