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 ///////////////////////////////////////////////////////////////////////////////
 /// \file regex_actions.hpp
 /// Defines the syntax elements of xpressive's action expressions.
 //
 //  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_ACTIONS_HPP_EAN_03_22_2007
 #define BOOST_XPRESSIVE_ACTIONS_HPP_EAN_03_22_2007
 
 // MS compatible compilers support #pragma once
 #if defined(_MSC_VER)
 # pragma once
 #endif
 
 #include <boost/config.hpp>
 #include <boost/preprocessor/punctuation/comma_if.hpp>
 #include <boost/ref.hpp>
 #include <boost/mpl/if.hpp>
 #include <boost/mpl/or.hpp>
 #include <boost/mpl/int.hpp>
 #include <boost/mpl/assert.hpp>
 #include <boost/noncopyable.hpp>
 #include <boost/lexical_cast.hpp>
 #include <boost/throw_exception.hpp>
 #include <boost/utility/enable_if.hpp>
 #include <boost/type_traits/is_same.hpp>
 #include <boost/type_traits/is_const.hpp>
 #include <boost/type_traits/is_integral.hpp>
 #include <boost/type_traits/decay.hpp>
 #include <boost/type_traits/remove_cv.hpp>
 #include <boost/type_traits/remove_reference.hpp>
 #include <boost/range/iterator_range.hpp>
 #include <boost/xpressive/detail/detail_fwd.hpp>
 #include <boost/xpressive/detail/core/state.hpp>
 #include <boost/xpressive/detail/core/matcher/attr_matcher.hpp>
 #include <boost/xpressive/detail/core/matcher/attr_end_matcher.hpp>
 #include <boost/xpressive/detail/core/matcher/attr_begin_matcher.hpp>
 #include <boost/xpressive/detail/core/matcher/predicate_matcher.hpp>
 #include <boost/xpressive/detail/utility/ignore_unused.hpp>
 #include <boost/xpressive/detail/static/type_traits.hpp>
 
 // These are very often needed by client code.
 #include <boost/typeof/std/map.hpp>
 #include <boost/typeof/std/string.hpp>
 
 // Doxygen can't handle proto :-(
 #ifndef BOOST_XPRESSIVE_DOXYGEN_INVOKED
 # include <boost/proto/core.hpp>
 # include <boost/proto/transform.hpp>
 # include <boost/xpressive/detail/core/matcher/action_matcher.hpp>
 #endif
 
 #if BOOST_MSVC
 #pragma warning(push)
 #pragma warning(disable : 4510) // default constructor could not be generated
 #pragma warning(disable : 4512) // assignment operator could not be generated
 #pragma warning(disable : 4610) // can never be instantiated - user defined constructor required
 #endif
 
 namespace boost { namespace xpressive
 {
 
     namespace detail
     {
         template<typename T, typename U>
         struct action_arg
         {
             typedef T type;
             typedef typename add_reference<T>::type reference;
 
             reference cast(void *pv) const
             {
                 return *static_cast<typename remove_reference<T>::type *>(pv);
             }
         };
 
         template<typename T>
         struct value_wrapper
           : private noncopyable
         {
             value_wrapper()
               : value()
             {}
 
             value_wrapper(T const &t)
               : value(t)
             {}
 
             T value;
         };
 
         struct check_tag
         {};
 
         struct BindArg
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename MatchResults, typename Expr>
             struct result<This(MatchResults, Expr)>
             {
                 typedef Expr type;
             };
 
             template<typename MatchResults, typename Expr>
             Expr const & operator ()(MatchResults &what, Expr const &expr) const
             {
                 what.let(expr);
                 return expr;
             }
         };
 
         struct let_tag
         {};
 
         // let(_a = b, _c = d)
         struct BindArgs
           : proto::function<
                 proto::terminal<let_tag>
               , proto::vararg<
                     proto::when<
                         proto::assign<proto::_, proto::_>
                       , proto::call<BindArg(proto::_data, proto::_)>
                     >
                 >
             >
         {};
 
         struct let_domain
           : boost::proto::domain<boost::proto::pod_generator<let_> >
         {};
 
         template<typename Expr>
         struct let_
         {
             BOOST_PROTO_BASIC_EXTENDS(Expr, let_<Expr>, let_domain)
             BOOST_PROTO_EXTENDS_FUNCTION()
         };
 
         template<typename Args, typename BidiIter>
         void bind_args(let_<Args> const &args, match_results<BidiIter> &what)
         {
             BindArgs()(args, 0, what);
         }
 
         typedef boost::proto::functional::make_expr<proto::tag::function, proto::default_domain> make_function;
     }
 
     namespace op
     {
         /// \brief \c at is a PolymorphicFunctionObject for indexing into a sequence
         struct at
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Cont, typename Idx>
             struct result<This(Cont &, Idx)>
             {
                 typedef typename Cont::reference type;
             };
 
             template<typename This, typename Cont, typename Idx>
             struct result<This(Cont const &, Idx)>
             {
                 typedef typename Cont::const_reference type;
             };
 
             template<typename This, typename Cont, typename Idx>
             struct result<This(Cont, Idx)>
             {
                 typedef typename Cont::const_reference type;
             };
 
             /// \pre    \c Cont is a model of RandomAccessSequence
             /// \param  c The RandomAccessSequence to index into
             /// \param  idx The index
             /// \return <tt>c[idx]</tt>
             template<typename Cont, typename Idx>
             typename Cont::reference operator()(Cont &c, Idx idx BOOST_PROTO_DISABLE_IF_IS_CONST(Cont)) const
             {
                 return c[idx];
             }
 
             /// \overload
             ///
             template<typename Cont, typename Idx>
             typename Cont::const_reference operator()(Cont const &c, Idx idx) const
             {
                 return c[idx];
             }
         };
 
         /// \brief \c push is a PolymorphicFunctionObject for pushing an element into a container.
         struct push
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \param seq The sequence into which the value should be pushed.
             /// \param val The value to push into the sequence.
             /// \brief Equivalent to <tt>seq.push(val)</tt>.
             /// \return \c void
             template<typename Sequence, typename Value>
             void operator()(Sequence &seq, Value const &val) const
             {
                 seq.push(val);
             }
         };
 
         /// \brief \c push_back is a PolymorphicFunctionObject for pushing an element into the back of a container.
         struct push_back
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \param seq The sequence into which the value should be pushed.
             /// \param val The value to push into the sequence.
             /// \brief Equivalent to <tt>seq.push_back(val)</tt>.
             /// \return \c void
             template<typename Sequence, typename Value>
             void operator()(Sequence &seq, Value const &val) const
             {
                 seq.push_back(val);
             }
         };
 
