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// 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
// $Id$


#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> {};