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Accounting for by-value conversions

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Convertibility checks now collect the auxiliary conversion data


[SVN r12189]
This commit is contained in:
Dave Abrahams
2002-01-01 18:47:32 +00:00
parent a7b8448107
commit ccd21d5254
1 changed files with 43 additions and 35 deletions
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78
include/boost/python/converter/class.hpp
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@@ -11,46 +11,54 @@
namespace boost { namespace python { namespace converter {
struct class_unwrapper_base
{
class_unwrapper_base(type_id_t sought_type);
void*
};
template <class T>
struct class_unwrapper
: private unwrapper<T&>
, private unwrapper<T const&>
, private unwrapper<T*>
, private unwrapper<T const*>
{
struct ref_unwrapper : unwrapper<T&>
{
bool convertible(PyObject* p) const
{
return p->ob_type == &SimpleType;
}
simple const& convert(PyObject* p, void*&) const
{
return static_cast<SimpleObject*>(p)->x;
}
};
# ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
struct const_ref_unwrapper : unwrapper<T const&>
{
bool convertible(PyObject* p) const
{
return p->ob_type == &SimpleType;
}
simple const& convert(PyObject* p, void*&) const
{
return static_cast<SimpleObject*>(p)->x;
}
};
# endif
private:
void* can_convert(PyObject*) const;
T& convert(PyObject*, void*, boost::type<T&>) const;
T const& convert(PyObject*, void*, boost::type<T const&>) const;
T* convert(PyObject*, void*, boost::type<T*>) const;
T const* convert(PyObject*, void*, boost::type<T const*>) const;
};
//
// implementations
//
template <class T>
void* class_unwrapper<T>::can_convert(PyObject* p) const
{
return object::find_holder<T>(p);
}
template <class T>
T& class_unwrapper<T>::convert(PyObject*, void* holder_, boost::type<T&>) const
{
return *static_cast<object::holder<T>*>(holder_)->target();
}
template <class T>
T const& class_unwrapper<T>::convert(PyObject*, void* holder_, boost::type<T const&>) const
{
return *static_cast<object::holder<T>*>(holder_)->target();
}
template <class T>
T* class_unwrapper<T>::convert(PyObject*, void* holder_, boost::type<T*>) const
{
return static_cast<object::holder<T>*>(holder_)->target();
}
template <class T>
T const* class_unwrapper<T>::convert(PyObject*, void* holder_, boost::type<T const*>) const
{
return static_cast<object::holder<T>*>(holder_)->target();
}
}}} // namespace boost::python::converter
#endif // CLASS_DWA20011215_HPP