         /// \brief \c push_front is a PolymorphicFunctionObject for pushing an element into the front of a container.
         struct push_front
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \param seq The sequence into which the value should be pushed.
             /// \param val The value to push into the sequence.
             /// \brief Equivalent to <tt>seq.push_front(val)</tt>.
             /// \return \c void
             template<typename Sequence, typename Value>
             void operator()(Sequence &seq, Value const &val) const
             {
                 seq.push_front(val);
             }
         };
 
         /// \brief \c pop is a PolymorphicFunctionObject for popping an element from a container.
         struct pop
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \param seq The sequence from which to pop.
             /// \brief Equivalent to <tt>seq.pop()</tt>.
             /// \return \c void
             template<typename Sequence>
             void operator()(Sequence &seq) const
             {
                 seq.pop();
             }
         };
 
         /// \brief \c pop_back is a PolymorphicFunctionObject for popping an element from the back of a container.
         struct pop_back
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \param seq The sequence from which to pop.
             /// \brief Equivalent to <tt>seq.pop_back()</tt>.
             /// \return \c void
             template<typename Sequence>
             void operator()(Sequence &seq) const
             {
                 seq.pop_back();
             }
         };
 
         /// \brief \c pop_front is a PolymorphicFunctionObject for popping an element from the front of a container.
         struct pop_front
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \param seq The sequence from which to pop.
             /// \brief Equivalent to <tt>seq.pop_front()</tt>.
             /// \return \c void
             template<typename Sequence>
             void operator()(Sequence &seq) const
             {
                 seq.pop_front();
             }
         };
 
         /// \brief \c front is a PolymorphicFunctionObject for fetching the front element of a container.
         struct front
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Sequence>
             struct result<This(Sequence)>
             {
                 typedef typename remove_reference<Sequence>::type sequence_type;
                 typedef
                     typename mpl::if_c<
                         is_const<sequence_type>::value
                       , typename sequence_type::const_reference
                       , typename sequence_type::reference
                     >::type
                 type;
             };
 
             /// \param seq The sequence from which to fetch the front.
             /// \return <tt>seq.front()</tt>
             template<typename Sequence>
             typename result<front(Sequence &)>::type operator()(Sequence &seq) const
             {
                 return seq.front();
             }
         };
 
         /// \brief \c back is a PolymorphicFunctionObject for fetching the back element of a container.
         struct back
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Sequence>
             struct result<This(Sequence)>
             {
                 typedef typename remove_reference<Sequence>::type sequence_type;
                 typedef
                     typename mpl::if_c<
                         is_const<sequence_type>::value
                       , typename sequence_type::const_reference
                       , typename sequence_type::reference
                     >::type
                 type;
             };
 
             /// \param seq The sequence from which to fetch the back.
             /// \return <tt>seq.back()</tt>
             template<typename Sequence>
             typename result<back(Sequence &)>::type operator()(Sequence &seq) const
             {
                 return seq.back();
             }
         };
 
         /// \brief \c top is a PolymorphicFunctionObject for fetching the top element of a stack.
         struct top
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Sequence>
             struct result<This(Sequence)>
             {
                 typedef typename remove_reference<Sequence>::type sequence_type;
                 typedef
                     typename mpl::if_c<
                         is_const<sequence_type>::value
                       , typename sequence_type::value_type const &
                       , typename sequence_type::value_type &
                     >::type
                 type;
             };
 
             /// \param seq The sequence from which to fetch the top.
             /// \return <tt>seq.top()</tt>
             template<typename Sequence>
             typename result<top(Sequence &)>::type operator()(Sequence &seq) const
             {
                 return seq.top();
             }
         };
 
         /// \brief \c first is a PolymorphicFunctionObject for fetching the first element of a pair.
         struct first
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Pair>
             struct result<This(Pair)>
             {
                 typedef typename remove_reference<Pair>::type::first_type type;
             };
 
             /// \param p The pair from which to fetch the first element.
             /// \return <tt>p.first</tt>
             template<typename Pair>
             typename Pair::first_type operator()(Pair const &p) const
             {
                 return p.first;
             }
         };
 
         /// \brief \c second is a PolymorphicFunctionObject for fetching the second element of a pair.
         struct second
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Pair>
             struct result<This(Pair)>
             {
                 typedef typename remove_reference<Pair>::type::second_type type;
             };
 
             /// \param p The pair from which to fetch the second element.
             /// \return <tt>p.second</tt>
             template<typename Pair>
             typename Pair::second_type operator()(Pair const &p) const
             {
                 return p.second;
             }
         };
 
         /// \brief \c matched is a PolymorphicFunctionObject for assessing whether a \c sub_match object
         ///        matched or not.
         struct matched
         {
             BOOST_PROTO_CALLABLE()
             typedef bool result_type;
 
             /// \param sub The \c sub_match object.
             /// \return <tt>sub.matched</tt>
             template<typename Sub>
             bool operator()(Sub const &sub) const
             {
                 return sub.matched;
             }
         };
 
         /// \brief \c length is a PolymorphicFunctionObject for fetching the length of \c sub_match.
         struct length
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Sub>
             struct result<This(Sub)>
             {
                 typedef typename remove_reference<Sub>::type::difference_type type;
             };
 
             /// \param sub The \c sub_match object.
             /// \return <tt>sub.length()</tt>
             template<typename Sub>
             typename Sub::difference_type operator()(Sub const &sub) const
             {
                 return sub.length();
             }
         };
 
         /// \brief \c str is a PolymorphicFunctionObject for turning a \c sub_match into an
         ///        equivalent \c std::string.
         struct str
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Sub>
             struct result<This(Sub)>
             {
                 typedef typename remove_reference<Sub>::type::string_type type;
             };
 
             /// \param sub The \c sub_match object.
             /// \return <tt>sub.str()</tt>
             template<typename Sub>
             typename Sub::string_type operator()(Sub const &sub) const
             {
                 return sub.str();
             }
         };
 
         // This codifies the return types of the various insert member
         // functions found in sequence containers, the 2 flavors of
         // associative containers, and strings.
         //
         /// \brief \c insert is a PolymorphicFunctionObject for inserting a value or a
         ///        sequence of values into a sequence container, an associative
         ///        container, or a string.
         struct insert
         {
             BOOST_PROTO_CALLABLE()
 
             /// INTERNAL ONLY
             ///
             struct detail
             {
                 template<typename Sig, typename EnableIf = void>
                 struct result_detail
                 {};
 
