/*============================================================================= Copyright (c) 2001-2006 Joel de Guzman Use, modification and distribution is subject to 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) ==============================================================================*/ #if !defined(FUSION_HAS_KEY_09232005_1454) #define FUSION_HAS_KEY_09232005_1454 #include #include #include namespace boost { namespace fusion { struct void_; struct fusion_sequence_tag; namespace extension { template struct has_key_impl { template struct apply : mpl::not_::type, void_> > {}; }; } namespace result_of { template struct has_key : extension::has_key_impl::type>:: template apply {}; } template inline typename result_of::has_key::type has_key(Sequence const& seq) { static typename result_of::has_key::type result; return result; } }} #endif