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 //  tuple_basic.hpp -----------------------------------------------------
 
 // Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
 //
 // 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)
 
 // For more information, see http://www.boost.org
 
 // Outside help:
 // This and that, Gary Powell.
 // Fixed return types for get_head/get_tail
 // ( and other bugs ) per suggestion of Jens Maurer
 // simplified element type accessors + bug fix  (Jeremy Siek)
 // Several changes/additions according to suggestions by Douglas Gregor,
 // William Kempf, Vesa Karvonen, John Max Skaller, Ed Brey, Beman Dawes,
 // David Abrahams.
 
 // Revision history:
 // 2002 05 01 Hugo Duncan: Fix for Borland after Jaakko's previous changes
 // 2002 04 18 Jaakko: tuple element types can be void or plain function
 //                    types, as long as no object is created.
 //                    Tuple objects can no hold even noncopyable types
 //                    such as arrays.
 // 2001 10 22 John Maddock
 //      Fixes for Borland C++
 // 2001 08 30 David Abrahams
 //      Added default constructor for cons<>.
 // -----------------------------------------------------------------
 
 #ifndef BOOST_TUPLE_BASIC_HPP
 #define BOOST_TUPLE_BASIC_HPP
 
 
 #include <utility> // needed for the assignment from pair to tuple
 #include <cstddef> // for std::size_t
 
 #include <boost/core/invoke_swap.hpp>
 #include <boost/type_traits/cv_traits.hpp>
 #include <boost/type_traits/function_traits.hpp>
 #include <boost/type_traits/integral_constant.hpp>
 
 #include <boost/detail/workaround.hpp> // needed for BOOST_WORKAROUND
 
 #if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-local-typedefs"
 #endif
 
 namespace boost {
 namespace tuples {
 
 // -- null_type --------------------------------------------------------
 struct null_type {};
 
 // a helper function to provide a const null_type type temporary
 namespace detail {
   inline const null_type cnull() { return null_type(); }
 
 
 // -- if construct ------------------------------------------------
 // Proposed by Krzysztof Czarnecki and Ulrich Eisenecker
 
 template <bool If, class Then, class Else> struct IF { typedef Then RET; };
 
 template <class Then, class Else> struct IF<false, Then, Else> {
   typedef Else RET;
 };
 
 } // end detail
 
 // - cons forward declaration -----------------------------------------------
 template <class HT, class TT> struct cons;
 
 
 // - tuple forward declaration -----------------------------------------------
 template <
   class T0 = null_type, class T1 = null_type, class T2 = null_type,
   class T3 = null_type, class T4 = null_type, class T5 = null_type,
   class T6 = null_type, class T7 = null_type, class T8 = null_type,
   class T9 = null_type>
 class tuple;
 
 // tuple_length forward declaration
 template<class T> struct length;
 
 
 
 namespace detail {
 
 // -- generate error template, referencing to non-existing members of this
 // template is used to produce compilation errors intentionally
 template<class T>
 class generate_error;
 
 template<std::size_t N>
 struct drop_front {
     template<class Tuple>
     struct apply {
         typedef BOOST_DEDUCED_TYPENAME drop_front<N-1>::BOOST_NESTED_TEMPLATE
             apply<Tuple> next;
         typedef BOOST_DEDUCED_TYPENAME next::type::tail_type type;
         static const type& call(const Tuple& tup) {
             return next::call(tup).tail;
         }
     };
 };
 
 template<>
 struct drop_front<0> {
     template<class Tuple>
     struct apply {
         typedef Tuple type;
         static const type& call(const Tuple& tup) {
             return tup;
         }
     };
 };
 
 } // end of namespace detail
 
 
 // -cons type accessors ----------------------------------------
 // typename tuples::element<N,T>::type gets the type of the
 // Nth element ot T, first element is at index 0
 // -------------------------------------------------------
 
