vector_sparse.hpp

support vector clustering for vc++

        BOOST_UBLAS_INLINE
        void resize (size_type size, bool preserve = true) {
            size_ = size;
            if (preserve) {
                data ().erase (data ().lower_bound(size_), data ().end());
            }
            else {
                data ().clear ();
            }
        }

        // Reserving
        BOOST_UBLAS_INLINE
        void reserve (size_type non_zeros = 0, bool preserve = true) {
            detail::map_reserve (data (), restrict_capacity (non_zeros));
        }

        // Element support
        BOOST_UBLAS_INLINE
        pointer find_element (size_type i) {
            return const_cast<pointer> (const_cast<const self_type&>(*this).find_element (i));
        }
        BOOST_UBLAS_INLINE
        const_pointer find_element (size_type i) const {
            const_subiterator_type it (data ().find (i));
            if (it == data ().end ())
                return 0;
            BOOST_UBLAS_CHECK ((*it).first == i, internal_logic ());   // broken map
            return &(*it).second;
        }

        // Element access
        BOOST_UBLAS_INLINE
        const_reference operator () (size_type i) const {
            BOOST_UBLAS_CHECK (i < size_, bad_index ());
            const_subiterator_type it (data ().find (i));
            if (it == data ().end ())
                return zero_;
            BOOST_UBLAS_CHECK ((*it).first == i, internal_logic ());   // broken map
            return (*it).second;
        }
        BOOST_UBLAS_INLINE
        true_reference ref (size_type i) {
            BOOST_UBLAS_CHECK (i < size_, bad_index ());
            std::pair<subiterator_type, bool> ii (data ().insert (typename array_type::value_type (i, value_type/*zero*/())));
            BOOST_UBLAS_CHECK ((ii.first)->first == i, internal_logic ());   // broken map
            return (ii.first)->second;
        }
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) {
#ifndef BOOST_UBLAS_STRICT_VECTOR_SPARSE
            return ref (i);
#else
            BOOST_UBLAS_CHECK (i < size_, bad_index ());
            return reference (*this, i);
#endif
        }

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

        // Element assignment
        BOOST_UBLAS_INLINE
        true_reference insert_element (size_type i, const_reference t) {
            std::pair<subiterator_type, bool> ii = data ().insert (typename array_type::value_type (i, t));
            BOOST_UBLAS_CHECK (ii.second, bad_index ());        // duplicate element
            BOOST_UBLAS_CHECK ((ii.first)->first == i, internal_logic ());   // broken map
            if (!ii.second)     // existing element
                (ii.first)->second = t;
            return (ii.first)->second;
        }
        BOOST_UBLAS_INLINE
        void erase_element (size_type i) {
            subiterator_type it = data ().find (i);
            if (it == data ().end ())
                return;
            data ().erase (it);
        }
        
        // Zeroing
        BOOST_UBLAS_INLINE
        void clear () {
            data ().clear ();
        }

        // Assignment
        BOOST_UBLAS_INLINE
        mapped_vector &operator = (const mapped_vector &v) {
            if (this != &v) {
                size_ = v.size_;
                data () = v.data ();
            }
            return *this;
        }
        template<class C>          // Container assignment without temporary
        BOOST_UBLAS_INLINE
        mapped_vector &operator = (const vector_container<C> &v) {
            resize (v ().size (), false);
            assign (v);
            return *this;
        }
        BOOST_UBLAS_INLINE
        mapped_vector &assign_temporary (mapped_vector &v) {
            swap (v);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        mapped_vector &operator = (const vector_expression<AE> &ae) {
            self_type temporary (ae, detail::map_capacity (data()));
            return assign_temporary (temporary);
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        mapped_vector &assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_assign> (*this, ae);
            return *this;
        }

