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+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2014.
+//
+// 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_LCAST_CHAR_CONSTANTS_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_LCAST_CHAR_CONSTANTS_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+namespace boost 
+{
+    namespace detail // '0', '-', '+', 'e', 'E' and '.' constants
+    {
+        template < typename Char >
+        struct lcast_char_constants {
+            // We check in tests assumption that static casted character is
+            // equal to correctly written C++ literal: U'0' == static_cast<char32_t>('0')
+            BOOST_STATIC_CONSTANT(Char, zero  = static_cast<Char>('0'));
+            BOOST_STATIC_CONSTANT(Char, minus = static_cast<Char>('-'));
+            BOOST_STATIC_CONSTANT(Char, plus = static_cast<Char>('+'));
+            BOOST_STATIC_CONSTANT(Char, lowercase_e = static_cast<Char>('e'));
+            BOOST_STATIC_CONSTANT(Char, capital_e = static_cast<Char>('E'));
+            BOOST_STATIC_CONSTANT(Char, c_decimal_separator = static_cast<Char>('.'));
+        };
+    }
+} // namespace boost
+
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_LCAST_CHAR_CONSTANTS_HPP
+