early-access version 3088

externals/vcpkg/packages/boost-tuple_x64-windows/include/boost/tuple/detail/tuple_basic.hpp

@@ -0,0 +1,992 @@
+//  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/type_traits/cv_traits.hpp>
+#include <boost/type_traits/function_traits.hpp>
+#include <boost/type_traits/integral_constant.hpp>
+#include <boost/utility/swap.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::swap(lhs.head, rhs.head);
+}
+template<class HH, class TT>
+inline void swap(cons<HH, TT>& lhs, cons<HH, TT>& rhs) {
+  ::boost::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

externals/vcpkg/packages/boost-tuple_x64-windows/include/boost/tuple/tuple.hpp

@@ -0,0 +1,118 @@
+//  tuple.hpp - Boost Tuple Library --------------------------------------
+
+// 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
+
+// -----------------------------------------------------------------
+
+#ifndef BOOST_TUPLE_HPP
+#define BOOST_TUPLE_HPP
+
+#if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730
+// Work around a compiler bug.
+// boost::python::tuple has to be seen by the compiler before the
+// boost::tuple class template.
+namespace boost { namespace python { class tuple; }}
+#endif
+
+#include <boost/config.hpp>
+#include <boost/static_assert.hpp>
+
+// other compilers
+#include <boost/ref.hpp>
+#include <boost/tuple/detail/tuple_basic.hpp>
+
+
+namespace boost {
+
+using tuples::tuple;
+using tuples::make_tuple;
+using tuples::tie;
+#if !defined(BOOST_NO_USING_TEMPLATE)
+using tuples::get;
+#else
+//
+// The "using tuples::get" statement causes the
+// Borland compiler to ICE, use forwarding
+// functions instead:
+//
+template<int N, class HT, class TT>
+inline typename tuples::access_traits<
+                  typename tuples::element<N, tuples::cons<HT, TT> >::type
+                >::non_const_type
+get(tuples::cons<HT, TT>& c) {
+  return tuples::get<N,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 tuples::access_traits<
+                  typename tuples::element<N, tuples::cons<HT, TT> >::type
+                >::const_type
+get(const tuples::cons<HT, TT>& c) {
+  return tuples::get<N,HT,TT>(c);
+}
+
+#endif // BOOST_NO_USING_TEMPLATE
+
+} // end namespace boost
+
+#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
+
+#include <tuple>
+#include <cstddef>
+
+namespace std
+{
+
+#if defined(BOOST_CLANG)
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wmismatched-tags"
+#endif
+
+// std::tuple_size
+
+template<class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10>
+    class tuple_size< boost::tuples::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> >:
+        public boost::tuples::length< boost::tuples::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> >
+{
+};
+
+template<class H, class T> class tuple_size< boost::tuples::cons<H, T> >:
+    public boost::tuples::length< boost::tuples::cons<H, T> >
+{
+};
+
+template<> class tuple_size< boost::tuples::null_type >:
+    public boost::tuples::length< boost::tuples::null_type >
+{
+};
+
+// std::tuple_element
+
+template<std::size_t I, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10>
+    class tuple_element< I, boost::tuples::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> >:
+        public boost::tuples::element< I, boost::tuples::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> >
+{
+};
+
+template<std::size_t I, class H, class T> class tuple_element< I, boost::tuples::cons<H, T> >:
+    public boost::tuples::element< I, boost::tuples::cons<H, T> >
+{
+};
+
+#if defined(BOOST_CLANG)
+# pragma clang diagnostic pop
+#endif
+
+} // namespace std
+
+#endif // !defined(BOOST_NO_CXX11_HDR_TUPLE)
+
+#endif // BOOST_TUPLE_HPP

externals/vcpkg/packages/boost-tuple_x64-windows/include/boost/tuple/tuple_comparison.hpp

