container/generation/ignore.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001 Doug Gregor
0003     Copyright (c) 1999-2003 Jaakko Jarvi
0004     Copyright (c) 2001-2011 Joel de Guzman
0005
0006     Distributed under the Boost Software License, Version 1.0. (See accompanying
0007     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0008 ==============================================================================*/
0009 #if !defined(FUSION_IGNORE_07192005_0329)
0010 #define FUSION_IGNORE_07192005_0329
0011
0012 #include <boost/fusion/support/config.hpp>
0013
0014 namespace boost { namespace fusion
0015 {
0016     //  Swallows any assignment (by Doug Gregor)
0017     namespace detail
0018     {
0019         struct swallow_assign
0020         {
0021             template<typename T>
0022             BOOST_FUSION_CONSTEXPR_THIS BOOST_FUSION_GPU_ENABLED
0023             swallow_assign const&
0024             operator=(const T&) const
0025             {
0026                 return *this;
0027             }
0028         };
0029     }
0030
0031     //  "ignore" allows tuple positions to be ignored when using "tie".
0032     BOOST_CONSTEXPR_OR_CONST detail::swallow_assign ignore = detail::swallow_assign();
0033 }}
0034
0035 #endif