source: NonGTP/Boost/boost/python/object/make_holder.hpp @ 857

Revision 857, 3.0 KB checked in by igarcia, 19 years ago (diff)
Line 
1#if !defined(BOOST_PP_IS_ITERATING)
2
3// Copyright David Abrahams 2001.
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 MAKE_HOLDER_DWA20011215_HPP
9#  define MAKE_HOLDER_DWA20011215_HPP
10
11#  include <boost/python/detail/prefix.hpp>
12
13#  include <boost/python/object/instance.hpp>
14
15#  include <boost/python/object/forward.hpp>
16#  include <boost/python/detail/preprocessor.hpp>
17
18#  include <boost/mpl/next.hpp>
19#  include <boost/mpl/begin_end.hpp>
20#  include <boost/mpl/deref.hpp>
21
22#  include <boost/preprocessor/iterate.hpp>
23#  include <boost/preprocessor/iteration/local.hpp>
24#  include <boost/preprocessor/repeat.hpp>
25#  include <boost/preprocessor/debug/line.hpp>
26#  include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp>
27
28#  include <cstddef>
29
30namespace boost { namespace python { namespace objects {
31
32template <int nargs> struct make_holder;
33
34#  define BOOST_PYTHON_DO_FORWARD_ARG(z, index, _) , f##index(a##index)
35
36// specializations...
37#  define BOOST_PP_ITERATION_PARAMS_1 (3, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/make_holder.hpp>))
38#  include BOOST_PP_ITERATE()
39
40#  undef BOOST_PYTHON_DO_FORWARD_ARG
41
42}}} // namespace boost::python::objects
43
44# endif // MAKE_HOLDER_DWA20011215_HPP
45
46#elif BOOST_PP_ITERATION_DEPTH() == 1
47# if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
48        && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
49#  line BOOST_PP_LINE(__LINE__, make_holder.hpp)
50# endif
51
52# define N BOOST_PP_ITERATION()
53
54template <>
55struct make_holder<N>
56{
57    template <class Holder, class ArgList>
58    struct apply
59    {
60# if N
61        // Unrolled iteration through each argument type in ArgList,
62        // choosing the type that will be forwarded on to the holder's
63        // templated constructor.
64        typedef typename mpl::begin<ArgList>::type iter0;
65       
66#  define BOOST_PP_LOCAL_MACRO(n)               \
67    typedef typename mpl::deref<iter##n>::type t##n;        \
68    typedef typename forward<t##n>::type f##n;  \
69    typedef typename mpl::next<iter##n>::type   \
70        BOOST_PP_CAT(iter,BOOST_PP_INC(n)); // Next iterator type
71       
72#  define BOOST_PP_LOCAL_LIMITS (0, N-1)
73#  include BOOST_PP_LOCAL_ITERATE()
74# endif
75       
76        static void execute(
77            PyObject* p
78            BOOST_PP_ENUM_TRAILING_BINARY_PARAMS_Z(1, N, t, a))
79        {
80            typedef instance<Holder> instance_t;
81           
82            void* memory = Holder::allocate(p, offsetof(instance_t, storage), sizeof(Holder));
83            try {
84                (new (memory) Holder(
85                    p BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_DO_FORWARD_ARG, nil)))->install(p);
86            }
87            catch(...) {
88                Holder::deallocate(p, memory);
89                throw;
90            }
91        }
92    };
93};
94
95# undef N
96
97#endif
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