// 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_VERIFY(convertible); new (storage) Target(get_source()); // record successful construction data->convertible = storage; } }; }}} // namespace boost::python::converter #endif // IMPLICIT_DWA2002326_HPP