44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
|
|
#ifndef BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED
|
|
#define BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED
|
|
|
|
// Copyright Aleksey Gurtovoy 2000-2004
|
|
//
|
|
// 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)
|
|
//
|
|
// See http://www.boost.org/libs/mpl for documentation.
|
|
|
|
// $Id$
|
|
// $Date$
|
|
// $Revision$
|
|
|
|
#include <boost/mpl/empty_fwd.hpp>
|
|
#include <boost/mpl/begin_end.hpp>
|
|
#include <boost/mpl/aux_/traits_lambda_spec.hpp>
|
|
#include <boost/type_traits/is_same.hpp>
|
|
|
|
namespace boost { namespace mpl {
|
|
|
|
// default implementation; conrete sequences might override it by
|
|
// specializing either the 'empty_impl' or the primary 'empty' template
|
|
|
|
template< typename Tag >
|
|
struct empty_impl
|
|
{
|
|
template< typename Sequence > struct apply
|
|
: is_same<
|
|
typename begin<Sequence>::type
|
|
, typename end<Sequence>::type
|
|
>
|
|
{
|
|
};
|
|
};
|
|
|
|
BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1,empty_impl)
|
|
|
|
}}
|
|
|
|
#endif // BOOST_MPL_AUX_EMPTY_IMPL_HPP_INCLUDED
|