traits.hpp

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    struct type_traits<std::complex<double> > : complex_traits<std::complex<double> >{
        typedef type_traits<std::complex<double> > self_type;
        typedef std::complex<double> value_type;
        typedef const value_type &const_reference;
        typedef value_type &reference;
        typedef double real_type;
        typedef std::complex<long double> precision_type;
    };
    template<>
    struct type_traits<std::complex<long double> > : complex_traits<std::complex<long double> > {
        typedef type_traits<std::complex<long double> > self_type;
        typedef std::complex<long double> value_type;
        typedef const value_type &const_reference;
        typedef value_type &reference;
        typedef long double real_type;
        typedef value_type precision_type;
    };

#ifdef BOOST_UBLAS_USE_INTERVAL
    // Define scalar interval type traits
    template<>
    struct type_traits<boost::numeric::interval<float> > : scalar_traits<boost::numeric::interval<float> > {
        typedef type_traits<boost::numeric::interval<float> > self_type;
        typedef boost::numeric::interval<float> value_type;
        typedef const value_type &const_reference;
        typedef value_type &reference;
        typedef value_type real_type;
        typedef boost::numeric::interval<double> precision_type;

    };
    template<>
    struct type_traits<boost::numeric::interval<double> > : scalar_traits<boost::numeric::interval<double> > {
        typedef type_traits<boost::numeric::interval<double> > self_type;
        typedef boost::numeric::interval<double> value_type;
        typedef const value_type &const_reference;
        typedef value_type &reference;
        typedef value_type real_type;
        typedef boost::numeric::interval<long double> precision_type;
    };
    template<>
    struct type_traits<boost::numeric::interval<long double> > : scalar_traits<boost::numeric::interval<long double> > {
        typedef type_traits<boost::numeric::interval<long double> > self_type;
        typedef boost::numeric::interval<long double> value_type;
        typedef const value_type &const_reference;
        typedef value_type &reference;
        typedef value_type real_type;
        typedef value_type precision_type;
    };
#endif


    // Storage tags -- hierarchical definition of storage characteristics

    struct unknown_storage_tag {};
    struct sparse_proxy_tag: public unknown_storage_tag {};
    struct sparse_tag: public sparse_proxy_tag {};
    struct packed_proxy_tag: public sparse_proxy_tag {};
    struct packed_tag: public packed_proxy_tag {};
    struct dense_proxy_tag: public packed_proxy_tag {};
    struct dense_tag: public dense_proxy_tag {};

    template<class S1, class S2>
    struct storage_restrict_traits {
        typedef S1 storage_category;
    };

    template<>
    struct storage_restrict_traits<sparse_tag, dense_proxy_tag> {
        typedef sparse_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<sparse_tag, packed_proxy_tag> {
        typedef sparse_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<sparse_tag, sparse_proxy_tag> {
        typedef sparse_proxy_tag storage_category;
    };

    template<>
    struct storage_restrict_traits<packed_tag, dense_proxy_tag> {
        typedef packed_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<packed_tag, packed_proxy_tag> {
        typedef packed_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<packed_tag, sparse_proxy_tag> {
        typedef sparse_proxy_tag storage_category;
    };

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

    template<>
    struct storage_restrict_traits<dense_tag, dense_proxy_tag> {
        typedef dense_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<dense_tag, packed_proxy_tag> {
        typedef packed_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<dense_tag, sparse_proxy_tag> {
        typedef sparse_proxy_tag storage_category;
    };

    template<>
    struct storage_restrict_traits<dense_proxy_tag, packed_proxy_tag> {
        typedef packed_proxy_tag storage_category;
    };
    template<>
    struct storage_restrict_traits<dense_proxy_tag, sparse_proxy_tag> {
        typedef sparse_proxy_tag storage_category;
    };


    // Iterator tags -- hierarchical definition of storage characteristics

    struct sparse_bidirectional_iterator_tag : public std::bidirectional_iterator_tag {};
    struct packed_random_access_iterator_tag : public std::random_access_iterator_tag {};
    struct dense_random_access_iterator_tag : public packed_random_access_iterator_tag {};

