sl@0: // Copyright David Abrahams 2002.
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: #ifndef IMPLICIT_DWA2002326_HPP
sl@0: # define IMPLICIT_DWA2002326_HPP
sl@0: 
sl@0: # include <boost/python/converter/rvalue_from_python_data.hpp>
sl@0: # include <boost/python/converter/registrations.hpp>
sl@0: # include <boost/python/converter/registered.hpp>
sl@0: 
sl@0: # include <boost/python/extract.hpp>
sl@0: 
sl@0: namespace boost { namespace python { namespace converter { 
sl@0: 
sl@0: template <class Source, class Target>
sl@0: struct implicit
sl@0: {
sl@0:     static void* convertible(PyObject* obj)
sl@0:     {
sl@0:         // Find a converter which can produce a Source instance from
sl@0:         // obj. The user has told us that Source can be converted to
sl@0:         // Target, and instantiating construct() below, ensures that
sl@0:         // at compile-time.
sl@0:         return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters)
sl@0:             ? obj : 0;
sl@0:     }
sl@0:       
sl@0:     static void construct(PyObject* obj, rvalue_from_python_stage1_data* data)
sl@0:     {
sl@0:         void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes;
sl@0: 
sl@0:         arg_from_python<Source> get_source(obj);
sl@0:         bool convertible = get_source.convertible();
sl@0:         BOOST_ASSERT(convertible);
sl@0:         
sl@0:         new (storage) Target(get_source());
sl@0:         
sl@0:         // record successful construction
sl@0:         data->convertible = storage;
sl@0:     }
sl@0: };
sl@0: 
sl@0: }}} // namespace boost::python::converter
sl@0: 
sl@0: #endif // IMPLICIT_DWA2002326_HPP