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1 | |
2 | #ifndef BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED | |
3 | #define BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED | |
4 | ||
5 | // Copyright Aleksey Gurtovoy 2000-2004 | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. | |
8 | // (See accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | // | |
11 | // See http://www.boost.org/libs/mpl for documentation. | |
12 | ||
13 | // $Id$ | |
14 | // $Date$ | |
15 | // $Revision$ | |
16 | ||
17 | #include <boost/mpl/O1_size_fwd.hpp> | |
18 | #include <boost/mpl/long.hpp> | |
19 | #include <boost/mpl/if.hpp> | |
20 | #include <boost/mpl/aux_/has_size.hpp> | |
21 | #include <boost/mpl/aux_/config/forwarding.hpp> | |
22 | #include <boost/mpl/aux_/config/static_constant.hpp> | |
23 | #include <boost/mpl/aux_/config/msvc.hpp> | |
24 | #include <boost/mpl/aux_/config/workaround.hpp> | |
25 | ||
26 | namespace boost { namespace mpl { | |
27 | ||
28 | // default implementation - returns 'Sequence::size' if sequence has a 'size' | |
29 | // member, and -1 otherwise; conrete sequences might override it by | |
30 | // specializing either the 'O1_size_impl' or the primary 'O1_size' template | |
31 | ||
32 | # if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) \ | |
33 | && !BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3003)) | |
34 | ||
35 | namespace aux { | |
36 | template< typename Sequence > struct O1_size_impl | |
37 | : Sequence::size | |
38 | { | |
39 | }; | |
40 | } | |
41 | ||
42 | template< typename Tag > | |
43 | struct O1_size_impl | |
44 | { | |
45 | template< typename Sequence > struct apply | |
46 | #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) | |
47 | : if_< | |
48 | aux::has_size<Sequence> | |
49 | , aux::O1_size_impl<Sequence> | |
50 | , long_<-1> | |
51 | >::type | |
52 | { | |
53 | #else | |
54 | { | |
55 | typedef typename if_< | |
56 | aux::has_size<Sequence> | |
57 | , aux::O1_size_impl<Sequence> | |
58 | , long_<-1> | |
59 | >::type type; | |
60 | ||
61 | BOOST_STATIC_CONSTANT(long, value = | |
62 | (if_< | |
63 | aux::has_size<Sequence> | |
64 | , aux::O1_size_impl<Sequence> | |
65 | , long_<-1> | |
66 | >::type::value) | |
67 | ); | |
68 | #endif | |
69 | }; | |
70 | }; | |
71 | ||
72 | # else // BOOST_MSVC | |
73 | ||
74 | template< typename Tag > | |
75 | struct O1_size_impl | |
76 | { | |
77 | template< typename Sequence > struct apply | |
78 | : long_<-1> | |
79 | { | |
80 | }; | |
81 | }; | |
82 | ||
83 | # endif | |
84 | ||
85 | }} | |
86 | ||
87 | #endif // BOOST_MPL_O1_SIZE_IMPL_HPP_INCLUDED |