        // Computed assignment
        template<class AE>
        BOOST_UBLAS_INLINE
        mapped_vector &operator += (const vector_expression<AE> &ae) {
            self_type temporary (*this + ae, detail::map_capacity (data()));
            return assign_temporary (temporary);
        }
        template<class C>          // Container assignment without temporary
        BOOST_UBLAS_INLINE
        mapped_vector &operator += (const vector_container<C> &v) {
            plus_assign (v);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        mapped_vector &plus_assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_plus_assign> (*this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        mapped_vector &operator -= (const vector_expression<AE> &ae) {
            self_type temporary (*this - ae, detail::map_capacity (data()));
            return assign_temporary (temporary);
        }
        template<class C>          // Container assignment without temporary
        BOOST_UBLAS_INLINE
        mapped_vector &operator -= (const vector_container<C> &v) {
            minus_assign (v);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        mapped_vector &minus_assign (const vector_expression<AE> &ae) {
            vector_assign<scalar_minus_assign> (*this, ae);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        mapped_vector &operator *= (const AT &at) {
            vector_assign_scalar<scalar_multiplies_assign> (*this, at);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE
        mapped_vector &operator /= (const AT &at) {
            vector_assign_scalar<scalar_divides_assign> (*this, at);
            return *this;
        }

        // Swapping
        BOOST_UBLAS_INLINE
        void swap (mapped_vector &v) {
            if (this != &v) {
                std::swap (size_, v.size_);
                data ().swap (v.data ());
            }
        }
        BOOST_UBLAS_INLINE
        friend void swap (mapped_vector &v1, mapped_vector &v2) {
            v1.swap (v2);
        }

        // Iterator types
    private:
        // Use storage iterator
        typedef typename A::const_iterator const_subiterator_type;
        typedef typename A::iterator subiterator_type;

        BOOST_UBLAS_INLINE
        true_reference at_element (size_type i) {
            BOOST_UBLAS_CHECK (i < size_, bad_index ());
            subiterator_type it (data ().find (i));
            BOOST_UBLAS_CHECK (it != data ().end(), bad_index ());
            BOOST_UBLAS_CHECK ((*it).first == i, internal_logic ());   // broken map
            return it->second;
        }

    public:
        class const_iterator;
        class iterator;

        // Element lookup
        // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.    
        const_iterator find (size_type i) const {
            return const_iterator (*this, data ().lower_bound (i));
        }
        // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.    
        iterator find (size_type i) {
            return iterator (*this, data ().lower_bound (i));
        }


        class const_iterator:
            public container_const_reference<mapped_vector>,
            public bidirectional_iterator_base<sparse_bidirectional_iterator_tag,
                                               const_iterator, value_type> {
        public:
            typedef typename mapped_vector::value_type value_type;
            typedef typename mapped_vector::difference_type difference_type;
            typedef typename mapped_vector::const_reference reference;
            typedef const typename mapped_vector::pointer pointer;

            // Construction and destruction
            BOOST_UBLAS_INLINE
            const_iterator ():
                container_const_reference<self_type> (), it_ () {}
            BOOST_UBLAS_INLINE
            const_iterator (const self_type &v, const const_subiterator_type &it):
                container_const_reference<self_type> (v), 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;
            }

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

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                BOOST_UBLAS_CHECK (*this != (*this) ().end (), bad_index ());
                BOOST_UBLAS_CHECK ((*it_).first < (*this) ().size (), bad_index ());
                return (*it_).first;
            }

            // 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) () == &it (), external_logic ());
                return it_ == it.it_;
            }

        private:
            const_subiterator_type it_;
        };

        BOOST_UBLAS_INLINE
        const_iterator begin () const {
            return const_iterator (*this, data ().begin ());
        }
        BOOST_UBLAS_INLINE
        const_iterator end () const {
            return const_iterator (*this, data ().end ());
        }

        class iterator:
            public container_reference<mapped_vector>,
            public bidirectional_iterator_base<sparse_bidirectional_iterator_tag,
                                               iterator, value_type> {
        public:
            typedef typename mapped_vector::value_type value_type;
            typedef typename mapped_vector::difference_type difference_type;
            typedef typename mapped_vector::true_reference reference;
            typedef typename mapped_vector::pointer pointer;

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

            // Arithmetic
            BOOST_UBLAS_INLINE
            iterator &operator ++ () {
                ++ it_;
                return *this;
            }
            BOOST_UBLAS_INLINE
            iterator &operator -- () {
                -- it_;
                return *this;
            }

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

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                BOOST_UBLAS_CHECK (*this != (*this) ().end (), bad_index ());
                BOOST_UBLAS_CHECK ((*it_).first < (*this) ().size (), bad_index ());
                return (*it_).first;
            }

            // 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 {