Chris@16: // Copyright David Abrahams 2002.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: #ifndef IMPLICIT_DWA2002326_HPP
Chris@16: # define IMPLICIT_DWA2002326_HPP
Chris@16: 
Chris@16: # include <boost/python/converter/rvalue_from_python_data.hpp>
Chris@16: # include <boost/python/converter/registrations.hpp>
Chris@16: # include <boost/python/converter/registered.hpp>
Chris@16: 
Chris@16: # include <boost/python/extract.hpp>
Chris@16: 
Chris@16: namespace boost { namespace python { namespace converter { 
Chris@16: 
Chris@16: template <class Source, class Target>
Chris@16: struct implicit
Chris@16: {
Chris@16:     static void* convertible(PyObject* obj)
Chris@16:     {
Chris@16:         // Find a converter which can produce a Source instance from
Chris@16:         // obj. The user has told us that Source can be converted to
Chris@16:         // Target, and instantiating construct() below, ensures that
Chris@16:         // at compile-time.
Chris@16:         return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters)
Chris@16:             ? obj : 0;
Chris@16:     }
Chris@16:       
Chris@16:     static void construct(PyObject* obj, rvalue_from_python_stage1_data* data)
Chris@16:     {
Chris@16:         void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes;
Chris@16: 
Chris@16:         arg_from_python<Source> get_source(obj);
Chris@16:         bool convertible = get_source.convertible();
Chris@16:         BOOST_VERIFY(convertible);
Chris@16:         
Chris@16:         new (storage) Target(get_source());
Chris@16:         
Chris@16:         // record successful construction
Chris@16:         data->convertible = storage;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: }}} // namespace boost::python::converter
Chris@16: 
Chris@16: #endif // IMPLICIT_DWA2002326_HPP