@@ -0,0 +1,175 @@
+// tuple_comparison.hpp -----------------------------------------------------
+//
+// Copyright (C) 2001 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
+// Copyright (C) 2001 Gary Powell (gary.powell@sierra.com)
+//
+// 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
+//
+// (The idea and first impl. of comparison operators was from Doug Gregor)
+
+// -----------------------------------------------------------------
+
+#ifndef BOOST_TUPLE_COMPARISON_HPP
+#define BOOST_TUPLE_COMPARISON_HPP
+
+#include <boost/tuple/tuple.hpp>
+
+// -------------------------------------------------------------
+// equality and comparison operators
+//
+// == and != compare tuples elementwise
+// <, >, <= and >= use lexicographical ordering
+//
+// Any operator between tuples of different length fails at compile time
+// No dependencies between operators are assumed
+// (i.e. !(a<b)  does not imply a>=b, a!=b does not imply a==b etc.
+// so any weirdnesses of elementary operators are respected).
+//
+// -------------------------------------------------------------
+
+
+namespace boost {
+namespace tuples {
+
+inline bool operator==(const null_type&, const null_type&) { return true; }
+inline bool operator>=(const null_type&, const null_type&) { return true; }
+inline bool operator<=(const null_type&, const null_type&) { return true; }
+inline bool operator!=(const null_type&, const null_type&) { return false; }
+inline bool operator<(const null_type&, const null_type&) { return false; }
+inline bool operator>(const null_type&, const null_type&) { return false; }
+
+
+namespace detail {
+  // comparison operators check statically the length of its operands and
+  // delegate the comparing task to the following functions. Hence
+  // the static check is only made once (should help the compiler).
+  // These functions assume tuples to be of the same length.
+
+
+template<class T1, class T2>
+inline bool eq(const T1& lhs, const T2& rhs) {
+  return lhs.get_head() == rhs.get_head() &&
+         eq(lhs.get_tail(), rhs.get_tail());
+}
+template<>
+inline bool eq<null_type,null_type>(const null_type&, const null_type&) { return true; }
+
+template<class T1, class T2>
+inline bool neq(const T1& lhs, const T2& rhs) {
+  return lhs.get_head() != rhs.get_head()  ||
+         neq(lhs.get_tail(), rhs.get_tail());
+}
+template<>
+inline bool neq<null_type,null_type>(const null_type&, const null_type&) { return false; }
+
+template<class T1, class T2>
+inline bool lt(const T1& lhs, const T2& rhs) {
+  return lhs.get_head() < rhs.get_head()  ||
+          ( !(rhs.get_head() < lhs.get_head()) &&
+            lt(lhs.get_tail(), rhs.get_tail()));
+}
+template<>
+inline bool lt<null_type,null_type>(const null_type&, const null_type&) { return false; }
+
+template<class T1, class T2>
+inline bool gt(const T1& lhs, const T2& rhs) {
+  return lhs.get_head() > rhs.get_head()  ||
+          ( !(rhs.get_head() > lhs.get_head()) &&
+            gt(lhs.get_tail(), rhs.get_tail()));
+}
+template<>
+inline bool gt<null_type,null_type>(const null_type&, const null_type&) { return false; }
+
+template<class T1, class T2>
+inline bool lte(const T1& lhs, const T2& rhs) {
+  return lhs.get_head() <= rhs.get_head()  &&
+          ( !(rhs.get_head() <= lhs.get_head()) ||
+            lte(lhs.get_tail(), rhs.get_tail()));
+}
+template<>
+inline bool lte<null_type,null_type>(const null_type&, const null_type&) { return true; }
+
+template<class T1, class T2>
+inline bool gte(const T1& lhs, const T2& rhs) {
+  return lhs.get_head() >= rhs.get_head()  &&
+          ( !(rhs.get_head() >= lhs.get_head()) ||
+            gte(lhs.get_tail(), rhs.get_tail()));
+}
+template<>
+inline bool gte<null_type,null_type>(const null_type&, const null_type&) { return true; }
+
+} // end of namespace detail
+
+
+// equal ----
+
+template<class T1, class T2, class S1, class S2>
+inline bool operator==(const cons<T1, T2>& lhs, const cons<S1, S2>& rhs)
+{
+  // check that tuple lengths are equal
+  BOOST_STATIC_ASSERT(length<T2>::value == length<S2>::value);
+
+  return  detail::eq(lhs, rhs);
+}
+
+// not equal -----
+
+template<class T1, class T2, class S1, class S2>
+inline bool operator!=(const cons<T1, T2>& lhs, const cons<S1, S2>& rhs)
+{
+
+  // check that tuple lengths are equal
+  BOOST_STATIC_ASSERT(length<T2>::value == length<S2>::value);
+
+  return detail::neq(lhs, rhs);
+}
+
+// <
+template<class T1, class T2, class S1, class S2>
+inline bool operator<(const cons<T1, T2>& lhs, const cons<S1, S2>& rhs)
+{
+  // check that tuple lengths are equal
+  BOOST_STATIC_ASSERT(length<T2>::value == length<S2>::value);
+
+  return detail::lt(lhs, rhs);
+}
+
+// >
+template<class T1, class T2, class S1, class S2>
+inline bool operator>(const cons<T1, T2>& lhs, const cons<S1, S2>& rhs)
+{
+  // check that tuple lengths are equal
+  BOOST_STATIC_ASSERT(length<T2>::value == length<S2>::value);
+
+  return detail::gt(lhs, rhs);
+}
+
+// <=
+template<class T1, class T2, class S1, class S2>
+inline bool operator<=(const cons<T1, T2>& lhs, const cons<S1, S2>& rhs)
+{
+  // check that tuple lengths are equal
+  BOOST_STATIC_ASSERT(length<T2>::value == length<S2>::value);
+
+  return detail::lte(lhs, rhs);
+}
+
+// >=
+template<class T1, class T2, class S1, class S2>
+inline bool operator>=(const cons<T1, T2>& lhs, const cons<S1, S2>& rhs)
+{
+  // check that tuple lengths are equal
+  BOOST_STATIC_ASSERT(length<T2>::value == length<S2>::value);
+
+  return detail::gte(lhs, rhs);
+}
+
+} // end of namespace tuples
+} // end of namespace boost
+
+
+#endif // BOOST_TUPLE_COMPARISON_HPP

