mirror of
https://github.com/boostorg/optional.git
synced 2025-07-14 21:06:37 +02:00
37 lines
730 B
C++
37 lines
730 B
C++
// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
|
|
//
|
|
// 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)
|
|
//
|
|
// See http://www.boost.org/lib/optional/ for documentation.
|
|
//
|
|
// You are welcome to contact the author at:
|
|
// fernando_cacciola@hotmail.com
|
|
//
|
|
#ifndef BOOST_NONE_17SEP2003_HPP
|
|
#define BOOST_NONE_17SEP2003_HPP
|
|
|
|
#include <boost/detail/workaround.hpp>
|
|
|
|
namespace boost {
|
|
|
|
#if BOOST_WORKAROUND(__BORLANDC__, <= 0x564)
|
|
|
|
namespace detail { struct none_helper{}; }
|
|
|
|
typedef int detail::none_helper::*none_t ;
|
|
|
|
none_t const none = ((none_t)0) ;
|
|
|
|
#else
|
|
|
|
enum none_t {none = 0};
|
|
|
|
#endif
|
|
|
|
} // namespace boost
|
|
|
|
#endif
|
|
|