 #ifndef BOOST_NO_CV_SPECIALIZATIONS
 
 template<std::size_t N, class T>
 struct element
 {
   typedef BOOST_DEDUCED_TYPENAME detail::drop_front<N>::BOOST_NESTED_TEMPLATE
       apply<T>::type::head_type type;
 };
 
 template<std::size_t N, class T>
 struct element<N, const T>
 {
 private:
   typedef BOOST_DEDUCED_TYPENAME detail::drop_front<N>::BOOST_NESTED_TEMPLATE
       apply<T>::type::head_type unqualified_type;
 public:
 #if BOOST_WORKAROUND(BOOST_BORLANDC,<0x600)
   typedef const unqualified_type type;
 #else
   typedef BOOST_DEDUCED_TYPENAME boost::add_const<unqualified_type>::type type;
 #endif
 };
 #else // def BOOST_NO_CV_SPECIALIZATIONS
 
 namespace detail {
 
 template<std::size_t N, class T, bool IsConst>
 struct element_impl
 {
   typedef BOOST_DEDUCED_TYPENAME detail::drop_front<N>::BOOST_NESTED_TEMPLATE
       apply<T>::type::head_type type;
 };
 
 template<std::size_t N, class T>
 struct element_impl<N, T, true /* IsConst */>
 {
   typedef BOOST_DEDUCED_TYPENAME detail::drop_front<N>::BOOST_NESTED_TEMPLATE
       apply<T>::type::head_type unqualified_type;
   typedef const unqualified_type type;
 };
 
 } // end of namespace detail
 
 
 template<std::size_t N, class T>
 struct element:
   public detail::element_impl<N, T, ::boost::is_const<T>::value>
 {
 };
 
 #endif
 
 
 // -get function templates -----------------------------------------------
 // Usage: get<N>(aTuple)
 
 // -- some traits classes for get functions
 
 // access traits lifted from detail namespace to be part of the interface,
 // (Joel de Guzman's suggestion). Rationale: get functions are part of the
 // interface, so should the way to express their return types be.
 
 template <class T> struct access_traits {
   typedef const T& const_type;
   typedef T& non_const_type;
 
   typedef const typename boost::remove_cv<T>::type& parameter_type;
 
 // used as the tuple constructors parameter types
 // Rationale: non-reference tuple element types can be cv-qualified.
 // It should be possible to initialize such types with temporaries,
 // and when binding temporaries to references, the reference must
 // be non-volatile and const. 8.5.3. (5)
 };
 
 template <class T> struct access_traits<T&> {
 
   typedef T& const_type;
   typedef T& non_const_type;
 
   typedef T& parameter_type;
 };
 
 // get function for non-const cons-lists, returns a reference to the element
 
 template<std::size_t N, class HT, class TT>
 inline typename access_traits<
                   typename element<N, cons<HT, TT> >::type
                 >::non_const_type
 get(cons<HT, TT>& c) {
   typedef BOOST_DEDUCED_TYPENAME detail::drop_front<N>::BOOST_NESTED_TEMPLATE
       apply<cons<HT, TT> > impl;
   typedef BOOST_DEDUCED_TYPENAME impl::type cons_element;
   return const_cast<cons_element&>(impl::call(c)).head;
 }
 
 // get function for const cons-lists, returns a const reference to
 // the element. If the element is a reference, returns the reference
 // as such (that is, can return a non-const reference)
 template<std::size_t N, class HT, class TT>
 inline typename access_traits<
                   typename element<N, cons<HT, TT> >::type
                 >::const_type
 get(const cons<HT, TT>& c) {
   typedef BOOST_DEDUCED_TYPENAME detail::drop_front<N>::BOOST_NESTED_TEMPLATE
       apply<cons<HT, TT> > impl;
   return impl::call(c).head;
 }
 
 // -- the cons template  --------------------------------------------------
 namespace detail {
 
