47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
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// Copyright David Abrahams 2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef IMPLICIT_DWA2002326_HPP
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# define IMPLICIT_DWA2002326_HPP
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# include <boost/python/converter/rvalue_from_python_data.hpp>
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# include <boost/python/converter/registrations.hpp>
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# include <boost/python/converter/registered.hpp>
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# include <boost/python/extract.hpp>
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namespace boost { namespace python { namespace converter {
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template <class Source, class Target>
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struct implicit
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{
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static void* convertible(PyObject* obj)
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{
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// Find a converter which can produce a Source instance from
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// obj. The user has told us that Source can be converted to
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// Target, and instantiating construct() below, ensures that
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// at compile-time.
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return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters)
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? obj : 0;
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}
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static void construct(PyObject* obj, rvalue_from_python_stage1_data* data)
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{
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void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes;
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arg_from_python<Source> get_source(obj);
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bool convertible = get_source.convertible();
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BOOST_VERIFY(convertible);
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new (storage) Target(get_source());
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// record successful construction
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data->convertible = storage;
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}
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};
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}}} // namespace boost::python::converter
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#endif // IMPLICIT_DWA2002326_HPP
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