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1 | #ifndef BOOST_METAPARSE_V1_IMPL_EMPTY_STRING_HPP |
2 | #define BOOST_METAPARSE_V1_IMPL_EMPTY_STRING_HPP | |
3 | ||
4 | // Copyright Abel Sinkovics (abel@sinkovics.hu) 2013. | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | #include <boost/metaparse/config.hpp> | |
10 | ||
11 | namespace boost | |
12 | { | |
13 | namespace metaparse | |
14 | { | |
15 | namespace v1 | |
16 | { | |
17 | namespace impl | |
18 | { | |
19 | template <class Ignore = int> | |
20 | struct empty_string | |
21 | { | |
22 | typedef empty_string type; | |
23 | ||
24 | #ifdef BOOST_NO_CONSTEXPR_C_STR | |
25 | static const char value[1]; | |
26 | #else | |
27 | static constexpr char value[1] = {0}; | |
28 | #endif | |
29 | }; | |
30 | ||
31 | #ifdef BOOST_NO_CONSTEXPR_C_STR | |
32 | template <class Ignore> | |
33 | const char empty_string<Ignore>::value[1] = {0}; | |
34 | #else | |
35 | template <class Ignore> | |
36 | constexpr char empty_string<Ignore>::value[1]; | |
37 | #endif | |
38 | } | |
39 | } | |
40 | } | |
41 | } | |
42 | ||
43 | #endif | |
44 |