 //  These helper templates wrap void types and plain function types.
 //  The reationale is to allow one to write tuple types with those types
 //  as elements, even though it is not possible to instantiate such object.
 //  E.g: typedef tuple<void> some_type; // ok
 //  but: some_type x; // fails
 
 template <class T> class non_storeable_type {
   non_storeable_type();
 };
 
 template <class T> struct wrap_non_storeable_type {
   typedef typename IF<
     ::boost::is_function<T>::value, non_storeable_type<T>, T
   >::RET type;
 };
 template <> struct wrap_non_storeable_type<void> {
   typedef non_storeable_type<void> type;
 };
 
 } // detail
 
 template <class HT, class TT>
 struct cons {
 
   typedef HT head_type;
   typedef TT tail_type;
 
   typedef typename
     detail::wrap_non_storeable_type<head_type>::type stored_head_type;
 
   stored_head_type head;
   tail_type tail;
 
   typename access_traits<stored_head_type>::non_const_type
   get_head() { return head; }
 
   typename access_traits<tail_type>::non_const_type
   get_tail() { return tail; }
 
   typename access_traits<stored_head_type>::const_type
   get_head() const { return head; }
 
   typename access_traits<tail_type>::const_type
   get_tail() const { return tail; }
 
   cons() : head(), tail() {}
   //  cons() : head(detail::default_arg<HT>::f()), tail() {}
 
   // the argument for head is not strictly needed, but it prevents
   // array type elements. This is good, since array type elements
   // cannot be supported properly in any case (no assignment,
   // copy works only if the tails are exactly the same type, ...)
 
   cons(typename access_traits<stored_head_type>::parameter_type h,
        const tail_type& t)
     : head (h), tail(t) {}
 
   template <class T1, class T2, class T3, class T4, class T5,
             class T6, class T7, class T8, class T9, class T10>
   cons( T1& t1, T2& t2, T3& t3, T4& t4, T5& t5,
         T6& t6, T7& t7, T8& t8, T9& t9, T10& t10 )
     : head (t1),
       tail (t2, t3, t4, t5, t6, t7, t8, t9, t10, detail::cnull())
       {}
 
   template <class T2, class T3, class T4, class T5,
             class T6, class T7, class T8, class T9, class T10>
   cons( const null_type& /*t1*/, T2& t2, T3& t3, T4& t4, T5& t5,
         T6& t6, T7& t7, T8& t8, T9& t9, T10& t10 )
     : head (),
       tail (t2, t3, t4, t5, t6, t7, t8, t9, t10, detail::cnull())
       {}
 
   cons( const cons& u ) : head(u.head), tail(u.tail) {}
 
   template <class HT2, class TT2>
   cons( const cons<HT2, TT2>& u ) : head(u.head), tail(u.tail) {}
 
   template <class HT2, class TT2>
   cons& operator=( const cons<HT2, TT2>& u ) {
     head=u.head; tail=u.tail; return *this;
   }
 
   // must define assignment operator explicitly, implicit version is
   // illformed if HT is a reference (12.8. (12))
   cons& operator=(const cons& u) {
     head = u.head; tail = u.tail;  return *this;
   }
 
   template <class T1, class T2>
   cons& operator=( const std::pair<T1, T2>& u ) {
     BOOST_STATIC_ASSERT(length<cons>::value == 2); // check length = 2
     head = u.first; tail.head = u.second; return *this;
   }
 
   // get member functions (non-const and const)
   template <std::size_t N>
   typename access_traits<
              typename element<N, cons<HT, TT> >::type
            >::non_const_type
   get() {
     return boost::tuples::get<N>(*this); // delegate to non-member get
   }
 
   template <std::size_t N>
   typename access_traits<
              typename element<N, cons<HT, TT> >::type
            >::const_type
   get() const {
     return boost::tuples::get<N>(*this); // delegate to non-member get
   }
 };
 
 template <class HT>
 struct cons<HT, null_type> {
 
   typedef HT head_type;
   typedef null_type tail_type;
   typedef cons<HT, null_type> self_type;
 
   typedef typename
     detail::wrap_non_storeable_type<head_type>::type stored_head_type;
   stored_head_type head;
 
