vector_assign.hpp

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            while (-- size >= 0)
                functor_type () (*it, value_type ()), ++ it;
        } else {
            it += size;
        }
#ifdef BOOST_UBLAS_TYPE_CHECK
        if (! disable_type_check)
            BOOST_UBLAS_CHECK (equals (v, cv), external_logic ());
#endif
    }
    // Sparse case
    template<class F, class V, class E>
    // This function seems to be big. So we do not let the compiler inline it.
    // BOOST_UBLAS_INLINE
    void vector_assign (F, V &v, const vector_expression<E> &e, sparse_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F functor_type;
        typedef typename V::value_type value_type;
#ifdef BOOST_UBLAS_TYPE_CHECK
        vector<value_type> cv (v.size ());
#ifndef BOOST_UBLAS_NO_ELEMENT_PROXIES
        indexing_vector_assign (scalar_assign<typename vector<value_type>::reference, value_type> (), cv, v);
        indexing_vector_assign (functor_type::template make_debug_functor<typename vector<value_type>::reference, value_type> (), cv, e);
#else
        indexing_vector_assign (scalar_assign<value_type, value_type> (), cv, v);
        indexing_vector_assign (functor_type (), cv, e);
#endif
#endif
        v.clear ();
        typename E::const_iterator ite (e ().begin ());
        typename E::const_iterator ite_end (e ().end ());
        while (ite != ite_end) {
            value_type t (*ite);
            if (t != value_type ())
                v.insert (ite.index (), t);
            ++ ite;
        }
#ifdef BOOST_UBLAS_TYPE_CHECK
        if (! disable_type_check)
            BOOST_UBLAS_CHECK (equals (v, cv), external_logic ());
#endif
    }
    // Sparse proxy case
    template<class F, class V, class E>
    // This function seems to be big. So we do not let the compiler inline it.
    // BOOST_UBLAS_INLINE
    void vector_assign (F, V &v, const vector_expression<E> &e, sparse_proxy_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F functor_type;
        typedef typename V::size_type size_type;
        typedef typename V::value_type value_type;
        typedef typename V::reference reference;
#ifdef BOOST_UBLAS_TYPE_CHECK
        vector<value_type> cv (v.size ());
#ifndef BOOST_UBLAS_NO_ELEMENT_PROXIES
        indexing_vector_assign (scalar_assign<typename vector<value_type>::reference, value_type> (), cv, v);
        indexing_vector_assign (functor_type::template make_debug_functor<typename vector<value_type>::reference, value_type> (), cv, e);
#else
        indexing_vector_assign (scalar_assign<value_type, value_type> (), cv, v);
        indexing_vector_assign (functor_type (), cv, e);
#endif
#endif
        typename V::iterator it (v.begin ());
        typename V::iterator it_end (v.end ());
        typename E::const_iterator ite (e ().begin ());
        typename E::const_iterator ite_end (e ().end ());
        while (it != it_end && ite != ite_end) {
            int compare = it.index () - ite.index ();
            if (compare == 0) {
                functor_type () (*it, *ite);
                ++ it, ++ ite;
            } else if (compare < 0) {
                functor_type () (*it, value_type ());
                ++ it;
            } else if (compare > 0) {
#ifdef BOOST_UBLAS_NON_CONFORMANT_PROXIES
                // Sparse proxies don't need to be conformant.
                // Thanks to Michael Stevens for suggesting this.
                size_type index (ite.index ());
                // FIX: reduce fill in.
                // functor_type () (v (index), e () (index));
                value_type t (*ite);
                if (t != value_type ()) {
                    functor_type () (v (index), t);
                    restart (v, index, it, it_end);
                    // The proxies could reference the same container.
                    restart (e, index, ite, ite_end);
                } else {
                    ++ ite;
                }
#else
                ++ ite;
#endif
            }
        }
#ifdef BOOST_UBLAS_NON_CONFORMANT_PROXIES
        while (ite != ite_end) {
            // Sparse proxies don't need to be conformant.
            // Thanks to Michael Stevens for suggesting this.
            size_type index (ite.index ());
            // FIX: reduce fill in.
            // functor_type () (v (index), e () (index));
            value_type t (*ite);
            if (t != value_type ()) {
                functor_type () (v (index), t);
                restart (v, index, it, it_end);
                // The proxies could reference the same container.
                restart (e, index, ite, ite_end);
            } else {
                ++ ite;
            }
        }
#endif
        if (boost::is_same<BOOST_UBLAS_TYPENAME functor_type::assign_category, assign_tag>::value) {
            while (it != it_end) {
                functor_type () (*it, value_type ());
                ++ it;
            }
        } else {
            it = it_end;
        }
#ifdef BOOST_UBLAS_TYPE_CHECK
        if (! disable_type_check)
            BOOST_UBLAS_CHECK (equals (v, cv), external_logic ());
#endif
    }

    // Dispatcher
    template<class F, class V, class E>
    BOOST_UBLAS_INLINE
    void vector_assign (F, V &v, const vector_expression<E> &e) {
        typedef F functor_type;
        typedef typename vector_assign_traits<BOOST_UBLAS_TYPENAME V::storage_category,
                                              BOOST_UBLAS_TYPENAME F::assign_category,
                                              BOOST_UBLAS_TYPENAME E::const_iterator::iterator_category>::storage_category storage_category;
        vector_assign (functor_type (), v, e, storage_category ());
    }

    template<class LS, class RI>
    struct vector_swap_traits {
        typedef LS storage_category;
    };

    template<>
    struct vector_swap_traits<dense_proxy_tag, sparse_bidirectional_iterator_tag> {
        typedef sparse_proxy_tag storage_category;
    };

    template<>
    struct vector_swap_traits<packed_proxy_tag, sparse_bidirectional_iterator_tag> {
        typedef sparse_proxy_tag storage_category;
    };

