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Updated single-header implementation

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[SVN r37420]
This commit is contained in:
Fernando Cacciola
2007-04-12 14:25:21 +00:00
parent 0fd45d73b1
commit bfd5cc0a87
1 changed files with 25 additions and 18 deletions
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37
include/boost/none.hpp
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@ -1,4 +1,6 @@
// Copyright (C) 2003, Fernando Luis Cacciola Carballal. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// Copyright (C) 2007, Anthony Williams
// Copyright (C) 2007, Steven Watanabe, Richard Smith
// //
// Distributed under the Boost Software License, Version 1.0. // Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at // (See accompanying file LICENSE_1_0.txt or copy at
@ -7,30 +9,35 @@
// See http://www.boost.org/lib/optional/ for documentation. // See http://www.boost.org/lib/optional/ for documentation.
// //
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando.cacciola@gmail.com
// //
#ifndef BOOST_NONE_17SEP2003_HPP #ifndef BOOST_NONE_17SEP2003_HPP
#define BOOST_NONE_17SEP2003_HPP #define BOOST_NONE_17SEP2003_HPP
#include <boost/detail/workaround.hpp> namespace boost
{
namespace detail
{
class none_helper;
}
namespace boost { inline void none(detail::none_helper);
#if BOOST_WORKAROUND(__BORLANDC__, <= 0x564) namespace detail
{
class none_helper
{
private:
namespace detail { struct none_helper{}; } none_helper( none_helper const& ) {}
typedef int detail::none_helper::*none_t ; friend void boost::none(none_helper);
};
}
none_t const none = ((none_t)0) ; typedef void (*none_t)(detail::none_helper);
#else inline void none(detail::none_helper) {}
}
enum none_t {none = 0};
#endif #endif
} // namespace boost
#endif