   typename access_traits<stored_head_type>::non_const_type
   get_head() { return head; }
 
   null_type get_tail() { return null_type(); }
 
   typename access_traits<stored_head_type>::const_type
   get_head() const { return head; }
 
   const null_type get_tail() const { return null_type(); }
 
   //  cons() : head(detail::default_arg<HT>::f()) {}
   cons() : head() {}
 
   cons(typename access_traits<stored_head_type>::parameter_type h,
        const null_type& = null_type())
     : head (h) {}
 
   template<class T1>
   cons(T1& t1, const null_type&, const null_type&, const null_type&,
        const null_type&, const null_type&, const null_type&,
        const null_type&, const null_type&, const null_type&)
   : head (t1) {}
 
   cons(const null_type&,
        const null_type&, const null_type&, const null_type&,
        const null_type&, const null_type&, const null_type&,
        const null_type&, const null_type&, const null_type&)
   : head () {}
 
   cons( const cons& u ) : head(u.head) {}
 
   template <class HT2>
   cons( const cons<HT2, null_type>& u ) : head(u.head) {}
 
   template <class HT2>
   cons& operator=(const cons<HT2, null_type>& u )
   { head = u.head; return *this; }
 
   // must define assignment operator explicitely, implicit version
   // is illformed if HT is a reference
   cons& operator=(const cons& u) { head = u.head; return *this; }
 
   template <std::size_t N>
   typename access_traits<
              typename element<N, self_type>::type
             >::non_const_type
   get() {
     return boost::tuples::get<N>(*this);
   }
 
   template <std::size_t N>
   typename access_traits<
              typename element<N, self_type>::type
            >::const_type
   get() const {
     return boost::tuples::get<N>(*this);
   }
 
 };
 
 // templates for finding out the length of the tuple -------------------
 
 template<class T>
 struct length: boost::integral_constant<std::size_t, 1 + length<typename T::tail_type>::value>
 {
 };
 
 template<>
 struct length<tuple<> >: boost::integral_constant<std::size_t, 0>
 {
 };
 
 template<>
 struct length<tuple<> const>: boost::integral_constant<std::size_t, 0>
 {
 };
 
 template<>
 struct length<null_type>: boost::integral_constant<std::size_t, 0>
 {
 };
 
 template<>
 struct length<null_type const>: boost::integral_constant<std::size_t, 0>
 {
 };
 
 namespace detail {
 
 // Tuple to cons mapper --------------------------------------------------
 template <class T0, class T1, class T2, class T3, class T4,
           class T5, class T6, class T7, class T8, class T9>
 struct map_tuple_to_cons
 {
   typedef cons<T0,
                typename map_tuple_to_cons<T1, T2, T3, T4, T5,
                                           T6, T7, T8, T9, null_type>::type
               > type;
 };
 
 // The empty tuple is a null_type
 template <>
 struct map_tuple_to_cons<null_type, null_type, null_type, null_type, null_type, null_type, null_type, null_type, null_type, null_type>
 {
   typedef null_type type;
 };
 
 } // end detail
 
 // -------------------------------------------------------------------
 // -- tuple ------------------------------------------------------
 template <class T0, class T1, class T2, class T3, class T4,
           class T5, class T6, class T7, class T8, class T9>
 
 class tuple :
   public detail::map_tuple_to_cons<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::type
 {
 public:
   typedef typename
     detail::map_tuple_to_cons<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::type inherited;
   typedef typename inherited::head_type head_type;
   typedef typename inherited::tail_type tail_type;
 
