1 // Copyright Kevlin Henney, 2000-2005.
2 // Copyright Alexander Nasonov, 2006-2010.
3 // Copyright Antony Polukhin, 2011-2021.
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_WIDEST_CHAR_HPP
19 #define BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
20 
21 #include <boost/config.hpp>
22 #ifdef BOOST_HAS_PRAGMA_ONCE
23 #   pragma once
24 #endif
25 
26 
27 #include <boost/type_traits/conditional.hpp>
28 
29 namespace boost { namespace detail {
30 
31     template <typename TargetChar, typename SourceChar>
32     struct widest_char {
33         typedef BOOST_DEDUCED_TYPENAME boost::conditional<
34             (sizeof(TargetChar) > sizeof(SourceChar))
35             , TargetChar
36             , SourceChar
37         >::type type;
38     };
39 
40 }} // namespace boost::detail
41 
42 #endif // BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
43 
44