| /*============================================================================= | |
| Copyright (c) 2001-2011 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 |