    // Dense (proxy) case
    template<class F, class V, class E>
    // This function seems to be big. So we do not let the compiler inline it.
    // BOOST_UBLAS_INLINE
    void vector_swap (F, V &v, vector_expression<E> &e, dense_proxy_tag) {
        typedef F functor_type;
        typedef typename V::difference_type difference_type;
        difference_type size (BOOST_UBLAS_SAME (v.size (), e ().size ()));
        typename V::iterator it (v.begin ());
        typename E::iterator ite (e ().begin ());
        while (-- size >= 0)
            functor_type () (*it, *ite), ++ it, ++ ite;
    }
    // Packed (proxy) case
    template<class F, class V, class E>
    // This function seems to be big. So we do not let the compiler inline it.
    // BOOST_UBLAS_INLINE
    void vector_swap (F, V &v, vector_expression<E> &e, packed_proxy_tag) {
        typedef F functor_type;
        typedef typename V::difference_type difference_type;
        typename V::iterator it (v.begin ());
        typename V::iterator it_end (v.end ());
        typename E::iterator ite (e ().begin ());
        typename E::iterator ite_end (e ().end ());
        difference_type it_size (it_end - it);
        difference_type ite_size (ite_end - ite);
        if (it_size > 0 && ite_size > 0) {
            difference_type size (std::min (difference_type (it.index () - ite.index ()), ite_size));
            if (size > 0) {
                ite += size;
                ite_size -= size;
            }
        }
        if (it_size > 0 && ite_size > 0) {
            difference_type size (std::min (difference_type (ite.index () - it.index ()), it_size));
            if (size > 0)
                it_size -= size;
        }
        difference_type size (std::min (it_size, ite_size));
        it_size -= size;
        ite_size -= size;
        while (-- size >= 0)
            functor_type () (*it, *ite), ++ it, ++ ite;
    }
    // Sparse proxy case
    template<class F, class V, class E>
    // This function seems to be big. So we do not let the compiler inline it.
    // BOOST_UBLAS_INLINE
    void vector_swap (F, V &v, vector_expression<E> &e, sparse_proxy_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F functor_type;
        typedef typename V::size_type size_type;
        typedef typename V::value_type value_type;
        typename V::iterator it (v.begin ());
        typename V::iterator it_end (v.end ());
        typename E::iterator ite (e ().begin ());
        typename E::iterator ite_end (e ().end ());
        while (it != it_end && ite != ite_end) {
            int compare = it.index () - ite.index ();
            if (compare == 0) {
                functor_type () (*it, *ite);
                ++ it, ++ ite;
            } else if (compare < 0) {
#ifdef BOOST_UBLAS_NON_CONFORMANT_PROXIES
                // Sparse proxies don't need to be conformant.
                // Thanks to Michael Stevens for suggesting this.
                size_type index (it.index ());
                // FIX: reduce fill in.
                // functor_type () (v (index), e () (index));
                value_type t (*it);
                if (t != value_type ()) {
                    functor_type () (v (index), e () (index));
                    restart (v, index, it, it_end);
                    // The proxies could reference the same container.
                    restart (e, index, ite, ite_end);
                } else {
                    ++ it;
                }
#else
                ++ it;
#endif
            } else if (compare > 0) {
#ifdef BOOST_UBLAS_NON_CONFORMANT_PROXIES
                // Sparse proxies don't need to be conformant.
                // Thanks to Michael Stevens for suggesting this.
                size_type index (ite.index ());
                // FIX: reduce fill in.
                // functor_type () (v (index), e () (index));
                value_type t (*ite);
                if (t != value_type ()) {
                    functor_type () (v (index), e () (index));
                    restart (e, index, ite, ite_end);
                    // The proxies could reference the same container.
                    restart (v, index, it, it_end);
                } else {
                    ++ ite;
                }
#else
                ++ ite;
#endif
            }
        }
#ifdef BOOST_UBLAS_NON_CONFORMANT_PROXIES
        while (ite != ite_end) {
            // Sparse proxies don't need to be conformant.
            // Thanks to Michael Stevens for suggesting this.
            size_type index (ite.index ());
            // FIX: reduce fill in.
            // functor_type () (v (index), e () (index));
            value_type t (*ite);
            if (t != value_type ()) {
                functor_type () (v (index), e () (index));
                // The proxies could reference the same container.
                restart (e, index, ite, ite_end);
                restart (v, index, it, it_end);
            } else {
                ++ ite;
            }
        }
        while (it != it_end) {
            // Sparse proxies don't need to be conformant.
            // Thanks to Michael Stevens for suggesting this.
            size_type index (it.index ());
            // FIX: reduce fill in.
            // functor_type () (v (index), e () (index));
            value_type t (*it);
            if (t != value_type ()) {
                functor_type () (v (index), e () (index));
                // The proxies could reference the same container.
                restart (v, index, it, it_end);
                restart (e, index, ite, ite_end);
            } else {
                ++ it;
            }
        }
#endif
    }

    // Dispatcher
    template<class F, class V, class E>
    BOOST_UBLAS_INLINE
    void vector_swap (F, V &v, vector_expression<E> &e) {
        typedef F functor_type;
        typedef typename vector_swap_traits<BOOST_UBLAS_TYPENAME V::storage_category,
                                            BOOST_UBLAS_TYPENAME E::const_iterator::iterator_category>::storage_category storage_category;
        vector_swap (functor_type (), v, e, storage_category ());
    }

}}}

#endif