 
 // access_traits<T>::parameter_type takes non-reference types as const T&
   tuple() {}
 
   explicit tuple(typename access_traits<T0>::parameter_type t0)
     : inherited(t0, detail::cnull(), detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1)
     : inherited(t0, t1, detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2)
     : inherited(t0, t1, t2, detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3)
     : inherited(t0, t1, t2, t3, detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull(),
                 detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3,
         typename access_traits<T4>::parameter_type t4)
     : inherited(t0, t1, t2, t3, t4, detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull(), detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3,
         typename access_traits<T4>::parameter_type t4,
         typename access_traits<T5>::parameter_type t5)
     : inherited(t0, t1, t2, t3, t4, t5, detail::cnull(), detail::cnull(),
                 detail::cnull(), detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3,
         typename access_traits<T4>::parameter_type t4,
         typename access_traits<T5>::parameter_type t5,
         typename access_traits<T6>::parameter_type t6)
     : inherited(t0, t1, t2, t3, t4, t5, t6, detail::cnull(),
                 detail::cnull(), detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3,
         typename access_traits<T4>::parameter_type t4,
         typename access_traits<T5>::parameter_type t5,
         typename access_traits<T6>::parameter_type t6,
         typename access_traits<T7>::parameter_type t7)
     : inherited(t0, t1, t2, t3, t4, t5, t6, t7, detail::cnull(),
                 detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3,
         typename access_traits<T4>::parameter_type t4,
         typename access_traits<T5>::parameter_type t5,
         typename access_traits<T6>::parameter_type t6,
         typename access_traits<T7>::parameter_type t7,
         typename access_traits<T8>::parameter_type t8)
     : inherited(t0, t1, t2, t3, t4, t5, t6, t7, t8, detail::cnull()) {}
 
   tuple(typename access_traits<T0>::parameter_type t0,
         typename access_traits<T1>::parameter_type t1,
         typename access_traits<T2>::parameter_type t2,
         typename access_traits<T3>::parameter_type t3,
         typename access_traits<T4>::parameter_type t4,
         typename access_traits<T5>::parameter_type t5,
         typename access_traits<T6>::parameter_type t6,
         typename access_traits<T7>::parameter_type t7,
         typename access_traits<T8>::parameter_type t8,
         typename access_traits<T9>::parameter_type t9)
     : inherited(t0, t1, t2, t3, t4, t5, t6, t7, t8, t9) {}
 
 
   template<class U1, class U2>
   tuple(const cons<U1, U2>& p) : inherited(p) {}
 
   template <class U1, class U2>
   tuple& operator=(const cons<U1, U2>& k) {
     inherited::operator=(k);
     return *this;
   }
 
   template <class U1, class U2>
   tuple& operator=(const std::pair<U1, U2>& k) {
     BOOST_STATIC_ASSERT(length<tuple>::value == 2);// check_length = 2
     this->head = k.first;
     this->tail.head = k.second;
     return *this;
   }
 
 };
 
 // The empty tuple
 template <>
 class tuple<null_type, null_type, null_type, null_type, null_type, null_type, null_type, null_type, null_type, null_type>  :
   public null_type
 {
 public:
   typedef null_type inherited;
 };
 
 
 // Swallows any assignment   (by Doug Gregor)
 namespace detail {
 
 struct swallow_assign;
 typedef void (detail::swallow_assign::*ignore_t)();
 struct swallow_assign {
   swallow_assign(ignore_t(*)(ignore_t)) {}
   template<typename T>
   swallow_assign const& operator=(const T&) const {
     return *this;
   }
 };
 
 
 } // namespace detail
 
 // "ignore" allows tuple positions to be ignored when using "tie".
 inline detail::ignore_t ignore(detail::ignore_t) { return 0; }
 
 // ---------------------------------------------------------------------------
 // The call_traits for make_tuple
 // Honours the reference_wrapper class.
 