externals/vcpkg/packages/boost-tuple_x64-windows/include/boost/tuple/tuple_io.hpp

@@ -0,0 +1,339 @@
+// tuple_io.hpp --------------------------------------------------------------
+
+// Copyright (C) 2001 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
+//               2001 Gary Powell (gary.powell@sierra.com)
+//
+// 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
+
+// ----------------------------------------------------------------------------
+
+#ifndef BOOST_TUPLE_IO_HPP
+#define BOOST_TUPLE_IO_HPP
+
+#include <istream>
+#include <ostream>
+
+#include <sstream>
+
+#include <boost/tuple/tuple.hpp>
+
+// This is ugly: one should be using twoargument isspace since whitspace can
+// be locale dependent, in theory at least.
+// not all libraries implement have the two-arg version, so we need to
+// use the one-arg one, which one should get with <cctype> but there seem
+// to be exceptions to this.
+
+#if !defined (BOOST_NO_STD_LOCALE)
+
+#include <locale> // for two-arg isspace
+
+#else
+
+#include <cctype> // for one-arg (old) isspace
+#include <ctype.h> // Metrowerks does not find one-arg isspace from cctype
+
+#endif
+
+namespace boost {
+namespace tuples {
+
+namespace detail {
+
+class format_info {
+public:
+
+   enum manipulator_type { open, close, delimiter };
+   BOOST_STATIC_CONSTANT(int, number_of_manipulators = delimiter + 1);
+private:
+
+   static int get_stream_index (int m)
+   {
+     static const int stream_index[number_of_manipulators]
+        = { std::ios::xalloc(), std::ios::xalloc(), std::ios::xalloc() };
+
+     return stream_index[m];
+   }
+
+   format_info(const format_info&);
+   format_info();
+
+
+public:
+
+   template<class CharType, class CharTrait>
+   static CharType get_manipulator(std::basic_ios<CharType, CharTrait>& i,
+                                   manipulator_type m) {
+     // The manipulators are stored as long.
+     // A valid instanitation of basic_stream allows CharType to be any POD,
+     // hence, the static_cast may fail (it fails if long is not convertible
+     // to CharType
+     CharType c = static_cast<CharType>(i.iword(get_stream_index(m)) );
+     // parentheses and space are the default manipulators
+     if (!c) {
+       switch(m) {
+         case detail::format_info::open :  c = i.widen('('); break;
+         case detail::format_info::close : c = i.widen(')'); break;
+         case detail::format_info::delimiter : c = i.widen(' '); break;
+       }
+     }
+     return c;
+   }
+
+
+   template<class CharType, class CharTrait>
+   static void set_manipulator(std::basic_ios<CharType, CharTrait>& i,
+                               manipulator_type m, CharType c) {
+     // The manipulators are stored as long.
+     // A valid instanitation of basic_stream allows CharType to be any POD,
+     // hence, the static_cast may fail (it fails if CharType is not
+     // convertible long.
+      i.iword(get_stream_index(m)) = static_cast<long>(c);
+   }
+};
+
+} // end of namespace detail
+
+template<class CharType>
+class tuple_manipulator {
