ceph/src/boost/boost/python/call.hpp

   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
  27 namespace 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 // For gcc 4.4 compatability, we must include the
  42 // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
  43 #else // BOOST_PP_IS_ITERATING
  44 #if BOOST_PP_ITERATION_DEPTH() == 1
  45 # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
  46         && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
  47 #  line BOOST_PP_LINE(__LINE__, call.hpp)
  48 # endif
  49
  50 # define N BOOST_PP_ITERATION()
  51
  52 template <
  53     class R
  54     BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class A)
  55     >
  56 typename detail::returnable<R>::type
  57 call(PyObject* callable
  58     BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, const& a)
  59     , boost::type<R>* = 0
  60     )
  61 {
  62     PyObject* const result =
  63         PyEval_CallFunction(
  64             callable
  65             , const_cast<char*>("(" BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FIXED, "O") ")")
  66             BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET, nil)
  67             );
  68
  69     // This conversion *must not* be done in the same expression as
  70     // the call, because, in the special case where the result is a
  71     // reference a Python object which was created by converting a C++
  72     // argument for passing to PyEval_CallFunction, its reference
  73     // count will be 2 until the end of the full expression containing
  74     // the conversion, and that interferes with dangling
  75     // pointer/reference detection.
  76     converter::return_from_python<R> converter;
  77     return converter(result);
  78 }
  79
  80 # undef N
  81
  82 #endif // BOOST_PP_ITERATION_DEPTH()
  83 #endif