vector_sparse.hpp

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

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

            // Dereference
            BOOST_UBLAS_INLINE
            reference operator * () const {
                BOOST_UBLAS_CHECK (index () < (*this) ().size (), bad_index ());
#if ! defined (BOOST_UBLAS_STRICT_STORAGE_SPARSE) && ! defined (BOOST_UBLAS_STRICT_VECTOR_SPARSE)
                return (*it_).second;
#elif defined (BOOST_UBLAS_STRICT_VECTOR_SPARSE)
                return reference ((*this) (), &(*it_).second, index ());
#elif defined (BOOST_UBLAS_STRICT_STORAGE_SPARSE)
                return detail::make_reference ((*this) ().data (), it_);
#endif
            }

            // Index
            BOOST_UBLAS_INLINE
            size_type index () const {
                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 {
                // FIXME: won't work with vector of vectors.
                // BOOST_UBLAS_CHECK (&(*this) () == &it (), external_logic ());
                return &(*this) () == &it () && it_ == it.it_;
            }

        private:
            iterator_type it_;

            friend class const_iterator;
        };

        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:
        size_type size_;
        size_type non_zeros_;
        array_type data_;
        static value_type zero_;
    };

    template<class T, class A>
    typename sparse_vector<T, A>::value_type sparse_vector<T, A>::zero_ =
        sparse_vector<T, A>::value_type ();

    // Array based sparse vector class
    // Thanks to Kresimir Fresl for extending this to cover different index bases.
    template<class T, std::size_t IB, class IA, class TA>
    class compressed_vector:
        public vector_expression<compressed_vector<T, IB, IA, TA> > {
    public:
#ifndef BOOST_UBLAS_NO_PROXY_SHORTCUTS
        BOOST_UBLAS_USING vector_expression<compressed_vector<T, IB, IA, TA> >::operator ();
#endif
        typedef std::size_t size_type;
        typedef std::ptrdiff_t difference_type;
        typedef T value_type;
        // typedef const T &const_reference;
        typedef typename type_traits<T>::const_reference const_reference;
#ifndef BOOST_UBLAS_STRICT_VECTOR_SPARSE
        typedef T &reference;
#else
        typedef sparse_vector_element<compressed_vector<T, IB, IA, TA> > reference;
#endif
        typedef const T *const_pointer;
        typedef T *pointer;
        typedef IA index_array_type;
        typedef TA value_array_type;
        typedef const compressed_vector<T, IB, IA, TA> const_self_type;
        typedef compressed_vector<T, IB, IA, TA> self_type;
#ifndef BOOST_UBLAS_CT_REFERENCE_BASE_TYPEDEFS
        typedef const vector_const_reference<const_self_type> const_closure_type;
#else
        typedef const vector_reference<const_self_type> const_closure_type;
#endif
        typedef vector_reference<self_type> closure_type;
        typedef typename IA::const_iterator const_iterator_type;
        typedef typename IA::iterator iterator_type;
        typedef sparse_tag storage_category;

        // Construction and destruction
        BOOST_UBLAS_INLINE
        compressed_vector ():
            vector_expression<self_type> (),
            size_ (0), non_zeros_ (0), filled_ (0),
            index_data_ (), value_data_ () {}
        BOOST_UBLAS_INLINE
        compressed_vector (size_type size, size_type non_zeros = 0):
            vector_expression<self_type> (),
            size_ (size), non_zeros_ (non_zeros), filled_ (0),
            index_data_ (non_zeros), value_data_ (non_zeros) {
            reserve (non_zeros_);
        }
        BOOST_UBLAS_INLINE
        compressed_vector (const compressed_vector &v):
            vector_expression<self_type> (),
            size_ (v.size_), non_zeros_ (v.non_zeros_), filled_ (v.filled_),
            index_data_ (v.index_data_), value_data_ (v.value_data_) {}
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector (const vector_expression<AE> &ae, size_type non_zeros = 0):
            vector_expression<self_type> (),
            size_ (ae ().size ()), non_zeros_ (non_zeros), filled_ (0),
            index_data_ (non_zeros), value_data_ (non_zeros) {
            reserve (non_zeros_, false);
            vector_assign (scalar_assign<reference, BOOST_UBLAS_TYPENAME AE::value_type> (), *this, ae);
        }

        // Accessors
        BOOST_UBLAS_INLINE
        size_type size () const {
            return size_;
        }
        BOOST_UBLAS_INLINE
        size_type non_zeros () const {
            return non_zeros_;
        }
        BOOST_UBLAS_INLINE
        size_type filled () const {
            return filled_;
        }
        BOOST_UBLAS_INLINE
        static size_type index_base () {
            return index_base_;
        }
        BOOST_UBLAS_INLINE
        const index_array_type &index_data () const {
            return index_data_;
        }
        BOOST_UBLAS_INLINE
        index_array_type &index_data () {
            return index_data_;
        }
        BOOST_UBLAS_INLINE
        const value_array_type &value_data () const {
            return value_data_;
        }
        BOOST_UBLAS_INLINE
        value_array_type &value_data () {
            return value_data_;
        }

