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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // mark_begin_matcher.hpp | |
3 | // | |
4 | // Copyright 2008 Eric Niebler. Distributed under the Boost | |
5 | // Software License, Version 1.0. (See accompanying file | |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_BEGIN_MATCHER_HPP_EAN_10_04_2005 | |
9 | #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_BEGIN_MATCHER_HPP_EAN_10_04_2005 | |
10 | ||
11 | // MS compatible compilers support #pragma once | |
12 | #if defined(_MSC_VER) | |
13 | # pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/xpressive/detail/detail_fwd.hpp> | |
17 | #include <boost/xpressive/detail/core/quant_style.hpp> | |
18 | #include <boost/xpressive/detail/core/state.hpp> | |
19 | ||
20 | namespace boost { namespace xpressive { namespace detail | |
21 | { | |
22 | ||
23 | /////////////////////////////////////////////////////////////////////////////// | |
24 | // mark_begin_matcher | |
25 | // | |
26 | struct mark_begin_matcher | |
27 | : quant_style<quant_fixed_width, 0, false> | |
28 | { | |
29 | int mark_number_; // signed because it could be negative | |
30 | ||
31 | mark_begin_matcher(int mark_number) | |
32 | : mark_number_(mark_number) | |
33 | { | |
34 | } | |
35 | ||
36 | template<typename BidiIter, typename Next> | |
37 | bool match(match_state<BidiIter> &state, Next const &next) const | |
38 | { | |
39 | sub_match_impl<BidiIter> &br = state.sub_match(this->mark_number_); | |
40 | ||
41 | BidiIter old_begin = br.begin_; | |
42 | br.begin_ = state.cur_; | |
43 | ||
44 | if(next.match(state)) | |
45 | { | |
46 | return true; | |
47 | } | |
48 | ||
49 | br.begin_ = old_begin; | |
50 | return false; | |
51 | } | |
52 | }; | |
53 | ||
54 | }}} | |
55 | ||
56 | #endif |