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1 | /*============================================================================= |
2 | Copyright (c) 2011 Eric Niebler | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | #if !defined(BOOST_FUSION_SEGMENTED_SIZE_08112006_1141) | |
8 | #define BOOST_FUSION_SEGMENTED_SIZE_08112006_1141 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/type_traits/add_const.hpp> | |
12 | #include <boost/type_traits/remove_reference.hpp> | |
13 | #include <boost/mpl/fold.hpp> | |
14 | #include <boost/mpl/plus.hpp> | |
15 | #include <boost/mpl/size_t.hpp> | |
16 | #include <boost/mpl/placeholders.hpp> | |
17 | #include <boost/fusion/sequence/intrinsic_fwd.hpp> | |
18 | #include <boost/fusion/mpl/begin.hpp> | |
19 | #include <boost/fusion/mpl/end.hpp> | |
20 | #include <boost/fusion/support/is_segmented.hpp> | |
21 | ||
22 | namespace boost { namespace fusion { namespace detail | |
23 | { | |
24 | /////////////////////////////////////////////////////////////////////////// | |
25 | // calculates the size of any segmented data structure. | |
26 | template<typename Sequence> | |
27 | struct segmented_size; | |
28 | ||
29 | /////////////////////////////////////////////////////////////////////////// | |
30 | template<typename Sequence, bool IsSegmented = traits::is_segmented<Sequence>::value> | |
31 | struct segmented_size_impl | |
32 | : mpl::fold< | |
33 | typename remove_reference< | |
34 | typename add_const< | |
35 | typename result_of::segments<Sequence>::type | |
36 | >::type | |
37 | >::type | |
38 | , mpl::size_t<0> | |
39 | , mpl::plus<mpl::_1, segmented_size<remove_reference<mpl::_2> > > | |
40 | >::type | |
41 | {}; | |
42 | ||
43 | template<typename Sequence> | |
44 | struct segmented_size_impl<Sequence, false> | |
45 | : result_of::size<Sequence>::type | |
46 | {}; | |
47 | ||
48 | template<typename Sequence> | |
49 | struct segmented_size | |
50 | : segmented_size_impl<Sequence> | |
51 | {}; | |
52 | ||
53 | }}} | |
54 | ||
55 | #endif |