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78 lines
2.7 KiB
78 lines
2.7 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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// regex_byref_matcher.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_REGEX_BYREF_MATCHER_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_REGEX_BYREF_MATCHER_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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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/assert.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/xpressive/regex_error.hpp>
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#include <boost/xpressive/regex_constants.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/quant_style.hpp>
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#include <boost/xpressive/detail/core/state.hpp>
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#include <boost/xpressive/detail/core/regex_impl.hpp>
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#include <boost/xpressive/detail/core/adaptor.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// regex_byref_matcher
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//
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template<typename BidiIter>
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struct regex_byref_matcher
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: quant_style<quant_variable_width, unknown_width::value, false>
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{
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// avoid cyclic references by holding a weak_ptr to the
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// regex_impl struct
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weak_ptr<regex_impl<BidiIter> > wimpl_;
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// the basic_regex object holds a ref-count to this regex_impl, so
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// we don't have to worry about it going away.
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regex_impl<BidiIter> const *pimpl_;
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regex_byref_matcher(shared_ptr<regex_impl<BidiIter> > const &impl)
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: wimpl_(impl)
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, pimpl_(impl.get())
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{
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BOOST_ASSERT(this->pimpl_);
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}
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template<typename Next>
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bool match(match_state<BidiIter> &state, Next const &next) const
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{
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BOOST_ASSERT(this->pimpl_ == this->wimpl_.lock().get());
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BOOST_XPR_ENSURE_(this->pimpl_->xpr_, regex_constants::error_badref, "bad regex reference");
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return push_context_match(*this->pimpl_, state, this->wrap_(next, is_static_xpression<Next>()));
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}
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private:
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template<typename Next>
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static xpression_adaptor<reference_wrapper<Next const>, matchable<BidiIter> > wrap_(Next const &next, mpl::true_)
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{
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// wrap the static xpression in a matchable interface
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return xpression_adaptor<reference_wrapper<Next const>, matchable<BidiIter> >(boost::cref(next));
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}
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template<typename Next>
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static Next const &wrap_(Next const &next, mpl::false_)
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{
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return next;
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}
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};
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}}}
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#endif
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