// 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 |