vector_proxy.hpp

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            vector_assign<scalar_assign> (*this, typename vector_temporary_traits<V>::type (ae));
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_indirect &assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_assign> (*this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_indirect &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_indirect &plus_assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_plus_assign> (*this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_indirect &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_indirect &minus_assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_minus_assign> (*this, ae);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        vector_indirect &operator *= (const AT &at) {
            vector_assign_scalar<scalar_multiplies_assign> (*this, at);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        vector_indirect &operator /= (const AT &at) {
            vector_assign_scalar<scalar_divides_assign> (*this, at);
            return *this;
        }

        // Closure comparison
        BOOST_UBLAS_INLINE
        bool same_closure (const vector_indirect &vr) const {
return true;
        }

        // Comparison
        BOOST_UBLAS_INLINE
        bool operator == (const vector_indirect &vi) const {
            return (*this).data_ == vi.data_ && ia_ == vi.ia_;
        }

        // Swapping
        BOOST_UBLAS_INLINE
        void swap (vector_indirect vi) {
            if (this != &vi) {
                BOOST_UBLAS_CHECK (size () == vi.size (), bad_size ());
                // Sparse ranges may be nonconformant now.
                // std::swap_ranges (begin (), end (), vi.begin ());
                vector_swap<scalar_swap> (*this, vi);
            }
        }
        BOOST_UBLAS_INLINE
        friend void swap (vector_indirect vi1, vector_indirect vi2) {
            vi1.swap (vi2);
        }

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

    public:
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
        typedef indexed_iterator<vector_indirect<vector_type, indirect_array_type>,
                                 typename vector_type::iterator::iterator_category> iterator;
        typedef indexed_const_iterator<vector_indirect<vector_type, indirect_array_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, ia_.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, ia_.begin () + i);
#endif
        }

        // Iterators simply are indices.

#ifndef BOOST_UBLAS_USE_INDEXED_ITERATOR
        class const_iterator:
            public container_const_reference<vector_indirect>,
            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 &vi, const const_subiterator_type &it):
                container_const_reference<self_type> (vi), 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
            const_iterator &operator ++ () {
                ++ it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator &operator -- () {
                -- it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator &operator += (difference_type n) {
                it_ += n;
                return *this;
            }
            BOOST_UBLAS_INLINE
            const_iterator &operator -= (difference_type n) {
                it_ -= n;
                return *this;
            }
            BOOST_UBLAS_INLINE
            difference_type operator - (const const_iterator &it) const {
                BOOST_UBLAS_CHECK ((*this) ().same_closure (it ()), external_logic ());
                return it_ - it.it_;
            }

            // Dereference
            BOOST_UBLAS_INLINE
            const_reference operator * () const {
                // FIXME replace find with at_element
                BOOST_UBLAS_CHECK (index () < (*this) ().size (), bad_index ());
                return (*this) ().data_ (*it_);
            }
            BOOST_UBLAS_INLINE
            const_reference operator [] (difference_type n) const {
                return *(*this + n);
            }

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                return it_.index ();
            }

            // 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_subiterator_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_indirect>,
            public iterator_base_traits<typename V::iterator::iterator_category>::template
                        iterator_base<iterator, value_type>::type {
        public:
            typedef typename V::iterator::difference_type difference_type;
            typedef typename V::iterator::value_type value_type;
            typedef typename V::reference reference;    //FIXME due to indexing access
            typedef typename V::iterator::pointer pointer;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            iterator ():
                container_reference<self_type> (), it_ () {}
            BOOST_UBLAS_INLINE
            iterator (self_type &vi, const subiterator_type &it):
                container_reference<self_type> (vi), 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 {
                // FIXME replace find with at_element
                BOOST_UBLAS_CHECK (index () < (*this) ().size (), bad_index ());
                return (*this) ().data_ (*it_);
            }
            BOOST_UBLAS_INLINE
            reference operator [] (difference_type n) const {
                return *(*this + n);
            }

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                return it_.index ();
            }

            // 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_;
        indirect_array_type ia_;
    };

    // Projections
    template<class V, class A>
    BOOST_UBLAS_INLINE
    vector_indirect<V, indirect_array<A> > project (V &data, const indirect_array<A> &ia) {
        return vector_indirect<V, indirect_array<A> > (data, ia);
    }
    template<class V, class A>
    BOOST_UBLAS_INLINE
    const vector_indirect<const V, indirect_array<A> > project (const V &data, const indirect_array<A> &ia) {
        // ISSUE was: return vector_indirect<V, indirect_array<A> > (const_cast<V &> (data), ia)
        return vector_indirect<const V, indirect_array<A> > (data, ia);
    }
    template<class V, class IA>
    BOOST_UBLAS_INLINE
    vector_indirect<V, IA> project (vector_indirect<V, IA> &data, const typename vector_indirect<V, IA>::range_type &r) {
        return data.project (r);
    }
    template<class V, class IA>
    BOOST_UBLAS_INLINE
    const vector_indirect<V, IA> project (const vector_indirect<V, IA> &data, const typename vector_indirect<V, IA>::range_type &r) {
        return data.project (r);
    }
    template<class V, class IA>
    BOOST_UBLAS_INLINE
    vector_indirect<V, IA> project (vector_indirect<V, IA> &data, const typename vector_indirect<V, IA>::slice_type &s) {
        return data.project (s);
    }
    template<class V, class IA>
    BOOST_UBLAS_INLINE
    const vector_indirect<V, IA> project (const vector_indirect<V, IA> &data, const typename vector_indirect<V, IA>::slice_type &s) {
        return data.project (s);
    }
    template<class V, class A>
    BOOST_UBLAS_INLINE
    vector_indirect<V, indirect_array<A> > project (vector_indirect<V, indirect_array<A> > &data, const indirect_array<A> &ia) {
        return data.project (ia);
    }
    template<class V, class A>
    BOOST_UBLAS_INLINE
    const vector_indirect<V, indirect_array<A> > project (const vector_indirect<V, indirect_array<A> > &data, const indirect_array<A> &ia) {
        return data.project (ia);
    }

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

}}}

#endif