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#ifndef META_HS_EXCEPT_KEYWORDS_HPP
#define META_HS_EXCEPT_KEYWORDS_HPP
// Copyright Abel Sinkovics (abel@sinkovics.hu) 2012.
// 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)
#include <boost/metaparse/accept_when.hpp>
#include <boost/mpl/equal.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/not.hpp>
#include <boost/mpl/fold.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/apply_wrap.hpp>
struct keywords_are_not_allowed {};
template <class P, class Keywords>
class except_keywords
{
private:
template <class T>
struct not_a_keyword
{
typedef not_a_keyword type;
template <class Acc, class Keyword>
struct apply :
boost::mpl::and_<
Acc,
boost::mpl::not_<typename boost::mpl::equal<T, Keyword>::type>
>
{};
};
struct not_keyword
{
typedef not_keyword type;
template <class T>
struct apply :
boost::mpl::fold<Keywords, boost::mpl::true_, not_a_keyword<T> >
{};
};
public:
typedef except_keywords type;
template <class S, class Pos>
struct apply :
boost::mpl::apply_wrap2<
boost::metaparse::accept_when<P, not_keyword, keywords_are_not_allowed>,
S,
Pos
>
{};
};
#endif
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