48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Hartmut Kaiser
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_SPIRIT_HAS_SEMANTIC_ACTION_SEP_20_2009_0626PM)
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#define BOOST_SPIRIT_HAS_SEMANTIC_ACTION_SEP_20_2009_0626PM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/or.hpp>
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#include <boost/mpl/not.hpp>
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#include <boost/mpl/find_if.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost { namespace spirit { namespace traits
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{
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// finding out, whether a component contains a semantic action
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template <typename T, typename Enable = void>
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struct has_semantic_action
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: mpl::false_ {};
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template <typename Subject>
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struct unary_has_semantic_action
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: has_semantic_action<Subject> {};
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template <typename Left, typename Right>
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struct binary_has_semantic_action
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: mpl::or_<has_semantic_action<Left>, has_semantic_action<Right> > {};
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template <typename Elements>
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struct nary_has_semantic_action
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: mpl::not_<
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is_same<
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typename mpl::find_if<
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Elements, has_semantic_action<mpl::_>
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>::type
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, typename mpl::end<Elements>::type
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>
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> {};
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}}}
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#endif
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