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1 | /*============================================================================= |
2 | Copyright (c) 2001-2014 Joel de Guzman | |
3 | Copyright (c) 2014 Agustin Berge | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ==============================================================================*/ | |
8 | #if !defined(BOOST_SPIRIT_X3_IS_PARSER_MAY_20_2013_0235PM) | |
9 | #define BOOST_SPIRIT_X3_IS_PARSER_MAY_20_2013_0235PM | |
10 | ||
11 | #include <boost/mpl/bool.hpp> | |
12 | #include <boost/spirit/home/x3/core/parser.hpp> | |
13 | #include <boost/spirit/home/x3/support/utility/sfinae.hpp> | |
14 | ||
15 | namespace boost { namespace spirit { namespace x3 { namespace traits | |
16 | { | |
17 | /////////////////////////////////////////////////////////////////////////// | |
18 | // is_parser<T>: metafunction that evaluates to mpl::true_ if a type T | |
19 | // can be used as a parser, mpl::false_ otherwise | |
20 | /////////////////////////////////////////////////////////////////////////// | |
21 | template <typename T, typename Enable = void> | |
22 | struct is_parser | |
23 | : mpl::false_ | |
24 | {}; | |
25 | ||
26 | template <typename T> | |
27 | struct is_parser<T, typename disable_if_substitution_failure< | |
28 | typename extension::as_parser<T>::type>::type> | |
29 | : mpl::true_ | |
30 | {}; | |
31 | }}}} | |
32 | ||
33 | #endif |