                 // assoc containers
                 template<typename This, typename Cont, typename Value>
                 struct result_detail<This(Cont, Value), void>
                 {
                     typedef typename remove_reference<Cont>::type cont_type;
                     typedef typename remove_reference<Value>::type value_type;
                     static cont_type &scont_;
                     static value_type &svalue_;
                     typedef char yes_type;
                     typedef char (&no_type)[2];
                     static yes_type check_insert_return(typename cont_type::iterator);
                     static no_type check_insert_return(std::pair<typename cont_type::iterator, bool>);
                     BOOST_STATIC_CONSTANT(bool, is_iterator = (sizeof(yes_type) == sizeof(check_insert_return(scont_.insert(svalue_)))));
                     typedef
                         typename mpl::if_c<
                             is_iterator
                           , typename cont_type::iterator
                           , std::pair<typename cont_type::iterator, bool>
                         >::type
                     type;
                 };
 
                 // sequence containers, assoc containers, strings
                 template<typename This, typename Cont, typename It, typename Value>
                 struct result_detail<This(Cont, It, Value),
                     typename disable_if<
                         mpl::or_<
                             is_integral<typename remove_cv<typename remove_reference<It>::type>::type>
                           , is_same<
                                 typename remove_cv<typename remove_reference<It>::type>::type
                               , typename remove_cv<typename remove_reference<Value>::type>::type
                             >
                         >
                     >::type
                 >
                 {
                     typedef typename remove_reference<Cont>::type::iterator type;
                 };
 
                 // strings
                 template<typename This, typename Cont, typename Size, typename T>
                 struct result_detail<This(Cont, Size, T),
                     typename enable_if<
                         is_integral<typename remove_cv<typename remove_reference<Size>::type>::type>
                     >::type
                 >
                 {
                     typedef typename remove_reference<Cont>::type &type;
                 };
 
                 // assoc containers
                 template<typename This, typename Cont, typename It>
                 struct result_detail<This(Cont, It, It), void>
                 {
                     typedef void type;
                 };
 
                 // sequence containers, strings
                 template<typename This, typename Cont, typename It, typename Size, typename Value>
                 struct result_detail<This(Cont, It, Size, Value),
                     typename disable_if<
                         is_integral<typename remove_cv<typename remove_reference<It>::type>::type>
                     >::type
                 >
                 {
                     typedef void type;
                 };
 
                 // strings
                 template<typename This, typename Cont, typename Size, typename A0, typename A1>
                 struct result_detail<This(Cont, Size, A0, A1),
                     typename enable_if<
                         is_integral<typename remove_cv<typename remove_reference<Size>::type>::type>
                     >::type
                 >
                 {
                     typedef typename remove_reference<Cont>::type &type;
                 };
 
                 // strings
                 template<typename This, typename Cont, typename Pos0, typename String, typename Pos1, typename Length>
                 struct result_detail<This(Cont, Pos0, String, Pos1, Length)>
                 {
                     typedef typename remove_reference<Cont>::type &type;
                 };
             };
 
             template<typename Sig>
             struct result
             {
                 typedef typename detail::result_detail<Sig>::type type;
             };
 
             /// \overload
             ///
             template<typename Cont, typename A0>
             typename result<insert(Cont &, A0 const &)>::type
             operator()(Cont &cont, A0 const &a0) const
             {
                 return cont.insert(a0);
             }
 
             /// \overload
             ///
             template<typename Cont, typename A0, typename A1>
             typename result<insert(Cont &, A0 const &, A1 const &)>::type
             operator()(Cont &cont, A0 const &a0, A1 const &a1) const
             {
                 return cont.insert(a0, a1);
             }
 
             /// \overload
             ///
             template<typename Cont, typename A0, typename A1, typename A2>
             typename result<insert(Cont &, A0 const &, A1 const &, A2 const &)>::type
             operator()(Cont &cont, A0 const &a0, A1 const &a1, A2 const &a2) const
             {
                 return cont.insert(a0, a1, a2);
             }
 
             /// \param cont The container into which to insert the element(s)
             /// \param a0 A value, iterator, or count
             /// \param a1 A value, iterator, string, count, or character
             /// \param a2 A value, iterator, or count
             /// \param a3 A count
             /// \return \li For the form <tt>insert()(cont, a0)</tt>, return <tt>cont.insert(a0)</tt>.
             ///         \li For the form <tt>insert()(cont, a0, a1)</tt>, return <tt>cont.insert(a0, a1)</tt>.
             ///         \li For the form <tt>insert()(cont, a0, a1, a2)</tt>, return <tt>cont.insert(a0, a1, a2)</tt>.
             ///         \li For the form <tt>insert()(cont, a0, a1, a2, a3)</tt>, return <tt>cont.insert(a0, a1, a2, a3)</tt>.
             template<typename Cont, typename A0, typename A1, typename A2, typename A3>
             typename result<insert(Cont &, A0 const &, A1 const &, A2 const &, A3 const &)>::type
             operator()(Cont &cont, A0 const &a0, A1 const &a1, A2 const &a2, A3 const &a3) const
             {
                 return cont.insert(a0, a1, a2, a3);
             }
         };
 
         /// \brief \c make_pair is a PolymorphicFunctionObject for building a \c std::pair out of two parameters
         struct make_pair
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename First, typename Second>
             struct result<This(First, Second)>
             {
                 /// \brief For exposition only
                 typedef typename decay<First>::type first_type;
                 /// \brief For exposition only
                 typedef typename decay<Second>::type second_type;
                 typedef std::pair<first_type, second_type> type;
             };
 
             /// \param first The first element of the pair
             /// \param second The second element of the pair
             /// \return <tt>std::make_pair(first, second)</tt>
             template<typename First, typename Second>
             std::pair<First, Second> operator()(First const &first, Second const &second) const
             {
                 return std::make_pair(first, second);
             }
         };
 
         /// \brief \c as\<\> is a PolymorphicFunctionObject for lexically casting a parameter to a different type.
         /// \tparam T The type to which to lexically cast the parameter.
         template<typename T>
         struct as
         {
             BOOST_PROTO_CALLABLE()
             typedef T result_type;
 
             /// \param val The value to lexically cast.
             /// \return <tt>boost::lexical_cast\<T\>(val)</tt>
             template<typename Value>
             T operator()(Value const &val) const
             {
                 return boost::lexical_cast<T>(val);
             }
 
