ceph/src/boost/boost/xpressive/detail/core/adaptor.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // adaptor.hpp
   3 //
   4 //  Copyright 2008 Eric Niebler. Distributed under the Boost
   5 //  Software License, Version 1.0. (See accompanying file
   6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_XPRESSIVE_DETAIL_CORE_ADAPTOR_HPP_EAN_10_04_2005
   9 #define BOOST_XPRESSIVE_DETAIL_CORE_ADAPTOR_HPP_EAN_10_04_2005
  10
  11 // MS compatible compilers support #pragma once
  12 #if defined(_MSC_VER)
  13 # pragma once
  14 #endif
  15
  16 #include <boost/ref.hpp>
  17 #include <boost/implicit_cast.hpp>
  18 #include <boost/intrusive_ptr.hpp>
  19 #include <boost/xpressive/detail/detail_fwd.hpp>
  20 #include <boost/xpressive/detail/dynamic/matchable.hpp>
  21
  22 namespace boost { namespace xpressive { namespace detail
  23 {
  24
  25 ///////////////////////////////////////////////////////////////////////////////
  26 // xpression_adaptor
  27 //
  28 //   wrap a static xpression in a matchable interface so it can be stored
  29 //   in and invoked from a basic_regex object.
  30 template<typename Xpr, typename Base>
  31 struct xpression_adaptor
  32   : Base // either matchable or matchable_ex
  33 {
  34     typedef typename Base::iterator_type iterator_type;
  35     typedef typename iterator_value<iterator_type>::type char_type;
  36
  37     Xpr xpr_;
  38
  39     xpression_adaptor(Xpr const &xpr)
  40     #if BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(4))
  41         // Ugh, gcc has an optimizer bug which elides this c'tor call
  42         // resulting in pure virtual function calls.
  43         __attribute__((__noinline__))
  44     #endif
  45       : xpr_(xpr)
  46     {
  47     }
  48
  49     virtual bool match(match_state<iterator_type> &state) const
  50     {
  51         typedef typename boost::unwrap_reference<Xpr const>::type xpr_type;
  52         return implicit_cast<xpr_type &>(this->xpr_).match(state);
  53     }
  54
  55     void link(xpression_linker<char_type> &linker) const
  56     {
  57         this->xpr_.link(linker);
  58     }
  59
  60     void peek(xpression_peeker<char_type> &peeker) const
  61     {
  62         this->xpr_.peek(peeker);
  63     }
  64
  65 private:
  66     xpression_adaptor &operator =(xpression_adaptor const &);
  67 };
  68
  69 ///////////////////////////////////////////////////////////////////////////////
  70 // make_adaptor
  71 //
  72 template<typename Base, typename Xpr>
  73 inline intrusive_ptr<Base const> make_adaptor(Xpr const &xpr)
  74 {
  75     return intrusive_ptr<Base const>(new xpression_adaptor<Xpr, Base>(xpr));
  76 }
  77
  78 }}} // namespace boost::xpressive::detail
  79
  80 #endif