shadowee_traits.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
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 *  The Original Code is LASS - Library of Assembled Shared Sources.
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 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
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#ifndef LASS_GUARDIAN_OF_INCLUSION_PYTHON_SHADOWEE_TRAITS_H
#define LASS_GUARDIAN_OF_INCLUSION_PYTHON_SHADOWEE_TRAITS_H
 
#include "python_common.h"
#include "../meta/bool.h"
 
namespace lass
{
namespace python
{
 
/** @ingroup Python
 *  @internal
 *  Tells whether a type has a shadow class, and its type TShadow
 *  By default, this is false.  Must be specialized by shadow classes ...
 *
 *  ShadoweeTraits shall be (partially) specialized for all shadwowee types.
 *  It shall derive from meta::True and define the following types:
 *  @arg TShadow: the shadow type (obvious)
 *  @arg TPointerTraits: ...
 *
 *  ShadoweeTraits for non-shadowee types shall derive from meta::False and
 *  won't define these types.
 */
template <typename T> 
struct ShadoweeTraits: public meta::False 
{
    typedef T TShadow;
    // typedef ... TShadowTraits;
    // typedef ... TPointerTraits;
};
 
namespace impl
{
 
template <typename T, bool isShadowee>
struct ConstShadoweeTraits: ShadoweeTraits<T>
{
    typedef typename ShadoweeTraits<T>::TShadow TShadow;
    //typedef typename ShadoweeTraits<T>::TShadowTraits TShadowTraits;
    typedef typename ShadoweeTraits<T>::TPointerTraits::template Rebind<const T>::Type TPointerTraits;
};
template <typename T>
struct ConstShadoweeTraits<T, false>: public meta::False
{
    typedef T TShadow;
};
 
}
 
/** @ingroup Python
 *  @internal
 *  const types have the same shadowee traits as non const types ...
 */
template <typename T> 
struct ShadoweeTraits<const T>: public impl::ConstShadoweeTraits<T, ShadoweeTraits<T>::value>
{
};
 
}
}
 
#endif