             // Hack around some limitations in boost::lexical_cast
             /// INTERNAL ONLY
             T operator()(csub_match const &val) const
             {
                 return val.matched
                   ? boost::lexical_cast<T>(boost::make_iterator_range(val.first, val.second))
                   : boost::lexical_cast<T>("");
             }
 
             #ifndef BOOST_XPRESSIVE_NO_WREGEX
             /// INTERNAL ONLY
             T operator()(wcsub_match const &val) const
             {
                 return val.matched
                   ? boost::lexical_cast<T>(boost::make_iterator_range(val.first, val.second))
                   : boost::lexical_cast<T>("");
             }
             #endif
 
             /// INTERNAL ONLY
             template<typename BidiIter>
             T operator()(sub_match<BidiIter> const &val) const
             {
                 // If this assert fires, you're trying to coerce a sequences of non-characters
                 // to some other type. Xpressive doesn't know how to do that.
                 typedef typename iterator_value<BidiIter>::type char_type;
                 BOOST_MPL_ASSERT_MSG(
                     (xpressive::detail::is_char<char_type>::value)
                   , CAN_ONLY_CONVERT_FROM_CHARACTER_SEQUENCES
                   , (char_type)
                 );
                 return this->impl(val, xpressive::detail::is_string_iterator<BidiIter>());
             }
 
         private:
             /// INTERNAL ONLY
             template<typename RandIter>
             T impl(sub_match<RandIter> const &val, mpl::true_) const
             {
                 return val.matched
                   ? boost::lexical_cast<T>(boost::make_iterator_range(&*val.first, &*val.first + (val.second - val.first)))
                   : boost::lexical_cast<T>("");
             }
 
             /// INTERNAL ONLY
             template<typename BidiIter>
             T impl(sub_match<BidiIter> const &val, mpl::false_) const
             {
                 return boost::lexical_cast<T>(val.str());
             }
         };
 
         /// \brief \c static_cast_\<\> is a PolymorphicFunctionObject for statically casting a parameter to a different type.
         /// \tparam T The type to which to statically cast the parameter.
         template<typename T>
         struct static_cast_
         {
             BOOST_PROTO_CALLABLE()
             typedef T result_type;
 
             /// \param val The value to statically cast.
             /// \return <tt>static_cast\<T\>(val)</tt>
             template<typename Value>
             T operator()(Value const &val) const
             {
                 return static_cast<T>(val);
             }
         };
 
         /// \brief \c dynamic_cast_\<\> is a PolymorphicFunctionObject for dynamically casting a parameter to a different type.
         /// \tparam T The type to which to dynamically cast the parameter.
         template<typename T>
         struct dynamic_cast_
         {
             BOOST_PROTO_CALLABLE()
             typedef T result_type;
 
             /// \param val The value to dynamically cast.
             /// \return <tt>dynamic_cast\<T\>(val)</tt>
             template<typename Value>
             T operator()(Value const &val) const
             {
                 return dynamic_cast<T>(val);
             }
         };
 
         /// \brief \c const_cast_\<\> is a PolymorphicFunctionObject for const-casting a parameter to a cv qualification.
         /// \tparam T The type to which to const-cast the parameter.
         template<typename T>
         struct const_cast_
         {
             BOOST_PROTO_CALLABLE()
             typedef T result_type;
 
             /// \param val The value to const-cast.
             /// \pre Types \c T and \c Value differ only in cv-qualification.
             /// \return <tt>const_cast\<T\>(val)</tt>
             template<typename Value>
             T operator()(Value const &val) const
             {
                 return const_cast<T>(val);
             }
         };
 
         /// \brief \c construct\<\> is a PolymorphicFunctionObject for constructing a new object.
         /// \tparam T The type of the object to construct.
         template<typename T>
         struct construct
         {
             BOOST_PROTO_CALLABLE()
             typedef T result_type;
 
             /// \overload
             T operator()() const
             {
                 return T();
             }
 
             /// \overload
             template<typename A0>
             T operator()(A0 const &a0) const
             {
                 return T(a0);
             }
 
             /// \overload
             template<typename A0, typename A1>
             T operator()(A0 const &a0, A1 const &a1) const
             {
                 return T(a0, a1);
             }
 
             /// \param a0 The first argument to the constructor
             /// \param a1 The second argument to the constructor
             /// \param a2 The third argument to the constructor
             /// \return <tt>T(a0,a1,...)</tt>
             template<typename A0, typename A1, typename A2>
             T operator()(A0 const &a0, A1 const &a1, A2 const &a2) const
             {
                 return T(a0, a1, a2);
             }
         };
 
         /// \brief \c throw_\<\> is a PolymorphicFunctionObject for throwing an exception.
         /// \tparam Except The type of the object to throw.
         template<typename Except>
         struct throw_
         {
             BOOST_PROTO_CALLABLE()
             typedef void result_type;
 
             /// \overload
             void operator()() const
             {
                 BOOST_THROW_EXCEPTION(Except());
             }
 
             /// \overload
             template<typename A0>
             void operator()(A0 const &a0) const
             {
                 BOOST_THROW_EXCEPTION(Except(a0));
             }
 
             /// \overload
             template<typename A0, typename A1>
             void operator()(A0 const &a0, A1 const &a1) const
             {
                 BOOST_THROW_EXCEPTION(Except(a0, a1));
             }
 
             /// \param a0 The first argument to the constructor
             /// \param a1 The second argument to the constructor
             /// \param a2 The third argument to the constructor
             /// \throw <tt>Except(a0,a1,...)</tt>
             /// \note This function makes use of the \c BOOST_THROW_EXCEPTION macro
             ///       to actually throw the exception. See the documentation for the
             ///       Boost.Exception library.
             template<typename A0, typename A1, typename A2>
             void operator()(A0 const &a0, A1 const &a1, A2 const &a2) const
             {
                 BOOST_THROW_EXCEPTION(Except(a0, a1, a2));
             }
         };
 
         /// \brief \c unwrap_reference is a PolymorphicFunctionObject for unwrapping a <tt>boost::reference_wrapper\<\></tt>.
         struct unwrap_reference
         {
             BOOST_PROTO_CALLABLE()
             template<typename Sig>
             struct result {};
 
             template<typename This, typename Ref>
             struct result<This(Ref)>
             {
                 typedef typename boost::unwrap_reference<Ref>::type &type;
             };
 
             template<typename This, typename Ref>
             struct result<This(Ref &)>
             {
                 typedef typename boost::unwrap_reference<Ref>::type &type;
             };
 
