[ceph.git] / ceph / src / boost / libs / parameter / include / boost / parameter / aux_ / is_maybe.hpp

// Copyright Daniel Wallin, David Abrahams 2010. Use, modification and
// distribution is subject to 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 BOOST_PARAMETER_IS_MAYBE_050329_HPP
#define BOOST_PARAMETER_IS_MAYBE_050329_HPP

#include <boost/type_traits/is_base_and_derived.hpp>

namespace boost {
namespace parameter {
namespace aux {

struct maybe_base {};

template <class T>
struct is_maybe
  : is_base_and_derived<maybe_base, T>
{};

} // namespace aux
} // namespace parameter
} // namespace boost

#endif // BOOST_PARAMETER_IS_MAYBE_050329_HPP
Commit	Line	Data
7c673cae FG	1	// Copyright Daniel Wallin, David Abrahams 2010. Use, modification and
	2	// distribution is subject to the Boost Software License, Version 1.0. (See
	3	// accompanying file LICENSE_1_0.txt or copy at
	4	// http://www.boost.org/LICENSE_1_0.txt)
	5
	6	#ifndef BOOST_PARAMETER_IS_MAYBE_050329_HPP
	7	#define BOOST_PARAMETER_IS_MAYBE_050329_HPP
	8
	9	#include <boost/type_traits/is_base_and_derived.hpp>
	10
	11	namespace boost {
	12	namespace parameter {
	13	namespace aux {
	14
	15	struct maybe_base {};
	16
	17	template <class T>
	18	struct is_maybe
	19	: is_base_and_derived<maybe_base, T>
	20	{};
	21
	22	} // namespace aux
	23	} // namespace parameter
	24	} // namespace boost
	25
	26	#endif // BOOST_PARAMETER_IS_MAYBE_050329_HPP