vector_expression.hpp

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        BOOST_UBLAS_INLINE
        reference operator [] (size_type i) {
            return expression () [i];
        }
#else
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) const {
            return expression () (i);
        }

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

        // Assignment
        BOOST_UBLAS_INLINE
        vector_reference &operator = (const vector_reference &v) {
            expression ().operator = (v);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_reference &operator = (const vector_expression<AE> &ae) {
            expression ().operator = (ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_reference &assign (const vector_expression<AE> &ae) {
            expression ().assign (ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_reference &operator += (const vector_expression<AE> &ae) {
            expression ().operator += (ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_reference &plus_assign (const vector_expression<AE> &ae) {
            expression ().plus_assign (ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_reference &operator -= (const vector_expression<AE> &ae) {
            expression ().operator -= (ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        vector_reference &minus_assign (const vector_expression<AE> &ae) {
            expression ().minus_assign (ae);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        vector_reference &operator *= (const AT &at) {
            expression ().operator *= (at);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        vector_reference &operator /= (const AT &at) {
            expression ().operator /= (at);
            return *this;
        }

        // Swapping
        BOOST_UBLAS_INLINE
        void swap (vector_reference &v) {
            expression ().swap (v.expression ());
        }

        // Closure comparison
        BOOST_UBLAS_INLINE
        bool same_closure (const vector_reference &vr) const {
            return &(*this).e_ == &vr.e_;
        }

        // Iterator types
#ifndef BOOST_UBLAS_CT_REFERENCE_BASE_TYPEDEFS
        typedef typename T::const_iterator const_iterator;
        typedef typename T::iterator iterator;
#else
        typedef typename T::const_iterator const_iterator;
        typedef typename boost::mpl::if_<boost::is_const<T>,
                                          typename T::const_iterator,
                                          typename T::iterator>::type iterator;
#endif

        // Element lookup
        BOOST_UBLAS_INLINE
        const_iterator find (size_type i) const {
            return expression ().find (i);
        }
        BOOST_UBLAS_INLINE
        iterator find (size_type i) {
            return expression ().find (i);
        }

        // Iterator is the iterator of the referenced expression.

        BOOST_UBLAS_INLINE
        const_iterator begin () const {
            return expression ().begin ();
        }
        BOOST_UBLAS_INLINE
        const_iterator end () const {
            return expression ().end ();
        }

        BOOST_UBLAS_INLINE
        iterator begin () {
            return expression ().begin ();
        }
        BOOST_UBLAS_INLINE
        iterator end () {
            return expression ().end ();
        }

        // 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:
        refered_type &e_;
        static refered_type nil_;
    };

    template<class T>
    typename vector_reference<T>::refered_type vector_reference<T>::nil_
#ifdef BOOST_UBLAS_STATIC_OLD_INIT
        = BOOST_UBLAS_TYPENAME vector_reference<T>::refered_type ()
#endif
    ;

    template<class E, class F>
    class vector_unary:
        public vector_expression<vector_unary<E, F> > {
    public:
#ifndef BOOST_UBLAS_NO_PROXY_SHORTCUTS
        BOOST_UBLAS_USING vector_expression<vector_unary<E, F> >::operator ();
#endif
        typedef typename boost::mpl::if_<boost::is_same<F,
                                                         scalar_identity<typename E::value_type> >,
                                          E,
                                          const E>::type expression_type;
        typedef typename E::size_type size_type;
        typedef typename E::difference_type difference_type;
        typedef typename F::result_type value_type;
        typedef value_type const_reference;
        typedef typename boost::mpl::if_<boost::is_same<F,
                                                         scalar_identity<value_type> >,
                                          typename E::reference,
                                          value_type>::type reference;
    private:
        typedef const value_type *const_pointer;
        typedef F functor_type;
        typedef typename boost::mpl::if_<boost::is_const<expression_type>,
                                          typename E::const_closure_type,
                                          typename E::closure_type>::type expression_closure_type;
        typedef vector_unary<E, F> self_type;
    public:
        typedef const self_type const_closure_type;
        typedef self_type closure_type;
        typedef unknown_storage_tag storage_category;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        vector_unary ():
            e_ () {}
        BOOST_UBLAS_INLINE
        // ISSUE may be used as mutable expression.
        // vector_unary (const expression_type &e):
        explicit vector_unary (expression_type &e):
            e_ (e) {}

        // Accessors
        BOOST_UBLAS_INLINE
        size_type size () const {
            return e_.size ();
        }

#ifndef BOOST_UBLAS_NESTED_CLASS_DR45
    private:
#endif
        // Expression accessors
        BOOST_UBLAS_INLINE
        const expression_closure_type &expression () const {
            return e_;
        }

    public:
        // Element access
        BOOST_UBLAS_INLINE
        const_reference operator () (size_type i) const {
            return functor_type::apply (e_ (i));
        }
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) {
            BOOST_STATIC_ASSERT ((boost::is_same<functor_type, scalar_identity<value_type > >::value));
            return e_ (i);
        }

        BOOST_UBLAS_INLINE
        const_reference operator [] (size_type i) const {
            return functor_type::apply (e_ [i]);
        }
        BOOST_UBLAS_INLINE
        reference operator [] (size_type i) {
            BOOST_STATIC_ASSERT ((boost::is_same<functor_type, scalar_identity<value_type > >::value));
            return e_ [i];
        }

        // Closure comparison
        BOOST_UBLAS_INLINE
        bool same_closure (const vector_unary &vu) const {
            return (*this).expression ().same_closure (vu.expression ());
        }

        // Iterator types
    private:
        typedef typename E::const_iterator const_iterator_type;

    public:
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
        typedef indexed_const_iterator<const_closure_type, typename const_iterator_type::iterator_category> const_iterator;
        typedef const_iterator iterator;
#else
        class const_iterator;
        typedef const_iterator iterator;
#endif

        // Element lookup
        BOOST_UBLAS_INLINE
        const_iterator find (size_type i) const {
#ifdef BOOST_UBLAS_USE_INDEXED_ITERATOR
            const_iterator_type it (e_.find (i));
            return const_iterator (*this, it.index ());
#else
            return const_iterator (*this, e_.find (i));
#endif
        }

        // Iterator enhances the iterator of the referenced expression
        // with the unary functor.

#ifndef BOOST_UBLAS_USE_INDEXED_ITERATOR
        class const_iterator:
            public container_const_reference<vector_unary>,
#ifndef BOOST_UBLAS_NO_ITERATOR_BASE_TRAITS
            public iterator_base_traits<typename E::const_iterator::iterator_category>::template
                        iterator_base<const_iterator, value_type>::type {
#else
            public random_access_iterator_base<typename E::const_iterator::iterator_category,
                                               const_iterator, value_type> {
#endif
        public:
            typedef typename E::const_iterator::iterator_category iterator_category;
#ifdef BOOST_MSVC_STD_ITERATOR
            typedef const_reference reference;
#else
            typedef typename vector_unary::difference_type difference_type;
            typedef typename vector_unary::value_type value_type;
            typedef typename vector_unary::const_reference reference;
            typedef typename vector_unary::const_pointer pointer;
#endif

            // Construction and destruction
            BOOST_UBLAS_INLINE
            const_iterator ():
                container_const_reference<self_type> (), it_ () {}
            BOOST_UBLAS_INLINE
            const_iterator (const self_type &vu, const const_iterator_type &it):
                container_const_reference<self_type> (vu), 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 {
                return functor_type::apply (*it_);
            }

            // 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_;