empty.hpp

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/*
    Copyright 2013 Adobe
    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)
*/
/**************************************************************************************************/
 
#ifndef ADOBE_EMPTY_HPP
#define ADOBE_EMPTY_HPP
 
/**************************************************************************************************/
 
#include <adobe/config.hpp>
 
#include <boost/mpl/bool.hpp>
#include <boost/operators.hpp>
 
#if defined(ADOBE_STD_SERIALIZATION)
#include <iosfwd>
#endif
 
/**************************************************************************************************/
 
namespace adobe {
inline namespace version_1 {
 
/**************************************************************************************************/

 
struct empty_t : private boost::totally_ordered<empty_t> {
    friend inline bool operator==(const empty_t&, const empty_t&) { return true; }
    friend inline bool operator<(const empty_t&, const empty_t&) { return false; }
    friend inline void swap(empty_t&, empty_t&) {}
};
 
#if defined(ADOBE_STD_SERIALIZATION)
std::ostream& operator<<(std::ostream& stream, const empty_t&);
#endif
 
/**************************************************************************************************/
 
} // namespace version_1
 
/**************************************************************************************************/


template <typename Derived>
struct empty_base {};
 
/**************************************************************************************************/
 
} // namespace adobe
 
/**************************************************************************************************/
 
#endif
 
/**************************************************************************************************/