1/*=============================================================================
2 Copyright (c) 2001-2011 Hartmut Kaiser
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6==============================================================================*/
7#if !defined(BOOST_SPIRIT_HAS_SEMANTIC_ACTION_SEP_20_2009_0626PM)
8#define BOOST_SPIRIT_HAS_SEMANTIC_ACTION_SEP_20_2009_0626PM
9
10#if defined(_MSC_VER)
11#pragma once
12#endif
13
14#include <boost/mpl/bool.hpp>
15#include <boost/mpl/or.hpp>
16#include <boost/mpl/not.hpp>
17#include <boost/mpl/find_if.hpp>
18#include <boost/type_traits/is_same.hpp>
19
20namespace boost { namespace spirit { namespace traits
21{
22 // finding out, whether a component contains a semantic action
23 template <typename T, typename Enable = void>
24 struct has_semantic_action
25 : mpl::false_ {};
26
27 template <typename Subject>
28 struct unary_has_semantic_action
29 : has_semantic_action<Subject> {};
30
31 template <typename Left, typename Right>
32 struct binary_has_semantic_action
33 : mpl::or_<has_semantic_action<Left>, has_semantic_action<Right> > {};
34
35 template <typename Elements>
36 struct nary_has_semantic_action
37 : mpl::not_<
38 is_same<
39 typename mpl::find_if<
40 Elements, has_semantic_action<mpl::_>
41 >::type
42 , typename mpl::end<Elements>::type
43 >
44 > {};
45}}}
46
47#endif
48