boost/mpl/as_sequence.hpp

0001
0002 #ifndef BOOST_MPL_AS_SEQUENCE_HPP_INCLUDED
0003 #define BOOST_MPL_AS_SEQUENCE_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2002-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/is_sequence.hpp>
0018 #include <boost/mpl/single_view.hpp>
0019 #include <boost/mpl/if.hpp>
0020 #include <boost/mpl/aux_/na_spec.hpp>
0021 #include <boost/mpl/aux_/lambda_support.hpp>
0022
0023 namespace boost { namespace mpl {
0024
0025 template<
0026       typename BOOST_MPL_AUX_NA_PARAM(T)
0027     >
0028 struct as_sequence
0029     : if_< is_sequence<T>, T, single_view<T> >
0030 {
0031     BOOST_MPL_AUX_LAMBDA_SUPPORT(1,as_sequence,(T))
0032 };
0033
0034 BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, as_sequence)
0035
0036 }}
0037
0038 #endif // BOOST_MPL_AS_SEQUENCE_HPP_INCLUDED