 // Must be instantiated with plain or const plain types (not with references)
 
 // from template<class T> foo(const T& t) : make_tuple_traits<const T>::type
 // from template<class T> foo(T& t) : make_tuple_traits<T>::type
 
 // Conversions:
 // T -> T,
 // references -> compile_time_error
 // reference_wrapper<T> -> T&
 // const reference_wrapper<T> -> T&
 // array -> const ref array
 
 
 template<class T>
 struct make_tuple_traits {
   typedef T type;
 
   // commented away, see below  (JJ)
   //  typedef typename IF<
   //  boost::is_function<T>::value,
   //  T&,
   //  T>::RET type;
 
 };
 
 // The is_function test was there originally for plain function types,
 // which can't be stored as such (we must either store them as references or
 // pointers). Such a type could be formed if make_tuple was called with a
 // reference to a function.
 // But this would mean that a const qualified function type was formed in
 // the make_tuple function and hence make_tuple can't take a function
 // reference as a parameter, and thus T can't be a function type.
 // So is_function test was removed.
 // (14.8.3. says that type deduction fails if a cv-qualified function type
 // is created. (It only applies for the case of explicitly specifying template
 // args, though?)) (JJ)
 
 template<class T>
 struct make_tuple_traits<T&> {
   typedef typename
      detail::generate_error<T&>::
        do_not_use_with_reference_type error;
 };
 
 // Arrays can't be stored as plain types; convert them to references.
 // All arrays are converted to const. This is because make_tuple takes its
 // parameters as const T& and thus the knowledge of the potential
 // non-constness of actual argument is lost.
 template<class T, std::size_t n>  struct make_tuple_traits <T[n]> {
   typedef const T (&type)[n];
 };
 
 template<class T, std::size_t n>
 struct make_tuple_traits<const T[n]> {
   typedef const T (&type)[n];
 };
 
 template<class T, std::size_t n>  struct make_tuple_traits<volatile T[n]> {
   typedef const volatile T (&type)[n];
 };
 
 template<class T, std::size_t n>
 struct make_tuple_traits<const volatile T[n]> {
   typedef const volatile T (&type)[n];
 };
 
 template<class T>
 struct make_tuple_traits<reference_wrapper<T> >{
   typedef T& type;
 };
 
 template<class T>
 struct make_tuple_traits<const reference_wrapper<T> >{
   typedef T& type;
 };
 
 template<>
 struct make_tuple_traits<detail::ignore_t(detail::ignore_t)> {
   typedef detail::swallow_assign type;
 };
 
 
 
 namespace detail {
 
 // a helper traits to make the make_tuple functions shorter (Vesa Karvonen's
 // suggestion)
 template <
   class T0 = null_type, class T1 = null_type, class T2 = null_type,
   class T3 = null_type, class T4 = null_type, class T5 = null_type,
   class T6 = null_type, class T7 = null_type, class T8 = null_type,
   class T9 = null_type
 >
 struct make_tuple_mapper {
   typedef
     tuple<typename make_tuple_traits<T0>::type,
           typename make_tuple_traits<T1>::type,
           typename make_tuple_traits<T2>::type,
           typename make_tuple_traits<T3>::type,
           typename make_tuple_traits<T4>::type,
           typename make_tuple_traits<T5>::type,
           typename make_tuple_traits<T6>::type,
           typename make_tuple_traits<T7>::type,
           typename make_tuple_traits<T8>::type,
           typename make_tuple_traits<T9>::type> type;
 };
 
 } // end detail
 
 // -make_tuple function templates -----------------------------------
 inline tuple<> make_tuple() {
   return tuple<>();
 }
 
 template<class T0>
 inline typename detail::make_tuple_mapper<T0>::type
 make_tuple(const T0& t0) {
   typedef typename detail::make_tuple_mapper<T0>::type t;
   return t(t0);
 }
 
 template<class T0, class T1>
 inline typename detail::make_tuple_mapper<T0, T1>::type
 make_tuple(const T0& t0, const T1& t1) {
   typedef typename detail::make_tuple_mapper<T0, T1>::type t;
   return t(t0, t1);
 }
 
 template<class T0, class T1, class T2>
 inline typename detail::make_tuple_mapper<T0, T1, T2>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2) {
   typedef typename detail::make_tuple_mapper<T0, T1, T2>::type t;
   return t(t0, t1, t2);
 }
 
