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1 // Copyright Kevlin Henney, 2000-2005.
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2 // Copyright Alexander Nasonov, 2006-2010.
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3 // Copyright Antony Polukhin, 2011-2014.
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4 //
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5 // Distributed under the Boost Software License, Version 1.0. (See
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6 // accompanying file LICENSE_1_0.txt or copy at
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7 // http://www.boost.org/LICENSE_1_0.txt)
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8 //
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9 // what: lexical_cast custom keyword cast
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10 // who: contributed by Kevlin Henney,
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11 // enhanced with contributions from Terje Slettebo,
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12 // with additional fixes and suggestions from Gennaro Prota,
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13 // Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
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14 // Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
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15 // Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
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16 // when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
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17
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18 #ifndef BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
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19 #define BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
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20
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21 #include <boost/config.hpp>
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22 #ifdef BOOST_HAS_PRAGMA_ONCE
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23 # pragma once
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24 #endif
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25
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26 namespace boost { namespace detail {
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27
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28 template <typename TargetChar, typename SourceChar>
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29 struct widest_char {
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30 typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
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31 (sizeof(TargetChar) > sizeof(SourceChar))
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32 , TargetChar
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33 , SourceChar
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34 >::type type;
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35 };
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36
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37 }} // namespace boost::detail
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38
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39 #endif // BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
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40
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