xref: /aoo42x/main/basebmp/inc/basebmp/accessor.hxx (revision cdf0e10c)

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#ifndef INCLUDED_BASEBMP_ACCESSOR_HXX
#define INCLUDED_BASEBMP_ACCESSOR_HXX

#include <vigra/numerictraits.hxx>

namespace basebmp
{

/** Standard accessor type

    Accesses the iterator values the standard way (i.e. via
    *operator()/operator[])
 */
template<typename ValueType> class StandardAccessor
{
public:
    typedef ValueType value_type;

    // -------------------------------------------------------

    template< class Iterator >
    value_type operator()(Iterator const& i) const
    {
        return *i;
    }

    template< class Iterator, class Difference >
    value_type operator()(Iterator const& i, Difference const& diff) const
    {
        return i[diff];
    }

    // -------------------------------------------------------

    template< typename V, class Iterator >
    void set(V const& value, Iterator const& i) const
    {
        *i = vigra::detail::RequiresExplicitCast<value_type>::cast(value);
    }

    template< typename V, class Iterator, class Difference >
    void set(V const& value, Iterator const& i, Difference const& diff) const
    {
        i[diff] = vigra::detail::RequiresExplicitCast<value_type>::cast(value);
    }
};

//-----------------------------------------------------------------------------

/** Non-standard accessor type

    Uses getter/setter methods at the given iterator type, to access
    the underlying values.
 */
template<typename ValueType> class NonStandardAccessor
{
public:
    typedef ValueType value_type;

    // -------------------------------------------------------

    template< class Iterator >
    value_type operator()(Iterator const& i) const
    {
        return i.get();
    }

    template< class Iterator, class Difference >
    value_type operator()(Iterator const& i, Difference const& diff) const
    {
        return i.get(diff);
    }

    // -------------------------------------------------------

    template< typename V, class Iterator >
    void set(V const& value, Iterator const& i) const
    {
        i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value) );
    }

    template< typename V, class Iterator, class Difference >
    void set(V const& value, Iterator const& i, Difference const& diff) const
    {
        i.set( vigra::detail::RequiresExplicitCast<value_type>::cast(value),
               diff );
    }
};

} // namespace basebmp

#endif /* INCLUDED_BASEBMP_ACCESSOR_HXX */