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- // Copyright Kevlin Henney, 2000-2005.
- // Copyright Alexander Nasonov, 2006-2010.
- // Copyright Antony Polukhin, 2011-2021.
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // what: lexical_cast custom keyword cast
- // who: contributed by Kevlin Henney,
- // enhanced with contributions from Terje Slettebo,
- // with additional fixes and suggestions from Gennaro Prota,
- // Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
- // Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
- // Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
- // when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
- #ifndef BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
- #define BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
- #include <boost/config.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- # pragma once
- #endif
- #include <boost/type_traits/integral_constant.hpp>
- #include <boost/type_traits/is_same.hpp>
- namespace boost {
- namespace detail // is_character<...>
- {
- // returns true, if T is one of the character types
- template < typename T >
- struct is_character
- {
- typedef BOOST_DEDUCED_TYPENAME boost::integral_constant<
- bool,
- boost::is_same< T, char >::value ||
- #if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING)
- boost::is_same< T, wchar_t >::value ||
- #endif
- #ifndef BOOST_NO_CXX11_CHAR16_T
- boost::is_same< T, char16_t >::value ||
- #endif
- #ifndef BOOST_NO_CXX11_CHAR32_T
- boost::is_same< T, char32_t >::value ||
- #endif
- boost::is_same< T, unsigned char >::value ||
- boost::is_same< T, signed char >::value
- > type;
- BOOST_STATIC_CONSTANT(bool, value = (type::value) );
- };
- }
- }
- #endif // BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
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