/////////////////////////////////////////////////////////////////////////////// | |
// 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) && (_MSC_VER >= 1020) | |
# 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 |