1
2#if !defined(BOOST_PP_IS_ITERATING)
3
4///// header body
5
6#ifndef BOOST_MPL_UNPACK_ARGS_HPP_INCLUDED
7#define BOOST_MPL_UNPACK_ARGS_HPP_INCLUDED
8
9// Copyright Aleksey Gurtovoy 2002-2004
10//
11// Distributed under the Boost Software License, Version 1.0.
12// (See accompanying file LICENSE_1_0.txt or copy at
13// http://www.boost.org/LICENSE_1_0.txt)
14//
15// See http://www.boost.org/libs/mpl for documentation.
16
17// $Id$
18// $Date$
19// $Revision$
20
21#if !defined(BOOST_MPL_PREPROCESSING_MODE)
22# include <boost/mpl/apply.hpp>
23# include <boost/mpl/at.hpp>
24# include <boost/mpl/size.hpp>
25# include <boost/mpl/aux_/nttp_decl.hpp>
26# include <boost/mpl/aux_/lambda_spec.hpp>
27#endif
28
29#include <boost/mpl/aux_/config/use_preprocessed.hpp>
30
31#if !defined(BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS) \
32 && !defined(BOOST_MPL_PREPROCESSING_MODE)
33
34# define BOOST_MPL_PREPROCESSED_HEADER unpack_args.hpp
35# include <boost/mpl/aux_/include_preprocessed.hpp>
36
37#else
38
39# include <boost/mpl/limits/arity.hpp>
40# include <boost/mpl/aux_/preprocessor/repeat.hpp>
41# include <boost/mpl/aux_/config/ctps.hpp>
42# include <boost/mpl/aux_/config/forwarding.hpp>
43# include <boost/preprocessor/iterate.hpp>
44# include <boost/preprocessor/cat.hpp>
45
46
47namespace boost { namespace mpl {
48
49// local macros, #undef-ined at the end of the header
50
51# define AUX778076_UNPACK(unused, i, Args) \
52 , typename at_c<Args,i>::type \
53 /**/
54
55# define AUX778076_UNPACKED_ARGS(n, Args) \
56 BOOST_MPL_PP_REPEAT(n, AUX778076_UNPACK, Args) \
57 /**/
58
59namespace aux {
60
61#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
62template< int size, typename F, typename Args >
63struct unpack_args_impl;
64#else
65template< BOOST_MPL_AUX_NTTP_DECL(int, size) > struct unpack_args_impl
66{
67 template< typename F, typename Args > struct apply;
68};
69#endif
70
71#define BOOST_PP_ITERATION_PARAMS_1 \
72 (3,(0, BOOST_MPL_LIMIT_METAFUNCTION_ARITY, <boost/mpl/unpack_args.hpp>))
73#include BOOST_PP_ITERATE()
74
75}
76
77template<
78 typename F
79 >
80struct unpack_args
81{
82 template< typename Args > struct apply
83#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
84# if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
85 : aux::unpack_args_impl< size<Args>::value,F,Args >
86# else
87 : aux::unpack_args_impl< size<Args>::value >
88 ::template apply< F,Args >
89# endif
90 {
91#else // BOOST_MPL_CFG_NO_NESTED_FORWARDING
92 {
93 typedef typename aux::unpack_args_impl<
94 size<Args>::value
95 , F
96 , Args
97 >::type type;
98#endif
99 };
100};
101
102BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(1, unpack_args)
103
104# undef AUX778076_UNPACK
105# undef AUX778076_UNPACKED_ARGS
106
107}}
108
109#endif // BOOST_MPL_CFG_USE_PREPROCESSED_HEADERS
110#endif // BOOST_MPL_UNPACK_ARGS_HPP_INCLUDED
111
112///// iteration, depth == 1
113
114// For gcc 4.4 compatability, we must include the
115// BOOST_PP_ITERATION_DEPTH test inside an #else clause.
116#else // BOOST_PP_IS_ITERATING
117#if BOOST_PP_ITERATION_DEPTH() == 1
118
119# define i_ BOOST_PP_FRAME_ITERATION(1)
120
121#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
122
123template< typename F, typename Args >
124struct unpack_args_impl<i_,F,Args>
125 : BOOST_PP_CAT(apply,i_)<
126 F
127 AUX778076_UNPACKED_ARGS(i_, Args)
128 >
129{
130};
131
132#else
133
134template<> struct unpack_args_impl<i_>
135{
136 template< typename F, typename Args > struct apply
137 : BOOST_PP_CAT(apply,i_)<
138 F
139 AUX778076_UNPACKED_ARGS(i_, Args)
140 >
141 {
142 };
143};
144
145#endif
146
147# undef i_
148
149#endif // BOOST_PP_ITERATION_DEPTH()
150#endif // BOOST_PP_IS_ITERATING
151

source code of boost/boost/mpl/unpack_args.hpp