             /// \param r The <tt>boost::reference_wrapper\<T\></tt> to unwrap.
             /// \return <tt>static_cast\<T &\>(r)</tt>
             template<typename T>
             T &operator()(boost::reference_wrapper<T> r) const
             {
                 return static_cast<T &>(r);
             }
         };
     }
 
     /// \brief A unary metafunction that turns an ordinary function object type into the type of
     /// a deferred function object for use in xpressive semantic actions.
     ///
     /// Use \c xpressive::function\<\> to turn an ordinary polymorphic function object type
     /// into a type that can be used to declare an object for use in xpressive semantic actions.
     ///
     /// For example, the global object \c xpressive::push_back can be used to create deferred actions
     /// that have the effect of pushing a value into a container. It is defined with
     /// \c xpressive::function\<\> as follows:
     ///
     /** \code
         xpressive::function<xpressive::op::push_back>::type const push_back = {};
         \endcode
     */
     ///
     /// where \c op::push_back is an ordinary function object that pushes its second argument into
     /// its first. Thus defined, \c xpressive::push_back can be used in semantic actions as follows:
     ///
     /** \code
         namespace xp = boost::xpressive;
         using xp::_;
         std::list<int> result;
         std::string str("1 23 456 7890");
         xp::sregex rx = (+_d)[ xp::push_back(xp::ref(result), xp::as<int>(_) ]
             >> *(' ' >> (+_d)[ xp::push_back(xp::ref(result), xp::as<int>(_) ) ]);
         \endcode
     */
     template<typename PolymorphicFunctionObject>
     struct function
     {
         typedef typename proto::terminal<PolymorphicFunctionObject>::type type;
     };
 
     /// \brief \c at is a lazy PolymorphicFunctionObject for indexing into a sequence in an
     /// xpressive semantic action.
     function<op::at>::type const at = {{}};
 
     /// \brief \c push is a lazy PolymorphicFunctionObject for pushing a value into a container in an
     /// xpressive semantic action.
     function<op::push>::type const push = {{}};
 
     /// \brief \c push_back is a lazy PolymorphicFunctionObject for pushing a value into a container in an
     /// xpressive semantic action.
     function<op::push_back>::type const push_back = {{}};
 
     /// \brief \c push_front is a lazy PolymorphicFunctionObject for pushing a value into a container in an
     /// xpressive semantic action.
     function<op::push_front>::type const push_front = {{}};
 
     /// \brief \c pop is a lazy PolymorphicFunctionObject for popping the top element from a sequence in an
     /// xpressive semantic action.
     function<op::pop>::type const pop = {{}};
 
     /// \brief \c pop_back is a lazy PolymorphicFunctionObject for popping the back element from a sequence in an
     /// xpressive semantic action.
     function<op::pop_back>::type const pop_back = {{}};
 
     /// \brief \c pop_front is a lazy PolymorphicFunctionObject for popping the front element from a sequence in an
     /// xpressive semantic action.
     function<op::pop_front>::type const pop_front = {{}};
 
     /// \brief \c top is a lazy PolymorphicFunctionObject for accessing the top element from a stack in an
     /// xpressive semantic action.
     function<op::top>::type const top = {{}};
 
     /// \brief \c back is a lazy PolymorphicFunctionObject for fetching the back element of a sequence in an
     /// xpressive semantic action.
     function<op::back>::type const back = {{}};
 
     /// \brief \c front is a lazy PolymorphicFunctionObject for fetching the front element of a sequence in an
     /// xpressive semantic action.
     function<op::front>::type const front = {{}};
 
     /// \brief \c first is a lazy PolymorphicFunctionObject for accessing the first element of a \c std::pair\<\> in an
     /// xpressive semantic action.
     function<op::first>::type const first = {{}};
 
     /// \brief \c second is a lazy PolymorphicFunctionObject for accessing the second element of a \c std::pair\<\> in an
     /// xpressive semantic action.
     function<op::second>::type const second = {{}};
 
     /// \brief \c matched is a lazy PolymorphicFunctionObject for accessing the \c matched member of a \c xpressive::sub_match\<\> in an
     /// xpressive semantic action.
     function<op::matched>::type const matched = {{}};
 
     /// \brief \c length is a lazy PolymorphicFunctionObject for computing the length of a \c xpressive::sub_match\<\> in an
     /// xpressive semantic action.
     function<op::length>::type const length = {{}};
 
     /// \brief \c str is a lazy PolymorphicFunctionObject for converting a \c xpressive::sub_match\<\> to a \c std::basic_string\<\> in an
     /// xpressive semantic action.
     function<op::str>::type const str = {{}};
 
     /// \brief \c insert is a lazy PolymorphicFunctionObject for inserting a value or a range of values into a sequence in an
     /// xpressive semantic action.
     function<op::insert>::type const insert = {{}};
 
     /// \brief \c make_pair is a lazy PolymorphicFunctionObject for making a \c std::pair\<\> in an
     /// xpressive semantic action.
     function<op::make_pair>::type const make_pair = {{}};
 
     /// \brief \c unwrap_reference is a lazy PolymorphicFunctionObject for unwrapping a \c boost::reference_wrapper\<\> in an
     /// xpressive semantic action.
     function<op::unwrap_reference>::type const unwrap_reference = {{}};
 
     /// \brief \c value\<\> is a lazy wrapper for a value that can be used in xpressive semantic actions.
     /// \tparam T The type of the value to store.
     ///
     /// Below is an example that shows where \c <tt>value\<\></tt> is useful.
     ///
     /** \code
         sregex good_voodoo(boost::shared_ptr<int> pi)
         {
             using namespace boost::xpressive;
             // Use val() to hold the shared_ptr by value:
             sregex rex = +( _d [ ++*val(pi) ] >> '!' );
             // OK, rex holds a reference count to the integer.
             return rex;
         }
         \endcode
     */
     ///
     /// In the above code, \c xpressive::val() is a function that returns a \c value\<\> object. Had
     /// \c val() not been used here, the operation <tt>++*pi</tt> would have been evaluated eagerly
     /// once, instead of lazily when the regex match happens.
     template<typename T>
     struct value
       : proto::extends<typename proto::terminal<T>::type, value<T> >
     {
         /// INTERNAL ONLY
         typedef proto::extends<typename proto::terminal<T>::type, value<T> > base_type;
 
         /// \brief Store a default-constructed \c T
         value()
           : base_type()
         {}
 
         /// \param t The initial value.
         /// \brief Store a copy of \c t.
         explicit value(T const &t)
           : base_type(base_type::proto_base_expr::make(t))
         {}
 
         using base_type::operator=;
 
