/*============================================================================= Copyright (c) 2005-2010 Joel de Guzman Copyright (c) 2010 Eric Niebler Copyright (c) 2010 Thomas Heller 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) ==============================================================================*/ template < template class Actor , typename Tag , typename A0 = void , typename A1 = void , typename A2 = void , typename A3 = void , typename A4 = void , typename A5 = void , typename A6 = void , typename A7 = void , typename A8 = void , typename A9 = void , typename Dummy = void> struct expr_ext; template < typename Tag , typename A0 = void , typename A1 = void , typename A2 = void , typename A3 = void , typename A4 = void , typename A5 = void , typename A6 = void , typename A7 = void , typename A8 = void , typename A9 = void , typename Dummy = void > struct expr : expr_ext {}; template