//  tuple_basic.hpp -----------------------------------------------------

 // Copyright (C) 1999, 2000 Jaakko Järvi (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 "boost/type_traits/cv_traits.hpp"

 #include "boost/type_traits/function_traits.hpp"

 #include "boost/detail/workaround.hpp" // needed for BOOST_WORKAROUND

 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;

 // - cons getters --------------------------------------------------------

 // called: get_class<N>::get<RETURN_TYPE>(aTuple)

 template< int N >

 struct get_class {

   template<class RET, class HT, class TT >

   inline static RET get(const cons<HT, TT>& t)

   {

 #if BOOST_WORKAROUND(__IBMCPP__,==600)

     // vacpp 6.0 is not very consistent regarding the member template keyword

     // Here it generates an error when the template keyword is used.

     return get_class<N-1>::get<RET>(t.tail);

 #else

     return get_class<N-1>::BOOST_NESTED_TEMPLATE get<RET>(t.tail);

 #endif

   }

   template<class RET, class HT, class TT >

   inline static RET get(cons<HT, TT>& t)

   {

 #if BOOST_WORKAROUND(__IBMCPP__,==600)

     return get_class<N-1>::get<RET>(t.tail);

 #else

     return get_class<N-1>::BOOST_NESTED_TEMPLATE get<RET>(t.tail);

 #endif

   }

 };

 template<>

 struct get_class<0> {

   template<class RET, class HT, class TT>

   inline static RET get(const cons<HT, TT>& t)

   {

     return t.head;

   }

   template<class RET, class HT, class TT>

   inline static RET get(cons<HT, TT>& t)

   {

     return t.head;

   }

 };

 } // 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<int N, class T>

 struct element

 {

 private:

   typedef typename T::tail_type Next;

 public:

   typedef typename element<N-1, Next>::type type;

 };

 template<class T>

 struct element<0,T>

 {

   typedef typename T::head_type type;

 };

 template<int N, class T>

 struct element<N, const T>

 {

 private:

   typedef typename T::tail_type Next;

   typedef typename element<N-1, Next>::type unqualified_type;

 public:

 #if BOOST_WORKAROUND(__BORLANDC__,<0x600)

   typedef const unqualified_type type;

 #else

   typedef typename boost::add_const<unqualified_type>::type type;

 #endif

 };

 template<class T>

 struct element<0,const T>

 {

 #if BOOST_WORKAROUND(__BORLANDC__,<0x600)

   typedef const typename T::head_type type;

 #else

   typedef typename boost::add_const<typename T::head_type>::type type;

 #endif

 };

 #else // def BOOST_NO_CV_SPECIALIZATIONS

 namespace detail {

 template<int N, class T, bool IsConst>

 struct element_impl

 {

 private:

   typedef typename T::tail_type Next;

 public:

   typedef typename element_impl<N-1, Next, IsConst>::type type;

 };

 template<int N, class T>

 struct element_impl<N, T, true /* IsConst */>

 {

 private:

   typedef typename T::tail_type Next;

 public:

   typedef const typename element_impl<N-1, Next, true>::type type;

 };

 template<class T>

 struct element_impl<0, T, false /* IsConst */>

 {

   typedef typename T::head_type type;

 };

 template<class T>

 struct element_impl<0, T, true /* IsConst */>

 {

   typedef const typename T::head_type type;

 };

 } // end of namespace detail

 template<int 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<int N, class HT, class TT>

 inline typename access_traits<

                   typename element<N, cons<HT, TT> >::type

                 >::non_const_type

 get(cons<HT, TT>& c BOOST_APPEND_EXPLICIT_TEMPLATE_NON_TYPE(int, N)) {

 #if BOOST_WORKAROUND(__IBMCPP__,==600 )

   return detail::get_class<N>::

 #else

   return detail::get_class<N>::BOOST_NESTED_TEMPLATE

 #endif

          get<

            typename access_traits<

              typename element<N, cons<HT, TT> >::type

            >::non_const_type,

            HT,TT

          >(c);

 }

 // 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<int N, class HT, class TT>

 inline typename access_traits<

                   typename element<N, cons<HT, TT> >::type

                 >::const_type

 get(const cons<HT, TT>& c BOOST_APPEND_EXPLICIT_TEMPLATE_NON_TYPE(int, N)) {

 #if BOOST_WORKAROUND(__IBMCPP__,==600)

   return detail::get_class<N>::

 #else

   return detail::get_class<N>::BOOST_NESTED_TEMPLATE

 #endif

          get<

            typename access_traits<

              typename element<N, cons<HT, TT> >::type

            >::const_type,

            HT,TT

          >(c);