         /// \overload
         T &get()
         {
             return proto::value(*this);
         }
 
         /// \brief Fetch the stored value
         T const &get() const
         {
             return proto::value(*this);
         }
     };
 
     /// \brief \c reference\<\> is a lazy wrapper for a reference that can be used in 
     /// xpressive semantic actions.
     ///
     /// \tparam T The type of the referent.
     ///
     /// Here is an example of how to use \c reference\<\> to create a lazy reference to
     /// an existing object so it can be read and written in an xpressive semantic action.
     ///
     /** \code
         using namespace boost::xpressive;
         std::map<std::string, int> result;
         reference<std::map<std::string, int> > result_ref(result);
        
         // Match a word and an integer, separated by =>,
         // and then stuff the result into a std::map<>
         sregex pair = ( (s1= +_w) >> "=>" >> (s2= +_d) )
             [ result_ref[s1] = as<int>(s2) ];
         \endcode
     */
     template<typename T>
     struct reference
       : proto::extends<typename proto::terminal<reference_wrapper<T> >::type, reference<T> >
     {
         /// INTERNAL ONLY
         typedef proto::extends<typename proto::terminal<reference_wrapper<T> >::type, reference<T> > base_type;
 
         /// \param t Reference to object
         /// \brief Store a reference to \c t
         explicit reference(T &t)
           : base_type(base_type::proto_base_expr::make(boost::ref(t)))
         {}
 
         using base_type::operator=;
 
         /// \brief Fetch the stored value
         T &get() const
         {
             return proto::value(*this).get();
         }
     };
 
     /// \brief \c local\<\> is a lazy wrapper for a reference to a value that is stored within the local itself.
     /// It is for use within xpressive semantic actions.
     ///
     /// \tparam T The type of the local variable.
     ///
     /// Below is an example of how to use \c local\<\> in semantic actions.
     ///
     /** \code
         using namespace boost::xpressive;
         local<int> i(0);
         std::string str("1!2!3?");
         // count the exciting digits, but not the
         // questionable ones.
         sregex rex = +( _d [ ++i ] >> '!' );
         regex_search(str, rex);
         assert( i.get() == 2 );
         \endcode
     */
     ///
     /// \note As the name "local" suggests, \c local\<\> objects and the regexes
     /// that refer to them should never leave the local scope. The value stored
     /// within the local object will be destroyed at the end of the \c local\<\>'s
     /// lifetime, and any regex objects still holding the \c local\<\> will be
     /// left with a dangling reference.
     template<typename T>
     struct local
       : detail::value_wrapper<T>
       , proto::terminal<reference_wrapper<T> >::type
     {
         /// INTERNAL ONLY
         typedef typename proto::terminal<reference_wrapper<T> >::type base_type;
 
         /// \brief Store a default-constructed value of type \c T
         local()
           : detail::value_wrapper<T>()
           , base_type(base_type::make(boost::ref(detail::value_wrapper<T>::value)))
         {}
 
         /// \param t The initial value.
         /// \brief Store a default-constructed value of type \c T
         explicit local(T const &t)
           : detail::value_wrapper<T>(t)
           , base_type(base_type::make(boost::ref(detail::value_wrapper<T>::value)))
         {}
 
         using base_type::operator=;
 
         /// Fetch the wrapped value.
         T &get()
         {
             return proto::value(*this);
         }
 
         /// \overload
         T const &get() const
         {
             return proto::value(*this);
         }
     };
 
     /// \brief \c as() is a lazy funtion for lexically casting a parameter to a different type.
     /// \tparam T The type to which to lexically cast the parameter.
     /// \param a The lazy value to lexically cast.
     /// \return A lazy object that, when evaluated, lexically casts its argument to the desired type.
     template<typename T, typename A>
     typename detail::make_function::impl<op::as<T> const, A const &>::result_type const
     as(A const &a)
     {
         return detail::make_function::impl<op::as<T> const, A const &>()((op::as<T>()), a);
     }
 
     /// \brief \c static_cast_ is a lazy funtion for statically casting a parameter to a different type.
     /// \tparam T The type to which to statically cast the parameter.
     /// \param a The lazy value to statically cast.
     /// \return A lazy object that, when evaluated, statically casts its argument to the desired type.
     template<typename T, typename A>
     typename detail::make_function::impl<op::static_cast_<T> const, A const &>::result_type const
     static_cast_(A const &a)
     {
         return detail::make_function::impl<op::static_cast_<T> const, A const &>()((op::static_cast_<T>()), a);
     }
 
     /// \brief \c dynamic_cast_ is a lazy funtion for dynamically casting a parameter to a different type.
     /// \tparam T The type to which to dynamically cast the parameter.
     /// \param a The lazy value to dynamically cast.
     /// \return A lazy object that, when evaluated, dynamically casts its argument to the desired type.
     template<typename T, typename A>
     typename detail::make_function::impl<op::dynamic_cast_<T> const, A const &>::result_type const
     dynamic_cast_(A const &a)
     {
         return detail::make_function::impl<op::dynamic_cast_<T> const, A const &>()((op::dynamic_cast_<T>()), a);
     }
 
     /// \brief \c dynamic_cast_ is a lazy funtion for const-casting a parameter to a different type.
     /// \tparam T The type to which to const-cast the parameter.
     /// \param a The lazy value to const-cast.
     /// \return A lazy object that, when evaluated, const-casts its argument to the desired type.
     template<typename T, typename A>
     typename detail::make_function::impl<op::const_cast_<T> const, A const &>::result_type const
     const_cast_(A const &a)
     {
         return detail::make_function::impl<op::const_cast_<T> const, A const &>()((op::const_cast_<T>()), a);
     }
 
     /// \brief Helper for constructing \c value\<\> objects.
     /// \return <tt>value\<T\>(t)</tt>
     template<typename T>
     value<T> const val(T const &t)
     {
         return value<T>(t);
     }
 
     /// \brief Helper for constructing \c reference\<\> objects.
     /// \return <tt>reference\<T\>(t)</tt>
     template<typename T>
     reference<T> const ref(T &t)
     {
         return reference<T>(t);
     }
 
     /// \brief Helper for constructing \c reference\<\> objects that
     /// store a reference to const.
     /// \return <tt>reference\<T const\>(t)</tt>
     template<typename T>
     reference<T const> const cref(T const &t)
     {
         return reference<T const>(t);
     }
 
