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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
// 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>
namespace boost {
namespace type_erasure {
#ifdef BOOST_TYPE_ERASURE_DOXYGEN
/** A metafunction that indicates whether a type is a @ref placeholder. */
template<class T>
struct is_placeholder {};
#else
template<class T, class Enable = void>
struct is_placeholder : ::boost::mpl::false_ {};
template<class T>
struct is_placeholder<T, typename T::_boost_type_erasure_is_placeholder> :
::boost::mpl::true_ {};
#endif
}
}
#endif