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81 lines
2.3 KiB
81 lines
2.3 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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// adaptor.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_ADAPTOR_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_CORE_ADAPTOR_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/ref.hpp>
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#include <boost/implicit_cast.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/dynamic/matchable.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// xpression_adaptor
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//
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// wrap a static xpression in a matchable interface so it can be stored
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// in and invoked from a basic_regex object.
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template<typename Xpr, typename Base>
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struct xpression_adaptor
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: Base // either matchable or matchable_ex
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{
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typedef typename Base::iterator_type iterator_type;
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typedef typename iterator_value<iterator_type>::type char_type;
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Xpr xpr_;
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xpression_adaptor(Xpr const &xpr)
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#if BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4))
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// Ugh, gcc has an optimizer bug which elides this c'tor call
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// resulting in pure virtual function calls.
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__attribute__((__noinline__))
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#endif
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: xpr_(xpr)
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{
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}
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virtual bool match(match_state<iterator_type> &state) const
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{
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typedef typename boost::unwrap_reference<Xpr const>::type xpr_type;
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return implicit_cast<xpr_type &>(this->xpr_).match(state);
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}
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void link(xpression_linker<char_type> &linker) const
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{
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this->xpr_.link(linker);
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}
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void peek(xpression_peeker<char_type> &peeker) const
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{
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this->xpr_.peek(peeker);
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}
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private:
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xpression_adaptor &operator =(xpression_adaptor const &);
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};
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///////////////////////////////////////////////////////////////////////////////
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// make_adaptor
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//
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template<typename Base, typename Xpr>
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inline intrusive_ptr<Base const> make_adaptor(Xpr const &xpr)
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{
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return intrusive_ptr<Base const>(new xpression_adaptor<Xpr, Base>(xpr));
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}
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}}} // namespace boost::xpressive::detail
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#endif
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