Imported Upstream version 1.57.0
[platform/upstream/boost.git] / boost / lexical_cast / detail / is_character.hpp
1 // Copyright Kevlin Henney, 2000-2005.
2 // Copyright Alexander Nasonov, 2006-2010.
3 // Copyright Antony Polukhin, 2011-2014.
4 //
5 // Distributed under the Boost Software License, Version 1.0. (See
6 // accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt)
8 //
9 // what:  lexical_cast custom keyword cast
10 // who:   contributed by Kevlin Henney,
11 //        enhanced with contributions from Terje Slettebo,
12 //        with additional fixes and suggestions from Gennaro Prota,
13 //        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
14 //        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
15 //        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
16 // when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
17
18 #ifndef BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
19 #define BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
20
21 #include <boost/config.hpp>
22 #ifdef BOOST_HAS_PRAGMA_ONCE
23 #   pragma once
24 #endif
25
26 #include <boost/type_traits/is_same.hpp>
27
28 namespace boost {
29
30     namespace detail // is_character<...>
31     {
32         // returns true, if T is one of the character types
33         template < typename T >
34         struct is_character
35         {
36             typedef boost::type_traits::ice_or<
37                     boost::is_same< T, char >::value,
38                     #if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING)
39                         boost::is_same< T, wchar_t >::value,
40                     #endif
41                     #ifndef BOOST_NO_CXX11_CHAR16_T
42                         boost::is_same< T, char16_t >::value,
43                     #endif
44                     #ifndef BOOST_NO_CXX11_CHAR32_T
45                         boost::is_same< T, char32_t >::value,
46                     #endif
47                     boost::is_same< T, unsigned char >::value,
48                     boost::is_same< T, signed char >::value
49             > result_type;
50
51             BOOST_STATIC_CONSTANT(bool, value = (result_type::value) );
52         };
53     }
54 }
55
56 #endif // BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
57