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1 | // Copyright (c) 2001-2011 Hartmut Kaiser |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #if !defined(BOOST_SPIRIT_ITERATOR_MULTI_PASS_WRAPPER_JUL_12_2009_0914PM) | |
7 | #define BOOST_SPIRIT_ITERATOR_MULTI_PASS_WRAPPER_JUL_12_2009_0914PM | |
8 | ||
9 | #if defined(_MSC_VER) | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/mpl/bool.hpp> | |
14 | #include <boost/spirit/home/support/detail/scoped_enum_emulation.hpp> | |
15 | ||
16 | namespace boost { namespace spirit { namespace traits | |
17 | { | |
18 | // declare special functions allowing to integrate any multi_pass iterator | |
19 | // with expectation points | |
20 | ||
21 | // normal iterators require no special handling | |
22 | BOOST_SCOPED_ENUM_START(clear_mode) | |
23 | { | |
24 | clear_if_enabled, | |
25 | clear_always | |
26 | }; | |
27 | BOOST_SCOPED_ENUM_END | |
28 | ||
29 | template <typename Iterator> | |
30 | void clear_queue(Iterator& | |
31 | , BOOST_SCOPED_ENUM(clear_mode) /*mode*/ = clear_mode::clear_if_enabled) | |
32 | {} | |
33 | ||
34 | template <typename Iterator> | |
35 | void inhibit_clear_queue(Iterator&, bool) | |
36 | {} | |
37 | ||
38 | template <typename Iterator> | |
39 | bool inhibit_clear_queue(Iterator&) | |
40 | { | |
41 | return false; | |
42 | } | |
43 | ||
44 | // Helper template to recognize a multi_pass iterator. This specialization | |
45 | // will be instantiated for any non-multi_pass iterator. | |
46 | template <typename Iterator> | |
47 | struct is_multi_pass : mpl::false_ {}; | |
48 | ||
49 | }}} | |
50 | ||
51 | #endif | |
52 |