def.hpp

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// Copyright (c) 2017 Kolya Kosenko
 
// Distributed under the Boost Software License, Version 1.0.
// See http://www.boost.org/LICENSE_1_0.txt
 
 
#ifndef BOOST_UI_DEF_HPP
#define BOOST_UI_DEF_HPP
 
#include <boost/ui/config.hpp>
 
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
 
namespace boost {
namespace ui    {
 
#ifndef DOXYGEN
 
struct nullopt_t {
    nullopt_t(int) {}
};
 
extern BOOST_UI_DECL nullopt_t nullopt;
 
#endif
 
} // namespace ui
} // namespace boost
 
#endif // BOOST_UI_DEF_HPP