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// 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