63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
// 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
|