vector_assign.hpp

support vector clustering for vc++

            iterating_vector_assign<F> (v, e);
        else
            indexing_vector_assign<F> (v, e);
#endif
    }
    // Packed (proxy) case
    template<template <class T1, class T2> class F, class V, class E>
    // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.
    void vector_assign (V &v, const vector_expression<E> &e, packed_proxy_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F<typename V::iterator::reference, typename E::value_type> functor_type;
        typedef typename V::difference_type difference_type;
        typedef typename V::value_type value_type;
#if BOOST_UBLAS_TYPE_CHECK
        vector<value_type> cv (v.size ());
        indexing_vector_assign<scalar_assign> (cv, v);
        indexing_vector_assign<F> (cv, e);
#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 ());
        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;
                if (!functor_type::computed) {
                    while (-- size >= 0)    // zeroing
                        functor_type::apply (*it, value_type/*zero*/()), ++ it;
                } else {
                    it += size;
                }
            }
        }
        difference_type size ((std::min) (it_size, ite_size));
        it_size -= size;
        ite_size -= size;
        while (-- size >= 0)
            functor_type::apply (*it, *ite), ++ it, ++ ite;
        size = it_size;
        if (!functor_type::computed) {
            while (-- size >= 0)    // zeroing
                functor_type::apply (*it, value_type/*zero*/()), ++ it;
        } else {
            it += size;
        }
#if BOOST_UBLAS_TYPE_CHECK
        if (! disable_type_check<bool>::value)
            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), external_logic ());
#endif
    }
    // Sparse case
    template<template <class T1, class T2> class F, class V, class E>
    // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.
    void vector_assign (V &v, const vector_expression<E> &e, sparse_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F<typename V::iterator::reference, typename E::value_type> functor_type;
        BOOST_STATIC_ASSERT ((!functor_type::computed));
        typedef typename V::value_type value_type;
#if BOOST_UBLAS_TYPE_CHECK
        vector<value_type> cv (v.size ());
        indexing_vector_assign<scalar_assign> (cv, v);
        indexing_vector_assign<F> (cv, e);
#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/*zero*/())
                v.insert_element (ite.index (), t);
            ++ ite;
        }
#if BOOST_UBLAS_TYPE_CHECK
        if (! disable_type_check<bool>::value)
            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), external_logic ());
#endif
    }
    // Sparse proxy or functional case
    template<template <class T1, class T2> class F, class V, class E>
    // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.
    void vector_assign (V &v, const vector_expression<E> &e, sparse_proxy_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F<typename V::iterator::reference, typename E::value_type> functor_type;
        typedef typename V::size_type size_type;
        typedef typename V::difference_type difference_type;
        typedef typename V::value_type value_type;
        typedef typename V::reference reference;
#if BOOST_UBLAS_TYPE_CHECK
        vector<value_type> cv (v.size ());
        indexing_vector_assign<scalar_assign> (cv, v);
        indexing_vector_assign<F> (cv, e);
#endif
        detail::make_conformant (v, e);

        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 ());
        if (it != it_end && ite != ite_end) {
            size_type it_index = it.index (), ite_index = ite.index ();
            while (true) {
                difference_type compare = it_index - ite_index;
                if (compare == 0) {
                    functor_type::apply (*it, *ite);
                    ++ it, ++ ite;
                    if (it != it_end && ite != ite_end) {
                        it_index = it.index ();
                        ite_index = ite.index ();
                    } else
                        break;
                } else if (compare < 0) {
                    if (!functor_type::computed) {
                        functor_type::apply (*it, value_type/*zero*/());
                        ++ it;
                    } else
                        increment (it, it_end, - compare);
                    if (it != it_end)
                        it_index = it.index ();
                    else
                        break;
                } else if (compare > 0) {
                    increment (ite, ite_end, compare);
                    if (ite != ite_end)
                        ite_index = ite.index ();
                    else
                        break;
                }
            }
        }

        if (!functor_type::computed) {
            while (it != it_end) {  // zeroing
                functor_type::apply (*it, value_type/*zero*/());
                ++ it;
            }
        } else {
            it = it_end;
        }
#if BOOST_UBLAS_TYPE_CHECK
        if (! disable_type_check<bool>::value)
            BOOST_UBLAS_CHECK (detail::expression_type_check (v, cv), external_logic ());
#endif
    }

    // Dispatcher
    template<template <class T1, class T2> class F, class V, class E>
    BOOST_UBLAS_INLINE
    void vector_assign (V &v, const vector_expression<E> &e) {
        typedef typename vector_assign_traits<typename V::storage_category,
                                              F<typename V::reference, typename E::value_type>::computed,
                                              typename E::const_iterator::iterator_category>::storage_category storage_category;
        vector_assign<F> (v, e, storage_category ());
    }

    template<class SC, class RI>
    struct vector_swap_traits {
        typedef SC 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<template <class T1, class T2> class F, class V, class E>
    // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.
    void vector_swap (V &v, vector_expression<E> &e, dense_proxy_tag) {
        typedef F<typename V::iterator::reference, typename E::iterator::reference> 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::apply (*it, *ite), ++ it, ++ ite;
    }
    // Packed (proxy) case
    template<template <class T1, class T2> class F, class V, class E>
    // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.
    void vector_swap (V &v, vector_expression<E> &e, packed_proxy_tag) {
        typedef F<typename V::iterator::reference, typename E::iterator::reference> 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::apply (*it, *ite), ++ it, ++ ite;
    }
    // Sparse proxy case
    template<template <class T1, class T2> class F, class V, class E>
    // BOOST_UBLAS_INLINE This function seems to be big. So we do not let the compiler inline it.
    void vector_swap (V &v, vector_expression<E> &e, sparse_proxy_tag) {
        BOOST_UBLAS_CHECK (v.size () == e ().size (), bad_size ());
        typedef F<typename V::iterator::reference, typename E::iterator::reference> functor_type;
        typedef typename V::size_type size_type;
        typedef typename V::difference_type difference_type;
        typedef typename V::value_type value_type;

        detail::make_conformant (v, e);
        // FIXME should be a seperate restriction for E
        detail::make_conformant (e (), v);

        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 ());
        if (it != it_end && ite != ite_end) {
            size_type it_index = it.index (), ite_index = ite.index ();
            while (true) {
                difference_type compare = it_index - ite_index;
                if (compare == 0) {
                    functor_type::apply (*it, *ite);
                    ++ it, ++ ite;
                    if (it != it_end && ite != ite_end) {
                        it_index = it.index ();
                        ite_index = ite.index ();
                    } else
                        break;
                } else if (compare < 0) {
                    increment (it, it_end, - compare);
                    if (it != it_end)
                        it_index = it.index ();
                    else
                        break;
                } else if (compare > 0) {
                    increment (ite, ite_end, compare);
                    if (ite != ite_end)
                        ite_index = ite.index ();
                    else
                        break;
                }
            }
        }

#if BOOST_UBLAS_TYPE_CHECK
        increment (ite, ite_end);
        increment (it, it_end);
#endif
    }

    // Dispatcher
    template<template <class T1, class T2> class F, class V, class E>
    BOOST_UBLAS_INLINE
    void vector_swap (V &v, vector_expression<E> &e) {
        typedef typename vector_swap_traits<typename V::storage_category,
                                            typename E::const_iterator::iterator_category>::storage_category storage_category;
        vector_swap<F> (v, e, storage_category ());
    }

}}}

#endif