        // Resizing
        BOOST_UBLAS_INLINE
        void resize (size_type size, size_type non_zeros = 0, bool preserve = true) {
            size_ = size;
            non_zeros_ = std::max (non_zeros, size_type (1));
            non_zeros_ = std::min (non_zeros_, size_);
            filled_ = 0;
            detail::resize (index_data (), non_zeros_, preserve);
            detail::resize (value_data (), non_zeros_, preserve);
        }

        // Reserving
        BOOST_UBLAS_INLINE
        void reserve (size_type non_zeros = 0, bool preserve = true) {
            non_zeros_ = std::max (non_zeros, size_type (1));
            non_zeros_ = std::min (non_zeros_, size_);
            detail::resize (index_data (), non_zeros_, preserve);
            detail::resize (value_data (), non_zeros_, preserve);
        }

        // Proxy support
#ifdef BOOST_UBLAS_STRICT_VECTOR_SPARSE
        pointer find_element (size_type i) {
            iterator_type it (detail::lower_bound (index_data ().begin (), index_data ().begin () + filled_, k_based (i), std::less<size_type> ()));
            if (it == index_data ().begin () + filled_ || *it != k_based (i))
                return 0;
            return &value_data () [it - index_data ().begin ()];
        }
#endif

        // Element access
        BOOST_UBLAS_INLINE
        const_reference operator () (size_type i) const {
            BOOST_UBLAS_CHECK (i < size_, bad_index ());
            const_iterator_type it (detail::lower_bound (index_data ().begin (), index_data ().begin () + filled_, k_based (i), std::less<size_type> ()));
            if (it == index_data ().begin () + filled_ || *it != k_based (i))
                return zero_;
            return value_data () [it - index_data ().begin ()];
        }
        BOOST_UBLAS_INLINE
        reference operator () (size_type i) {
            BOOST_UBLAS_CHECK (i < size_, bad_index ());
#ifndef BOOST_UBLAS_STRICT_VECTOR_SPARSE
            iterator_type it (detail::lower_bound (index_data ().begin (), index_data ().begin () + filled_, k_based (i), std::less<size_type> ()));
            if (it == index_data ().begin () + filled_ || *it != k_based (i)) {
                insert (i, value_type ());
                it = detail::lower_bound (index_data ().begin (), index_data ().begin () + filled_, k_based (i), std::less<size_type> ());
            }
            return value_data () [it - index_data ().begin ()];
#else
            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); 
        }

        // Assignment
        BOOST_UBLAS_INLINE
        compressed_vector &operator = (const compressed_vector &v) {
            // Too unusual semantic.
            // BOOST_UBLAS_CHECK (this != &v, external_logic ());
            if (this != &v) {
                // Precondition for container relaxed as requested during review.
                // BOOST_UBLAS_CHECK (size_ == v.size_, bad_size ());
                size_ = v.size_;
                non_zeros_ = v.non_zeros_;
                filled_ = v.filled_;
                detail::resize (index_data (), non_zeros_, false);
                detail::resize (value_data (), non_zeros_, false);
                index_data () = v.index_data ();
                value_data () = v.value_data ();
            }
            return *this;
        }
        BOOST_UBLAS_INLINE
        compressed_vector &assign_temporary (compressed_vector &v) { 
            swap (v);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &operator = (const vector_expression<AE> &ae) {
#ifdef BOOST_UBLAS_MUTABLE_TEMPORARY
            return assign_temporary (self_type (ae, non_zeros_));
#else
            // return assign (self_type (ae, non_zeros_));
            self_type temporary (ae, non_zeros_);
            return assign_temporary (temporary);
#endif
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &reset (const vector_expression<AE> &ae) {
            self_type temporary (ae, non_zeros_);
            resize (temporary.size (), non_zeros_, false);
            return assign_temporary (temporary);
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &assign (const vector_expression<AE> &ae) {
            vector_assign (scalar_assign<reference, BOOST_UBLAS_TYPENAME AE::value_type> (), *this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &operator += (const vector_expression<AE> &ae) {
#ifdef BOOST_UBLAS_MUTABLE_TEMPORARY
            return assign_temporary (self_type (*this + ae, non_zeros_));
#else
            // return assign (self_type (*this + ae, non_zeros_));
            self_type temporary (*this + ae, non_zeros_);
            return assign_temporary (temporary);
#endif
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &plus_assign (const vector_expression<AE> &ae) {
            vector_assign (scalar_plus_assign<reference, BOOST_UBLAS_TYPENAME AE::value_type> (), *this, ae);
            return *this;
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &operator -= (const vector_expression<AE> &ae) {
#ifdef BOOST_UBLAS_MUTABLE_TEMPORARY
            return assign_temporary (self_type (*this - ae, non_zeros_));
#else
            // return assign (self_type (*this - ae, non_zeros_));
            self_type temporary (*this - ae, non_zeros_);
            return assign_temporary (temporary);
#endif
        }
        template<class AE>
        BOOST_UBLAS_INLINE
        compressed_vector &minus_assign (const vector_expression<AE> &ae) {
            vector_assign (scalar_minus_assign<reference, BOOST_UBLAS_TYPENAME AE::value_type> (), *this, ae);
            return *this;
        }
        template<class AT>
        BOOST_UBLAS_INLINE