| /*============================================================================= |
| Copyright (c) 2001-2010 Hartmut Kaiser |
| |
| 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) |
| ==============================================================================*/ |
| #if !defined(BOOST_SPIRIT_HAS_SEMANTIC_ACTION_SEP_20_2009_0626PM) |
| #define BOOST_SPIRIT_HAS_SEMANTIC_ACTION_SEP_20_2009_0626PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <boost/mpl/bool.hpp> |
| #include <boost/mpl/or.hpp> |
| #include <boost/mpl/not.hpp> |
| #include <boost/mpl/find_if.hpp> |
| #include <boost/type_traits/is_same.hpp> |
| |
| namespace boost { namespace spirit { namespace traits |
| { |
| // finding out, whether a component contains a semantic action |
| template <typename T, typename Enable = void> |
| struct has_semantic_action |
| : mpl::false_ {}; |
| |
| template <typename Subject> |
| struct unary_has_semantic_action |
| : has_semantic_action<Subject> {}; |
| |
| template <typename Left, typename Right> |
| struct binary_has_semantic_action |
| : mpl::or_<has_semantic_action<Left>, has_semantic_action<Right> > {}; |
| |
| template <typename Elements> |
| struct nary_has_semantic_action |
| : mpl::not_< |
| is_same< |
| typename mpl::find_if< |
| Elements, has_semantic_action<mpl::_> |
| >::type |
| , typename mpl::end<Elements>::type |
| > |
| > {}; |
| |
| }}} |
| |
| #endif |