ceph/src/boost/libs/python/include/boost/python/call_method.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 # ifndef CALL_METHOD_DWA2002411_HPP
   8 #  define CALL_METHOD_DWA2002411_HPP
   9
  10 # include <boost/python/detail/prefix.hpp>
  11
  12 #  include <boost/type.hpp>
  13
  14 #  include <boost/python/converter/arg_to_python.hpp>
  15 #  include <boost/python/converter/return_from_python.hpp>
  16 #  include <boost/python/detail/preprocessor.hpp>
  17 #  include <boost/python/detail/void_return.hpp>
  18
  19 #  include <boost/preprocessor/comma_if.hpp>
  20 #  include <boost/preprocessor/iterate.hpp>
  21 #  include <boost/preprocessor/repeat.hpp>
  22 #  include <boost/preprocessor/debug/line.hpp>
  23 #  include <boost/preprocessor/repetition/enum_trailing_params.hpp>
  24 #  include <boost/preprocessor/repetition/enum_binary_params.hpp>
  25
  26 namespace boost { namespace python {
  27
  28 # define BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET(z, n, _) \
  29     , converter::arg_to_python<A##n>(a##n).get()
  30
  31 # define BOOST_PP_ITERATION_PARAMS_1 (3, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/call_method.hpp>))
  32 # include BOOST_PP_ITERATE()
  33
  34 # undef BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET
  35
  36 }} // namespace boost::python
  37
  38 # endif // CALL_METHOD_DWA2002411_HPP
  39
  40 // For gcc 4.4 compatability, we must include the
  41 // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
  42 #else // BOOST_PP_IS_ITERATING
  43 #if BOOST_PP_ITERATION_DEPTH() == 1
  44 # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
  45         && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
  46 #  line BOOST_PP_LINE(__LINE__, call_method.hpp)
  47 # endif
  48
  49 # define N BOOST_PP_ITERATION()
  50
  51 template <
  52     class R
  53     BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class A)
  54     >
  55 typename detail::returnable<R>::type
  56 call_method(PyObject* self, char const* name
  57     BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, const& a)
  58     , boost::type<R>* = 0
  59     )
  60 {
  61     PyObject* const result =
  62         PyEval_CallMethod(
  63             self
  64             , const_cast<char*>(name)
  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 // BOOST_PP_IS_ITERATING