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- // 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_QI_UNUSED_SKIPPER_JUL_25_2009_0921AM)
- #define BOOST_SPIRIT_QI_UNUSED_SKIPPER_JUL_25_2009_0921AM
- #if defined(_MSC_VER)
- #pragma once
- #endif
- #include <boost/spirit/home/support/unused.hpp>
- #include <boost/mpl/bool.hpp>
- namespace boost { namespace spirit { namespace qi { namespace detail
- {
- template <typename Skipper>
- struct unused_skipper : unused_type
- {
- unused_skipper(Skipper const& skipper_)
- : skipper(skipper_) {}
- Skipper const& skipper;
- // silence MSVC warning C4512: assignment operator could not be generated
- BOOST_DELETED_FUNCTION(unused_skipper& operator= (unused_skipper const&))
- };
- template <typename Skipper>
- struct is_unused_skipper
- : mpl::false_ {};
- template <typename Skipper>
- struct is_unused_skipper<unused_skipper<Skipper> >
- : mpl::true_ {};
- template <>
- struct is_unused_skipper<unused_type>
- : mpl::true_ {};
- // If a surrounding lexeme[] directive was specified, the current
- // skipper is of the type unused_skipper. In this case we
- // re-activate the skipper which was active before the skip[]
- // directive.
- template <typename Skipper>
- inline Skipper const&
- get_skipper(unused_skipper<Skipper> const& u)
- {
- return u.skipper;
- }
- // If no surrounding lexeme[] directive was specified we keep what we got.
- template <typename Skipper>
- inline Skipper const&
- get_skipper(Skipper const& u)
- {
- return u;
- }
- }}}}
- #endif
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