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1 | /*============================================================================= |
2 | Copyright (c) 1999-2003 Jaakko Jarvi | |
3 | Copyright (c) 1999-2003 Jeremiah Willcock | |
4 | Copyright (c) 2001-2011 Joel de Guzman | |
5 | ||
6 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
7 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
8 | ==============================================================================*/ | |
9 | #if !defined(FUSION_IN_05052005_0121) | |
10 | #define FUSION_IN_05052005_0121 | |
11 | ||
12 | #include <boost/fusion/support/config.hpp> | |
13 | #include <istream> | |
14 | #include <boost/fusion/sequence/io/detail/manip.hpp> | |
15 | ||
16 | #include <boost/mpl/bool.hpp> | |
17 | #include <boost/fusion/sequence/intrinsic/begin.hpp> | |
18 | #include <boost/fusion/sequence/intrinsic/end.hpp> | |
19 | #include <boost/fusion/iterator/deref.hpp> | |
20 | #include <boost/fusion/iterator/next.hpp> | |
21 | #include <boost/fusion/iterator/equal_to.hpp> | |
22 | ||
23 | namespace boost { namespace fusion { namespace detail | |
24 | { | |
25 | template <typename Tag> | |
26 | struct delimiter_in | |
27 | { | |
28 | // read a delimiter | |
29 | template <typename IS> | |
30 | static void | |
31 | read(IS& is, char const* delim, mpl::false_ = mpl::false_()) | |
32 | { | |
33 | detail::string_ios_manip<Tag, IS> manip(is); | |
34 | manip.read(delim); | |
35 | } | |
36 | ||
37 | template <typename IS> | |
38 | static void | |
39 | read(IS&, char const*, mpl::true_) | |
40 | { | |
41 | } | |
42 | }; | |
43 | ||
44 | struct read_sequence_loop | |
45 | { | |
46 | template <typename IS, typename First, typename Last> | |
47 | static void | |
48 | call(IS&, First const&, Last const&, mpl::true_) | |
49 | { | |
50 | } | |
51 | ||
52 | template <typename IS, typename First, typename Last> | |
53 | static void | |
54 | call(IS& is, First const& first, Last const& last, mpl::false_) | |
55 | { | |
56 | result_of::equal_to< | |
57 | typename result_of::next<First>::type | |
58 | , Last | |
59 | > | |
60 | is_last; | |
61 | ||
62 | is >> *first; | |
63 | delimiter_in<tuple_delimiter_tag>::read(is, " ", is_last); | |
64 | call(is, fusion::next(first), last, is_last); | |
65 | } | |
66 | ||
67 | template <typename IS, typename First, typename Last> | |
68 | static void | |
69 | call(IS& is, First const& first, Last const& last) | |
70 | { | |
71 | result_of::equal_to<First, Last> eq; | |
72 | call(is, first, last, eq); | |
73 | } | |
74 | }; | |
75 | ||
76 | template <typename IS, typename Sequence> | |
77 | inline void | |
78 | read_sequence(IS& is, Sequence& seq) | |
79 | { | |
80 | delimiter_in<tuple_open_tag>::read(is, "("); | |
81 | read_sequence_loop::call(is, fusion::begin(seq), fusion::end(seq)); | |
82 | delimiter_in<tuple_close_tag>::read(is, ")"); | |
83 | } | |
84 | }}} | |
85 | ||
86 | #endif |