| 1 | // Copyright Kevlin Henney, 2000-2005. |
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| 2 | // Copyright Alexander Nasonov, 2006-2010. |
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| 3 | // Copyright Antony Polukhin, 2011-2020. |
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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 | |
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| 27 | #include <boost/type_traits/conditional.hpp> |
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| 28 | |
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| 29 | namespace boost { namespace detail { |
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| 30 | |
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| 31 | template <typename TargetChar, typename SourceChar> |
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| 32 | struct widest_char { |
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| 33 | typedef BOOST_DEDUCED_TYPENAME boost::conditional< |
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| 34 | (sizeof(TargetChar) > sizeof(SourceChar)) |
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| 35 | , TargetChar |
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| 36 | , SourceChar |
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| 37 | >::type type; |
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| 38 | }; |
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| 39 | |
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| 40 | }} // namespace boost::detail |
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| 41 | |
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| 42 | #endif // BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP |
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| 43 | |
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| 44 | |
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