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call.hpp

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#if !defined(BOOST_PP_IS_ITERATING)

// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

# ifndef CALL_DWA2002411_HPP

# define CALL_DWA2002411_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/type.hpp>

# include <boost/python/converter/arg_to_python.hpp>

# include <boost/python/converter/return_from_python.hpp>

# include <boost/python/detail/preprocessor.hpp>

# include <boost/python/detail/void_return.hpp>

# include <boost/preprocessor/comma_if.hpp>

# include <boost/preprocessor/iterate.hpp>

# include <boost/preprocessor/repeat.hpp>

# include <boost/preprocessor/debug/line.hpp>

# include <boost/preprocessor/repetition/enum_trailing_params.hpp>

# include <boost/preprocessor/repetition/enum_binary_params.hpp>

namespace boost { namespace python {

# define BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET(z, n, _) \

, converter::arg_to_python<A##n>(a##n).get()

# define BOOST_PP_ITERATION_PARAMS_1 (3, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/call.hpp>))

# include BOOST_PP_ITERATE()

# undef BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET

}} // namespace boost::python

# endif // CALL_DWA2002411_HPP

// For gcc 4.4 compatability, we must include the

// BOOST_PP_ITERATION_DEPTH test inside an #else clause.

#else // BOOST_PP_IS_ITERATING

#if BOOST_PP_ITERATION_DEPTH() == 1

# if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \

&& BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))

# line BOOST_PP_LINE(__LINE__, call.hpp)

# endif

# define N BOOST_PP_ITERATION()

template <

class R

BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class A)

typename detail::returnable<R>::type

call(PyObject* callable

BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, const& a)

, boost::type<R>* = 0

)

{

PyObject* const result =

PyObject_CallFunction(

callable

, const_cast<char*>("(" BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FIXED, "O") ")")

BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FAST_ARG_TO_PYTHON_GET, nil)

);

// This conversion *must not* be done in the same expression as

// the call, because, in the special case where the result is a

// reference a Python object which was created by converting a C++

// argument for passing to PyObject_CallFunction, its reference

// count will be 2 until the end of the full expression containing

// the conversion, and that interferes with dangling

// pointer/reference detection.

converter::return_from_python<R> converter;

return converter(result);

}

# undef N

#endif // BOOST_PP_ITERATION_DEPTH()

#endif