    // Thanks to Kresimir Fresl for convincing Comeau with iterator_base_traits ;-)
    template<class IC>
    struct iterator_base_traits {};

    template<>
    struct iterator_base_traits<std::forward_iterator_tag> {
        template<class I, class T>
        struct iterator_base {
            typedef forward_iterator_base<std::forward_iterator_tag, I, T> type;
        };
    };

    template<>
    struct iterator_base_traits<std::bidirectional_iterator_tag> {
        template<class I, class T>
        struct iterator_base {
            typedef bidirectional_iterator_base<std::bidirectional_iterator_tag, I, T> type;
        };
    };
    template<>
    struct iterator_base_traits<sparse_bidirectional_iterator_tag> {
        template<class I, class T>
        struct iterator_base {
            typedef bidirectional_iterator_base<sparse_bidirectional_iterator_tag, I, T> type;
        };
    };

    template<>
    struct iterator_base_traits<std::random_access_iterator_tag> {
        template<class I, class T>
        struct iterator_base {
            typedef random_access_iterator_base<std::random_access_iterator_tag, I, T> type;
        };
    };
    template<>
    struct iterator_base_traits<packed_random_access_iterator_tag> {
        template<class I, class T>
        struct iterator_base {
            typedef random_access_iterator_base<packed_random_access_iterator_tag, I, T> type;
        };
    };
    template<>
    struct iterator_base_traits<dense_random_access_iterator_tag> {
        template<class I, class T>
        struct iterator_base {
            typedef random_access_iterator_base<dense_random_access_iterator_tag, I, T> type;
        };
    };

    template<class I1, class I2>
    struct iterator_restrict_traits {
        typedef I1 iterator_category;
    };

    template<>
    struct iterator_restrict_traits<packed_random_access_iterator_tag, sparse_bidirectional_iterator_tag> {
        typedef sparse_bidirectional_iterator_tag iterator_category;
    };
    template<>
    struct iterator_restrict_traits<sparse_bidirectional_iterator_tag, packed_random_access_iterator_tag> {
        typedef sparse_bidirectional_iterator_tag iterator_category;
    };

    template<>
    struct iterator_restrict_traits<dense_random_access_iterator_tag, sparse_bidirectional_iterator_tag> {
        typedef sparse_bidirectional_iterator_tag iterator_category;
    };
    template<>
    struct iterator_restrict_traits<sparse_bidirectional_iterator_tag, dense_random_access_iterator_tag> {
        typedef sparse_bidirectional_iterator_tag iterator_category;
    };

    template<>
    struct iterator_restrict_traits<dense_random_access_iterator_tag, packed_random_access_iterator_tag> {
        typedef packed_random_access_iterator_tag iterator_category;
    };
    template<>
    struct iterator_restrict_traits<packed_random_access_iterator_tag, dense_random_access_iterator_tag> {
        typedef packed_random_access_iterator_tag iterator_category;
    };

    template<class I>
    BOOST_UBLAS_INLINE
    void increment (I &it, const I &it_end, typename I::difference_type compare, packed_random_access_iterator_tag) {
        it += (std::min) (compare, it_end - it);
    }
    template<class I>
    BOOST_UBLAS_INLINE
    void increment (I &it, const I &/* it_end */, typename I::difference_type /* compare */, sparse_bidirectional_iterator_tag) {
        ++ it;
    }
    template<class I>
    BOOST_UBLAS_INLINE
    void increment (I &it, const I &it_end, typename I::difference_type compare) {
        increment (it, it_end, compare, typename I::iterator_category ());
    }

    template<class I>
    BOOST_UBLAS_INLINE
    void increment (I &it, const I &it_end) {
#if BOOST_UBLAS_TYPE_CHECK
        I cit (it);
        while (cit != it_end) {
            BOOST_UBLAS_CHECK (*cit == typename I::value_type/*zero*/(), internal_logic ());
            ++ cit;
        }
#endif
        it = it_end;
    }

    namespace detail {

        // specialisation which define whether a type has a trivial constructor
        // or not. This is used by array types.
        template<typename T>
        struct has_trivial_constructor : public boost::has_trivial_constructor<T> {};

        template<typename T>
        struct has_trivial_destructor : public boost::has_trivial_destructor<T> {};

        template<typename FLT>
        struct has_trivial_constructor<std::complex<FLT> > : public boost::true_type {};
        
        template<typename FLT>
        struct has_trivial_destructor<std::complex<FLT> > : public boost::true_type {};

    }

}}}

#endif