lexical_cast/detail/widest_char.hpp

0001 // Copyright Kevlin Henney, 2000-2005.
0002 // Copyright Alexander Nasonov, 2006-2010.
0003 // Copyright Antony Polukhin, 2011-2024.
0004 //
0005 // Distributed under the Boost Software License, Version 1.0. (See
0006 // accompanying file LICENSE_1_0.txt or copy at
0007 // http://www.boost.org/LICENSE_1_0.txt)
0008 //
0009 // what:  lexical_cast custom keyword cast
0010 // who:   contributed by Kevlin Henney,
0011 //        enhanced with contributions from Terje Slettebo,
0012 //        with additional fixes and suggestions from Gennaro Prota,
0013 //        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
0014 //        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
0015 //        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
0016 // when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
0017
0018 #ifndef BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
0019 #define BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
0020
0021 #include <boost/config.hpp>
0022 #ifdef BOOST_HAS_PRAGMA_ONCE
0023 #   pragma once
0024 #endif
0025
0026
0027 #include <boost/type_traits/conditional.hpp>
0028
0029 namespace boost { namespace detail {
0030
0031 template <typename TargetChar, typename SourceChar>
0032 using widest_char = boost::conditional<
0033     (sizeof(TargetChar) > sizeof(SourceChar))
0034     , TargetChar
0035     , SourceChar
0036 >;
0037
0038 }} // namespace boost::detail
0039
0040 #endif // BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
0041