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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_KARMA_AS_STRING_DEC_18_0644PM) | |
7 | #define BOOST_SPIRIT_KARMA_AS_STRING_DEC_18_0644PM | |
8 | ||
9 | #if defined(_MSC_VER) | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/spirit/home/support/unused.hpp> | |
14 | #include <boost/spirit/home/support/attributes_fwd.hpp> | |
15 | ||
16 | /////////////////////////////////////////////////////////////////////////////// | |
17 | namespace boost { namespace spirit { namespace traits | |
18 | { | |
19 | /////////////////////////////////////////////////////////////////////////// | |
20 | // This file contains the attribute to string conversion utility. The | |
21 | // utility provided also accept spirit's unused_type; all no-ops. Compiler | |
22 | // optimization will easily strip these away. | |
23 | /////////////////////////////////////////////////////////////////////////// | |
24 | ||
25 | /////////////////////////////////////////////////////////////////////////// | |
26 | template <typename T, typename Attribute> | |
27 | inline typename spirit::result_of::attribute_as<T, Attribute>::type | |
28 | as(Attribute const& attr) | |
29 | { | |
30 | return attribute_as<T, Attribute>::call(attr); | |
31 | } | |
32 | ||
33 | template <typename T> | |
34 | inline unused_type as(unused_type) | |
35 | { | |
36 | return unused; | |
37 | } | |
38 | ||
39 | /////////////////////////////////////////////////////////////////////////// | |
40 | template <typename T, typename Attribute> | |
41 | inline bool valid_as(Attribute const& attr) | |
42 | { | |
43 | return attribute_as<T, Attribute>::is_valid(attr); | |
44 | } | |
45 | ||
46 | template <typename T> | |
47 | inline bool valid_as(unused_type) | |
48 | { | |
49 | return true; | |
50 | } | |
51 | }}} | |
52 | ||
53 | /////////////////////////////////////////////////////////////////////////////// | |
54 | namespace boost { namespace spirit { namespace result_of | |
55 | { | |
56 | template <typename T, typename Attribute> | |
57 | struct attribute_as | |
58 | : traits::attribute_as<T, Attribute> | |
59 | {}; | |
60 | ||
61 | template <typename T> | |
62 | struct attribute_as<T, unused_type> | |
63 | { | |
64 | typedef unused_type type; | |
65 | }; | |
66 | ||
67 | template <typename T> | |
68 | struct attribute_as<T, unused_type const> | |
69 | { | |
70 | typedef unused_type type; | |
71 | }; | |
72 | }}} | |
73 | ||
74 | #endif |