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 xpression_adaptorboost::xpressive::detail::xpression_adaptor39 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 matchboost::xpressive::detail::xpression_adaptor49 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 linkboost::xpressive::detail::xpression_adaptor55 void link(xpression_linker<char_type> &linker) const 56 { 57 this->xpr_.link(linker); 58 } 59 peekboost::xpressive::detail::xpression_adaptor60 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> make_adaptor(Xpr const & xpr)73inline 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 81