[29] | 1 | // Copyright David Abrahams 2002. |
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 3 | // accompanying file LICENSE_1_0.txt or copy at |
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| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | #ifndef IMPLICIT_DWA2002326_HPP |
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| 6 | # define IMPLICIT_DWA2002326_HPP |
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| 7 | |
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| 8 | # include <boost/python/converter/rvalue_from_python_data.hpp> |
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| 9 | # include <boost/python/converter/registrations.hpp> |
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| 10 | # include <boost/python/converter/registered.hpp> |
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| 11 | |
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| 12 | # include <boost/python/extract.hpp> |
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| 13 | |
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| 14 | namespace boost { namespace python { namespace converter { |
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| 15 | |
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| 16 | template <class Source, class Target> |
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| 17 | struct implicit |
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| 18 | { |
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| 19 | static void* convertible(PyObject* obj) |
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| 20 | { |
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| 21 | // Find a converter which can produce a Source instance from |
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| 22 | // obj. The user has told us that Source can be converted to |
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| 23 | // Target, and instantiating construct() below, ensures that |
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| 24 | // at compile-time. |
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| 25 | return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters) |
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| 26 | ? obj : 0; |
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| 27 | } |
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| 28 | |
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| 29 | static void construct(PyObject* obj, rvalue_from_python_stage1_data* data) |
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| 30 | { |
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| 31 | void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes; |
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| 32 | |
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| 33 | arg_from_python<Source> get_source(obj); |
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| 34 | bool convertible = get_source.convertible(); |
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| 35 | BOOST_ASSERT(convertible); |
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| 36 | |
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| 37 | new (storage) Target(get_source()); |
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| 38 | |
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| 39 | // record successful construction |
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| 40 | data->convertible = storage; |
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| 41 | } |
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| 42 | }; |
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| 43 | |
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| 44 | }}} // namespace boost::python::converter |
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| 45 | |
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| 46 | #endif // IMPLICIT_DWA2002326_HPP |
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