]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | // Copyright David Abrahams 2002. |
2 | // Distributed under the Boost Software License, Version 1.0. (See | |
3 | // accompanying file LICENSE_1_0.txt or copy at | |
4 | // http://www.boost.org/LICENSE_1_0.txt) | |
5 | #ifndef IMPLICIT_DWA2002326_HPP | |
6 | # define IMPLICIT_DWA2002326_HPP | |
7 | ||
8 | # include <boost/python/converter/rvalue_from_python_data.hpp> | |
9 | # include <boost/python/converter/registrations.hpp> | |
10 | # include <boost/python/converter/registered.hpp> | |
11 | ||
12 | # include <boost/python/extract.hpp> | |
13 | ||
14 | namespace boost { namespace python { namespace converter { | |
15 | ||
16 | template <class Source, class Target> | |
17 | struct implicit | |
18 | { | |
19 | static void* convertible(PyObject* obj) | |
20 | { | |
21 | // Find a converter which can produce a Source instance from | |
22 | // obj. The user has told us that Source can be converted to | |
23 | // Target, and instantiating construct() below, ensures that | |
24 | // at compile-time. | |
25 | return implicit_rvalue_convertible_from_python(obj, registered<Source>::converters) | |
26 | ? obj : 0; | |
27 | } | |
28 | ||
29 | static void construct(PyObject* obj, rvalue_from_python_stage1_data* data) | |
30 | { | |
31 | void* storage = ((rvalue_from_python_storage<Target>*)data)->storage.bytes; | |
32 | ||
33 | arg_from_python<Source> get_source(obj); | |
34 | bool convertible = get_source.convertible(); | |
35 | BOOST_VERIFY(convertible); | |
36 | ||
37 | new (storage) Target(get_source()); | |
38 | ||
39 | // record successful construction | |
40 | data->convertible = storage; | |
41 | } | |
42 | }; | |
43 | ||
44 | }}} // namespace boost::python::converter | |
45 | ||
46 | #endif // IMPLICIT_DWA2002326_HPP |