 template<class T0, class T1, class T2, class T3>
 inline typename detail::make_tuple_mapper<T0, T1, T2, T3>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3) {
   typedef typename detail::make_tuple_mapper<T0, T1, T2, T3>::type t;
   return t(t0, t1, t2, t3);
 }
 
 template<class T0, class T1, class T2, class T3, class T4>
 inline typename detail::make_tuple_mapper<T0, T1, T2, T3, T4>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3,
                   const T4& t4) {
   typedef typename detail::make_tuple_mapper<T0, T1, T2, T3, T4>::type t;
   return t(t0, t1, t2, t3, t4);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5>
 inline typename detail::make_tuple_mapper<T0, T1, T2, T3, T4, T5>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3,
                   const T4& t4, const T5& t5) {
   typedef typename detail::make_tuple_mapper<T0, T1, T2, T3, T4, T5>::type t;
   return t(t0, t1, t2, t3, t4, t5);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6>
 inline typename detail::make_tuple_mapper<T0, T1, T2, T3, T4, T5, T6>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3,
                   const T4& t4, const T5& t5, const T6& t6) {
   typedef typename detail::make_tuple_mapper
            <T0, T1, T2, T3, T4, T5, T6>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6,
          class T7>
 inline typename detail::make_tuple_mapper<T0, T1, T2, T3, T4, T5, T6, T7>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3,
                   const T4& t4, const T5& t5, const T6& t6, const T7& t7) {
   typedef typename detail::make_tuple_mapper
            <T0, T1, T2, T3, T4, T5, T6, T7>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6, t7);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6,
          class T7, class T8>
 inline typename detail::make_tuple_mapper
   <T0, T1, T2, T3, T4, T5, T6, T7, T8>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3,
                   const T4& t4, const T5& t5, const T6& t6, const T7& t7,
                   const T8& t8) {
   typedef typename detail::make_tuple_mapper
            <T0, T1, T2, T3, T4, T5, T6, T7, T8>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6, t7, t8);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6,
          class T7, class T8, class T9>
 inline typename detail::make_tuple_mapper
   <T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::type
 make_tuple(const T0& t0, const T1& t1, const T2& t2, const T3& t3,
                   const T4& t4, const T5& t5, const T6& t6, const T7& t7,
                   const T8& t8, const T9& t9) {
   typedef typename detail::make_tuple_mapper
            <T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6, t7, t8, t9);
 }
 
 namespace detail {
 
 template<class T>
 struct tie_traits {
   typedef T& type;
 };
 
 template<>
 struct tie_traits<ignore_t(ignore_t)> {
   typedef swallow_assign type;
 };
 
 template<>
 struct tie_traits<void> {
   typedef null_type type;
 };
 
 template <
   class T0 = void, class T1 = void, class T2 = void,
   class T3 = void, class T4 = void, class T5 = void,
   class T6 = void, class T7 = void, class T8 = void,
   class T9 = void
 >
 struct tie_mapper {
   typedef
     tuple<typename tie_traits<T0>::type,
           typename tie_traits<T1>::type,
           typename tie_traits<T2>::type,
           typename tie_traits<T3>::type,
           typename tie_traits<T4>::type,
           typename tie_traits<T5>::type,
           typename tie_traits<T6>::type,
           typename tie_traits<T7>::type,
           typename tie_traits<T8>::type,
           typename tie_traits<T9>::type> type;
 };
 
