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- ///////////////////////////////////////////////////////////////////////////////
- // regex_byref_matcher.hpp
- //
- // Copyright 2008 Eric Niebler. 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)
- #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_REGEX_BYREF_MATCHER_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_REGEX_BYREF_MATCHER_HPP_EAN_10_04_2005
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/assert.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/shared_ptr.hpp>
- #include <boost/xpressive/regex_error.hpp>
- #include <boost/xpressive/regex_constants.hpp>
- #include <boost/xpressive/detail/detail_fwd.hpp>
- #include <boost/xpressive/detail/core/quant_style.hpp>
- #include <boost/xpressive/detail/core/state.hpp>
- #include <boost/xpressive/detail/core/regex_impl.hpp>
- #include <boost/xpressive/detail/core/adaptor.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- ///////////////////////////////////////////////////////////////////////////////
- // regex_byref_matcher
- //
- template<typename BidiIter>
- struct regex_byref_matcher
- : quant_style<quant_variable_width, unknown_width::value, false>
- {
- // avoid cyclic references by holding a weak_ptr to the
- // regex_impl struct
- weak_ptr<regex_impl<BidiIter> > wimpl_;
- // the basic_regex object holds a ref-count to this regex_impl, so
- // we don't have to worry about it going away.
- regex_impl<BidiIter> const *pimpl_;
- regex_byref_matcher(shared_ptr<regex_impl<BidiIter> > const &impl)
- : wimpl_(impl)
- , pimpl_(impl.get())
- {
- BOOST_ASSERT(this->pimpl_);
- }
- template<typename Next>
- bool match(match_state<BidiIter> &state, Next const &next) const
- {
- BOOST_ASSERT(this->pimpl_ == this->wimpl_.lock().get());
- BOOST_XPR_ENSURE_(this->pimpl_->xpr_, regex_constants::error_badref, "bad regex reference");
- return push_context_match(*this->pimpl_, state, this->wrap_(next, is_static_xpression<Next>()));
- }
- private:
- template<typename Next>
- static xpression_adaptor<reference_wrapper<Next const>, matchable<BidiIter> > wrap_(Next const &next, mpl::true_)
- {
- // wrap the static xpression in a matchable interface
- return xpression_adaptor<reference_wrapper<Next const>, matchable<BidiIter> >(boost::cref(next));
- }
- template<typename Next>
- static Next const &wrap_(Next const &next, mpl::false_)
- {
- return next;
- }
- };
- }}}
- #endif
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