[ceph.git] / ceph / src / boost / libs / type_erasure / include / boost / type_erasure / is_placeholder.hpp

// Boost.TypeErasure library
//
// Copyright 2011 Steven Watanabe
//
// 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)
//
// $Id$

#ifndef BOOST_TYPE_ERASURE_DETAIL_IS_PLACEHOLDER_HPP_INCLUDED
#define BOOST_TYPE_ERASURE_DETAIL_IS_PLACEHOLDER_HPP_INCLUDED

#include <boost/mpl/bool.hpp>
#include <boost/type_traits/is_base_and_derived.hpp>
#include <boost/type_erasure/placeholder.hpp>

namespace boost {

namespace type_erasure {

/** A metafunction that indicates whether a type is a @ref placeholder. */
template<class T>
struct is_placeholder : ::boost::is_base_and_derived<placeholder, T> {};

}
}

#endif
Commit	Line	Data
7c673cae FG	1	// Boost.TypeErasure library
	2	//
	3	// Copyright 2011 Steven Watanabe
	4	//
	5	// Distributed under the Boost Software License Version 1.0. (See
	6	// accompanying file LICENSE_1_0.txt or copy at
	7	// http://www.boost.org/LICENSE_1_0.txt)
	8	//
	9	// $Id$
	10
	11	#ifndef BOOST_TYPE_ERASURE_DETAIL_IS_PLACEHOLDER_HPP_INCLUDED
	12	#define BOOST_TYPE_ERASURE_DETAIL_IS_PLACEHOLDER_HPP_INCLUDED
	13
	14	#include <boost/mpl/bool.hpp>
	15	#include <boost/type_traits/is_base_and_derived.hpp>
	16	#include <boost/type_erasure/placeholder.hpp>
	17
	18	namespace boost {
	19
	20	namespace type_erasure {
	21
	22	/** A metafunction that indicates whether a type is a @ref placeholder. */
	23	template<class T>
	24	struct is_placeholder : ::boost::is_base_and_derived<placeholder, T> {};
	25
	26	}
	27	}
	28
	29	#endif