 }
 
 // Tie function templates -------------------------------------------------
 template<class T0>
 inline typename detail::tie_mapper<T0>::type
 tie(T0& t0) {
   typedef typename detail::tie_mapper<T0>::type t;
   return t(t0);
 }
 
 template<class T0, class T1>
 inline typename detail::tie_mapper<T0, T1>::type
 tie(T0& t0, T1& t1) {
   typedef typename detail::tie_mapper<T0, T1>::type t;
   return t(t0, t1);
 }
 
 template<class T0, class T1, class T2>
 inline typename detail::tie_mapper<T0, T1, T2>::type
 tie(T0& t0, T1& t1, T2& t2) {
   typedef typename detail::tie_mapper<T0, T1, T2>::type t;
   return t(t0, t1, t2);
 }
 
 template<class T0, class T1, class T2, class T3>
 inline typename detail::tie_mapper<T0, T1, T2, T3>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3) {
   typedef typename detail::tie_mapper<T0, T1, T2, T3>::type t;
   return t(t0, t1, t2, t3);
 }
 
 template<class T0, class T1, class T2, class T3, class T4>
 inline typename detail::tie_mapper<T0, T1, T2, T3, T4>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3,
                   T4& t4) {
   typedef typename detail::tie_mapper<T0, T1, T2, T3, T4>::type t;
   return t(t0, t1, t2, t3, t4);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5>
 inline typename detail::tie_mapper<T0, T1, T2, T3, T4, T5>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3,
                   T4& t4, T5& t5) {
   typedef typename detail::tie_mapper<T0, T1, T2, T3, T4, T5>::type t;
   return t(t0, t1, t2, t3, t4, t5);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6>
 inline typename detail::tie_mapper<T0, T1, T2, T3, T4, T5, T6>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3,
                   T4& t4, T5& t5, T6& t6) {
   typedef typename detail::tie_mapper
            <T0, T1, T2, T3, T4, T5, T6>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6,
          class T7>
 inline typename detail::tie_mapper<T0, T1, T2, T3, T4, T5, T6, T7>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3,
                   T4& t4, T5& t5, T6& t6, T7& t7) {
   typedef typename detail::tie_mapper
            <T0, T1, T2, T3, T4, T5, T6, T7>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6, t7);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6,
          class T7, class T8>
 inline typename detail::tie_mapper
   <T0, T1, T2, T3, T4, T5, T6, T7, T8>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3,
                   T4& t4, T5& t5, T6& t6, T7& t7,
                   T8& t8) {
   typedef typename detail::tie_mapper
            <T0, T1, T2, T3, T4, T5, T6, T7, T8>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6, t7, t8);
 }
 
 template<class T0, class T1, class T2, class T3, class T4, class T5, class T6,
          class T7, class T8, class T9>
 inline typename detail::tie_mapper
   <T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::type
 tie(T0& t0, T1& t1, T2& t2, T3& t3,
                   T4& t4, T5& t5, T6& t6, T7& t7,
                   T8& t8, T9& t9) {
   typedef typename detail::tie_mapper
            <T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>::type t;
   return t(t0, t1, t2, t3, t4, t5, t6, t7, t8, t9);
 }
 
 template <class T0, class T1, class T2, class T3, class T4,
           class T5, class T6, class T7, class T8, class T9>
 void swap(tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>& lhs,
           tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>& rhs);
 inline void swap(null_type&, null_type&) {}
 template<class HH>
 inline void swap(cons<HH, null_type>& lhs, cons<HH, null_type>& rhs) {
   ::boost::core::invoke_swap(lhs.head, rhs.head);
 }
 template<class HH, class TT>
 inline void swap(cons<HH, TT>& lhs, cons<HH, TT>& rhs) {
   ::boost::core::invoke_swap(lhs.head, rhs.head);
   ::boost::tuples::swap(lhs.tail, rhs.tail);
 }
 template <class T0, class T1, class T2, class T3, class T4,
           class T5, class T6, class T7, class T8, class T9>
 inline void swap(tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>& lhs,
           tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>& rhs) {
   typedef tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> tuple_type;
   typedef typename tuple_type::inherited base;
   ::boost::tuples::swap(static_cast<base&>(lhs), static_cast<base&>(rhs));
 }
 
 } // end of namespace tuples
 } // end of namespace boost
 
 
 #if defined(BOOST_GCC) && (BOOST_GCC >= 40700)
 #pragma GCC diagnostic pop
 #endif
 
 
 #endif // BOOST_TUPLE_BASIC_HPP

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