 }

 // -- 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())

       {}

   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 <int 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 <int 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 () {}

   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 <int N>

   typename access_traits<

              typename element<N, self_type>::type

             >::non_const_type

   get(BOOST_EXPLICIT_TEMPLATE_NON_TYPE(int, N)) {

     return boost::tuples::get<N>(*this);

   }

   template <int N>

   typename access_traits<

              typename element<N, self_type>::type

            >::const_type

   get(BOOST_EXPLICIT_TEMPLATE_NON_TYPE(int, N)) const {

     return boost::tuples::get<N>(*this);

   }

 };

 // templates for finding out the length of the tuple -------------------

 template<class T>

 struct length  {

   BOOST_STATIC_CONSTANT(int, value = 1 + length<typename T::tail_type>::value);

 };

 template<>

 struct length<tuple<> > {

   BOOST_STATIC_CONSTANT(int, value = 0);

 };

 template<>

 struct length<null_type> {

   BOOST_STATIC_CONSTANT(int, value = 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() {}

   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 {

   template<typename T>

   swallow_assign const& operator=(const T&) const {

     return *this;

   }

 };

 } // namespace detail

 // "ignore" allows tuple positions to be ignored when using "tie".

 detail::swallow_assign const ignore = detail::swallow_assign();

 // ---------------------------------------------------------------------------

 // 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, int n>  struct make_tuple_traits <T[n]> {

   typedef const T (&type)[n];

 };

 template<class T, int n>

 struct make_tuple_traits<const T[n]> {

   typedef const T (&type)[n];

 };

 template<class T, int n>  struct make_tuple_traits<volatile T[n]> {

   typedef const volatile T (&type)[n];

 };

 template<class T, int 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;

 };

 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);

 }

 // Tie function templates -------------------------------------------------

 template<class T1>

 inline tuple<T1&> tie(T1& t1) {

   return tuple<T1&> (t1);

 }

 template<class T1, class T2>

 inline tuple<T1&, T2&> tie(T1& t1, T2& t2) {

   return tuple<T1&, T2&> (t1, t2);

 }

 template<class T1, class T2, class T3>

 inline tuple<T1&, T2&, T3&> tie(T1& t1, T2& t2, T3& t3) {

   return tuple<T1&, T2&, T3&> (t1, t2, t3);

 }

 template<class T1, class T2, class T3, class T4>

 inline tuple<T1&, T2&, T3&, T4&> tie(T1& t1, T2& t2, T3& t3, T4& t4) {

   return tuple<T1&, T2&, T3&, T4&> (t1, t2, t3, t4);

 }

 template<class T1, class T2, class T3, class T4, class T5>

 inline tuple<T1&, T2&, T3&, T4&, T5&>

 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5) {

   return tuple<T1&, T2&, T3&, T4&, T5&> (t1, t2, t3, t4, t5);

 }

 template<class T1, class T2, class T3, class T4, class T5, class T6>

 inline tuple<T1&, T2&, T3&, T4&, T5&, T6&>

 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5, T6& t6) {

   return tuple<T1&, T2&, T3&, T4&, T5&, T6&> (t1, t2, t3, t4, t5, t6);

 }

 template<class T1, class T2, class T3, class T4, class T5, class T6, class T7>

 inline tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&>

 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5, T6& t6, T7& t7) {

   return tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&> (t1, t2, t3, t4, t5, t6, t7);

 }

 template<class T1, class T2, class T3, class T4, class T5, class T6, class T7,

          class T8>

 inline tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&, T8&>

 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5, T6& t6, T7& t7, T8& t8) {

   return tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&, T8&>

            (t1, t2, t3, t4, t5, t6, t7, t8);

 }

 template<class T1, class T2, class T3, class T4, class T5, class T6, class T7,

          class T8, class T9>

 inline tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&, T8&, T9&>

 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5, T6& t6, T7& t7, T8& t8,

            T9& t9) {

   return tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&, T8&, T9&>

             (t1, t2, t3, t4, t5, t6, t7, t8, t9);

 }

 template<class T1, class T2, class T3, class T4, class T5, class T6, class T7,

          class T8, class T9, class T10>

 inline tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&, T8&, T9&, T10&>

 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5& t5, T6& t6, T7& t7, T8& t8,

            T9& t9, T10& t10) {

   return tuple<T1&, T2&, T3&, T4&, T5&, T6&, T7&, T8&, T9&, T10&>

            (t1, t2, t3, t4, t5, t6, t7, t8, t9, t10);

 }

 } // end of namespace tuples

 } // end of namespace boost

 #endif // BOOST_TUPLE_BASIC_HPP