     /// \brief For adding user-defined assertions to your regular expressions.
     ///
     /// \param t The UnaryPredicate object or Boolean semantic action.
     ///
     /// A \RefSect{user_s_guide.semantic_actions_and_user_defined_assertions.user_defined_assertions,user-defined assertion}
     /// is a kind of semantic action that evaluates
     /// a Boolean lambda and, if it evaluates to false, causes the match to
     /// fail at that location in the string. This will cause backtracking,
     /// so the match may ultimately succeed.
     ///
     /// To use \c check() to specify a user-defined assertion in a regex, use the
     /// following syntax:
     ///
     /** \code
         sregex s = (_d >> _d)[check( XXX )]; // XXX is a custom assertion
         \endcode
     */
     ///
     /// The assertion is evaluated with a \c sub_match\<\> object that delineates
     /// what part of the string matched the sub-expression to which the assertion
     /// was attached.
     ///
     /// \c check() can be used with an ordinary predicate that takes a
     /// \c sub_match\<\> object as follows:
     ///
     /** \code
         // A predicate that is true IFF a sub-match is
         // either 3 or 6 characters long.
         struct three_or_six
         {
             bool operator()(ssub_match const &sub) const
             {
                 return sub.length() == 3 || sub.length() == 6;
             }
         };
 
         // match words of 3 characters or 6 characters.
         sregex rx = (bow >> +_w >> eow)[ check(three_or_six()) ] ;
         \endcode
     */
     ///
     /// Alternately, \c check() can be used to define inline custom
     /// assertions with the same syntax as is used to define semantic
     /// actions. The following code is equivalent to above:
     ///
     /** \code
         // match words of 3 characters or 6 characters.
         sregex rx = (bow >> +_w >> eow)[ check(length(_)==3 || length(_)==6) ] ;
         \endcode
     */
     ///
     /// Within a custom assertion, \c _ is a placeholder for the \c sub_match\<\>
     /// That delineates the part of the string matched by the sub-expression to
     /// which the custom assertion was attached.
 #ifdef BOOST_XPRESSIVE_DOXYGEN_INVOKED // A hack so Doxygen emits something more meaningful.
     template<typename T>
     detail::unspecified check(T const &t);
 #else
     proto::terminal<detail::check_tag>::type const check = {{}};
 #endif
 
     /// \brief For binding local variables to placeholders in semantic actions when
     /// constructing a \c regex_iterator or a \c regex_token_iterator.
     ///
     /// \param args A set of argument bindings, where each argument binding is an assignment
     /// expression, the left hand side of which must be an instance of \c placeholder\<X\>
     /// for some \c X, and the right hand side is an lvalue of type \c X.
     ///
     /// \c xpressive::let() serves the same purpose as <tt>match_results::let()</tt>;
     /// that is, it binds a placeholder to a local value. The purpose is to allow a
     /// regex with semantic actions to be defined that refers to objects that do not yet exist.
     /// Rather than referring directly to an object, a semantic action can refer to a placeholder,
     /// and the value of the placeholder can be specified later with a <em>let expression</em>.
     /// The <em>let expression</em> created with \c let() is passed to the constructor of either
     /// \c regex_iterator or \c regex_token_iterator.
     ///
     /// See the section \RefSect{user_s_guide.semantic_actions_and_user_defined_assertions.referring_to_non_local_variables, "Referring to Non-Local Variables"}
     /// in the Users' Guide for more discussion.
     ///
     /// \em Example:
     ///
     /**
         \code
         // Define a placeholder for a map object:
         placeholder<std::map<std::string, int> > _map;
 
         // Match a word and an integer, separated by =>,
         // and then stuff the result into a std::map<>
         sregex pair = ( (s1= +_w) >> "=>" >> (s2= +_d) )
             [ _map[s1] = as<int>(s2) ];
 
         // The string to parse
         std::string str("aaa=>1 bbb=>23 ccc=>456");
 
         // Here is the actual map to fill in:
         std::map<std::string, int> result;
 
         // Create a regex_iterator to find all the matches
         sregex_iterator it(str.begin(), str.end(), pair, let(_map=result));
         sregex_iterator end;
 
         // step through all the matches, and fill in
         // the result map
         while(it != end)
             ++it;
 
         std::cout << result["aaa"] << '\n';
         std::cout << result["bbb"] << '\n';
         std::cout << result["ccc"] << '\n';
         \endcode
     */
     ///
     /// The above code displays:
     ///
     /** \code{.txt}
         1
         23
         456
         \endcode
     */
 #ifdef BOOST_XPRESSIVE_DOXYGEN_INVOKED // A hack so Doxygen emits something more meaningful.
     template<typename...ArgBindings>
     detail::unspecified let(ArgBindings const &...args);
 #else
     detail::let_<proto::terminal<detail::let_tag>::type> const let = {{{}}};
 #endif
 
     /// \brief For defining a placeholder to stand in for a variable a semantic action.
     ///
     /// Use \c placeholder\<\> to define a placeholder for use in semantic actions to stand
     /// in for real objects. The use of placeholders allows regular expressions with actions
     /// to be defined once and reused in many contexts to read and write from objects which
     /// were not available when the regex was defined.
     ///
     /// \tparam T The type of the object for which this placeholder stands in.
     /// \tparam I An optional identifier that can be used to distinguish this placeholder
     ///           from others that may be used in the same semantic action that happen
     ///           to have the same type.
     ///
     /// You can use \c placeholder\<\> by creating an object of type \c placeholder\<T\>
     /// and using that object in a semantic action exactly as you intend an object of
     /// type \c T to be used.
     ///
     /**
         \code
         placeholder<int> _i;
         placeholder<double> _d;
 
         sregex rex = ( some >> regex >> here )
             [ ++_i, _d *= _d ];
         \endcode
     */
     ///
     /// Then, when doing a pattern match with either \c regex_search(),
     /// \c regex_match() or \c regex_replace(), pass a \c match_results\<\> object that
     /// contains bindings for the placeholders used in the regex object's semantic actions.
     /// You can create the bindings by calling \c match_results::let as follows:
     ///
     /**
         \code
         int i = 0;
         double d = 3.14;
 
         smatch what;
         what.let(_i = i)
             .let(_d = d);
 
         if(regex_match("some string", rex, what))
            // i and d mutated here
         \endcode
     */
     ///
     /// If a semantic action executes that contains an unbound placeholder, a exception of
     /// type \c regex_error is thrown.
     ///
     /// See the discussion for \c xpressive::let() and the
     /// \RefSect{user_s_guide.semantic_actions_and_user_defined_assertions.referring_to_non_local_variables, "Referring to Non-Local Variables"}
     /// section in the Users' Guide for more information.
     ///
     /// <em>Example:</em>
     ///
     /**
         \code
         // Define a placeholder for a map object:
         placeholder<std::map<std::string, int> > _map;
 
