source: NonGTP/Boost/boost/python/call.hpp @ 857

Revision 857, 2.6 KB checked in by igarcia, 19 years ago (diff)
Line 
1#if !defined(BOOST_PP_IS_ITERATING)
2
3// Copyright David Abrahams 2002.
4// Distributed under the Boost Software License, Version 1.0. (See
5// accompanying file LICENSE_1_0.txt or copy at
6// http://www.boost.org/LICENSE_1_0.txt)
7
8# ifndef CALL_DWA2002411_HPP
9#  define CALL_DWA2002411_HPP
10
11# include <boost/python/detail/prefix.hpp>
12
13#  include <boost/type.hpp>
14
15#  include <boost/python/converter/arg_to_python.hpp>
16#  include <boost/python/converter/return_from_python.hpp>
17#  include <boost/python/detail/preprocessor.hpp>
18#  include <boost/python/detail/void_return.hpp>
19
20#  include <boost/preprocessor/comma_if.hpp>
21#  include <boost/preprocessor/iterate.hpp>
22#  include <boost/preprocessor/repeat.hpp>
23#  include <boost/preprocessor/debug/line.hpp>
24#  include <boost/preprocessor/repetition/enum_trailing_params.hpp>
25#  include <boost/preprocessor/repetition/enum_binary_params.hpp>
26
27namespace boost { namespace python {
28
29# define BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET(z, n, _) \
30    , converter::arg_to_python<A##n>(a##n).get()
31
32#  define BOOST_PP_ITERATION_PARAMS_1 (3, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/call.hpp>))
33#  include BOOST_PP_ITERATE()
34
35#  undef BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET
36
37}} // namespace boost::python
38
39# endif // CALL_DWA2002411_HPP
40
41#elif BOOST_PP_ITERATION_DEPTH() == 1
42# if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
43        && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
44#  line BOOST_PP_LINE(__LINE__, call.hpp)
45# endif
46
47# define N BOOST_PP_ITERATION()
48
49template <
50    class R
51    BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class A)
52    >
53typename detail::returnable<R>::type
54call(PyObject* callable
55    BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, const& a)
56    , boost::type<R>* = 0
57    )
58{
59    PyObject* const result =
60        PyEval_CallFunction(
61            callable
62            , const_cast<char*>("(" BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FIXED, "O") ")")
63            BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET, nil)
64            );
65   
66    // This conversion *must not* be done in the same expression as
67    // the call, because, in the special case where the result is a
68    // reference a Python object which was created by converting a C++
69    // argument for passing to PyEval_CallFunction, its reference
70    // count will be 2 until the end of the full expression containing
71    // the conversion, and that interferes with dangling
72    // pointer/reference detection.
73    converter::return_from_python<R> converter;
74    return converter(result);
75}
76
77# undef N
78
79#endif
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