// 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