         // Match a word and an integer, separated by =>,
         // and then stuff the result into a std::map<>
         sregex pair = ( (s1= +_w) >> "=>" >> (s2= +_d) )
             [ _map[s1] = as<int>(s2) ];
 
         // Match one or more word/integer pairs, separated
         // by whitespace.
         sregex rx = pair >> *(+_s >> pair);
 
         // The string to parse
         std::string str("aaa=>1 bbb=>23 ccc=>456");
 
         // Here is the actual map to fill in:
         std::map<std::string, int> result;
 
         // Bind the _map placeholder to the actual map
         smatch what;
         what.let( _map = result );
 
         // Execute the match and fill in result map
         if(regex_match(str, what, rx))
         {
             std::cout << result["aaa"] << '\n';
             std::cout << result["bbb"] << '\n';
             std::cout << result["ccc"] << '\n';
         }
         \endcode
     */
 #ifdef BOOST_XPRESSIVE_DOXYGEN_INVOKED // A hack so Doxygen emits something more meaningful.
     template<typename T, int I = 0>
     struct placeholder
     {
         /// \param t The object to associate with this placeholder
         /// \return An object of unspecified type that records the association of \c t
         /// with \c *this.
         detail::unspecified operator=(T &t) const;
         /// \overload
         detail::unspecified operator=(T const &t) const;
     };
 #else
     template<typename T, int I, typename Dummy>
     struct placeholder
     {
         typedef placeholder<T, I, Dummy> this_type;
         typedef
             typename proto::terminal<detail::action_arg<T, mpl::int_<I> > >::type
         action_arg_type;
 
         BOOST_PROTO_EXTENDS(action_arg_type, this_type, proto::default_domain)
     };
 #endif
 
     /// \brief A lazy funtion for constructing objects objects of the specified type.
     /// \tparam T The type of object to construct.
     /// \param args The arguments to the constructor.
     /// \return A lazy object that, when evaluated, returns <tt>T(xs...)</tt>, where
     ///         <tt>xs...</tt> is the result of evaluating the lazy arguments
     ///         <tt>args...</tt>.
 #ifdef BOOST_XPRESSIVE_DOXYGEN_INVOKED // A hack so Doxygen emits something more meaningful.
     template<typename T, typename ...Args>
     detail::unspecified construct(Args const &...args);
 #else
 /// INTERNAL ONLY
 #define BOOST_PROTO_LOCAL_MACRO(N, typename_A, A_const_ref, A_const_ref_a, a)                       \
     template<typename X2_0 BOOST_PP_COMMA_IF(N) typename_A(N)>                                      \
     typename detail::make_function::impl<                                                           \
         op::construct<X2_0> const                                                                   \
         BOOST_PP_COMMA_IF(N) A_const_ref(N)                                                         \
     >::result_type const                                                                            \
     construct(A_const_ref_a(N))                                                                     \
     {                                                                                               \
         return detail::make_function::impl<                                                         \
             op::construct<X2_0> const                                                               \
             BOOST_PP_COMMA_IF(N) A_const_ref(N)                                                     \
         >()((op::construct<X2_0>()) BOOST_PP_COMMA_IF(N) a(N));                                     \
     }                                                                                               \
                                                                                                     \
     template<typename X2_0 BOOST_PP_COMMA_IF(N) typename_A(N)>                                      \
     typename detail::make_function::impl<                                                           \
         op::throw_<X2_0> const                                                                      \
         BOOST_PP_COMMA_IF(N) A_const_ref(N)                                                         \
     >::result_type const                                                                            \
     throw_(A_const_ref_a(N))                                                                        \
     {                                                                                               \
         return detail::make_function::impl<                                                         \
             op::throw_<X2_0> const                                                                  \
             BOOST_PP_COMMA_IF(N) A_const_ref(N)                                                     \
         >()((op::throw_<X2_0>()) BOOST_PP_COMMA_IF(N) a(N));                                        \
     }                                                                                               \
     /**/
 
     #define BOOST_PROTO_LOCAL_a         BOOST_PROTO_a                               ///< INTERNAL ONLY
     #define BOOST_PROTO_LOCAL_LIMITS    (0, BOOST_PP_DEC(BOOST_PROTO_MAX_ARITY))    ///< INTERNAL ONLY
     #include BOOST_PROTO_LOCAL_ITERATE()
 #endif
 
     namespace detail
     {
         inline void ignore_unused_regex_actions()
         {
             detail::ignore_unused(xpressive::at);
             detail::ignore_unused(xpressive::push);
             detail::ignore_unused(xpressive::push_back);
             detail::ignore_unused(xpressive::push_front);
             detail::ignore_unused(xpressive::pop);
             detail::ignore_unused(xpressive::pop_back);
             detail::ignore_unused(xpressive::pop_front);
             detail::ignore_unused(xpressive::top);
             detail::ignore_unused(xpressive::back);
             detail::ignore_unused(xpressive::front);
             detail::ignore_unused(xpressive::first);
             detail::ignore_unused(xpressive::second);
             detail::ignore_unused(xpressive::matched);
             detail::ignore_unused(xpressive::length);
             detail::ignore_unused(xpressive::str);
             detail::ignore_unused(xpressive::insert);
             detail::ignore_unused(xpressive::make_pair);
             detail::ignore_unused(xpressive::unwrap_reference);
             detail::ignore_unused(xpressive::check);
             detail::ignore_unused(xpressive::let);
         }
 
         struct mark_nbr
         {
             BOOST_PROTO_CALLABLE()
             typedef int result_type;
 
             int operator()(mark_placeholder m) const
             {
                 return m.mark_number_;
             }
         };
 
         struct ReplaceAlgo
           : proto::or_<
                 proto::when<
                     proto::terminal<mark_placeholder>
                   , op::at(proto::_data, proto::call<mark_nbr(proto::_value)>)
                 >
               , proto::when<
                     proto::terminal<any_matcher>
                   , op::at(proto::_data, proto::size_t<0>)
                 >
               , proto::when<
                     proto::terminal<reference_wrapper<proto::_> >
                   , op::unwrap_reference(proto::_value)
                 >
               , proto::_default<ReplaceAlgo>
             >
         {};
     }
 }}
 
 #if BOOST_MSVC
 #pragma warning(pop)
 #endif
 
 #endif // BOOST_XPRESSIVE_ACTIONS_HPP_EAN_03_22_2007

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