// Copyright David Abrahams 2002.

 // Distributed under the Boost Software License, Version 1.0. (See

 // accompanying file LICENSE_1_0.txt or copy at

 // http://www.boost.org/LICENSE_1_0.txt)

 #ifndef IMPLICIT_DWA2002326_HPP

 # define IMPLICIT_DWA2002326_HPP

 # include <boost/python/converter/rvalue_from_python_data.hpp>

 # include <boost/python/converter/registrations.hpp>

 # include <boost/python/converter/registered.hpp>

 # include <boost/python/extract.hpp>

 namespace boost { namespace python { namespace converter { 

 template <class Source, class Target>

 struct implicit

 {

     static void* convertible(PyObject* obj)

     {

         // Find a converter which can produce a Source instance from

         // obj. The user has told us that Source can be converted to

         // Target, and instantiating construct() below, ensures that

         // at compile-time.

         return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters)

             ? obj : 0;

     }

     static void construct(PyObject* obj, rvalue_from_python_stage1_data* data)

     {

         void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes;

         arg_from_python<Source> get_source(obj);

         bool convertible = get_source.convertible();

         BOOST_ASSERT(convertible);

         new (storage) Target(get_source());

         // record successful construction

         data->convertible = storage;

     }

 };

 }}} // namespace boost::python::converter

 #endif // IMPLICIT_DWA2002326_HPP