+  const detail::format_info::manipulator_type mt;
+  CharType f_c;
+public:
+  explicit tuple_manipulator(detail::format_info::manipulator_type m,
+                             CharType c = CharType())
+     : mt(m), f_c(c) {}
+
+   template<class CharTrait>
+  void set(std::basic_ios<CharType, CharTrait> &io) const {
+     detail::format_info::set_manipulator(io, mt, f_c);
+  }
+};
+
+
+template<class CharType, class CharTrait>
+inline std::basic_ostream<CharType, CharTrait>&
+operator<<(std::basic_ostream<CharType, CharTrait>& o, const tuple_manipulator<CharType>& m) {
+  m.set(o);
+  return o;
+}
+
+template<class CharType, class CharTrait>
+inline std::basic_istream<CharType, CharTrait>&
+operator>>(std::basic_istream<CharType, CharTrait>& i, const tuple_manipulator<CharType>& m) {
+  m.set(i);
+  return i;
+}
+
+
+template<class CharType>
+inline tuple_manipulator<CharType> set_open(const CharType c) {
+   return tuple_manipulator<CharType>(detail::format_info::open, c);
+}
+
+template<class CharType>
+inline tuple_manipulator<CharType> set_close(const CharType c) {
+   return tuple_manipulator<CharType>(detail::format_info::close, c);
+}
+
+template<class CharType>
+inline tuple_manipulator<CharType> set_delimiter(const CharType c) {
+   return tuple_manipulator<CharType>(detail::format_info::delimiter, c);
+}
+
+
+
+
+
+// -------------------------------------------------------------
+// printing tuples to ostream in format (a b c)
+// parentheses and space are defaults, but can be overriden with manipulators
+// set_open, set_close and set_delimiter
+
+namespace detail {
+
+// Note: The order of the print functions is critical
+// to let a conforming compiler  find and select the correct one.
+
+
+template<class CharType, class CharTrait, class T1>
+inline std::basic_ostream<CharType, CharTrait>&
+print(std::basic_ostream<CharType, CharTrait>& o, const cons<T1, null_type>& t) {
+  return o << t.head;
+}
+
+
+template<class CharType, class CharTrait>
+inline std::basic_ostream<CharType, CharTrait>&
+print(std::basic_ostream<CharType, CharTrait>& o, const null_type&) {
+  return o;
+}
+
+template<class CharType, class CharTrait, class T1, class T2>
+inline std::basic_ostream<CharType, CharTrait>&
+print(std::basic_ostream<CharType, CharTrait>& o, const cons<T1, T2>& t) {
+
+  const CharType d = format_info::get_manipulator(o, format_info::delimiter);
+
+  o << t.head;
+
+  o << d;
+
+  return print(o, t.tail);
+}
+
+template<class CharT, class Traits, class T>
+inline bool handle_width(std::basic_ostream<CharT, Traits>& o, const T& t) {
+    std::streamsize width = o.width();
+    if(width == 0) return false;
+
+    std::basic_ostringstream<CharT, Traits> ss;
+
+    ss.copyfmt(o);
+    ss.tie(0);
+    ss.width(0);
+
+    ss << t;
+    o << ss.str();
+
+    return true;
+}
+
+
+} // namespace detail
+
+
+template<class CharType, class CharTrait>
+inline std::basic_ostream<CharType, CharTrait>&
+operator<<(std::basic_ostream<CharType, CharTrait>& o,
+           const null_type& t) {
+  if (!o.good() ) return o;
+  if (detail::handle_width(o, t)) return o;
+
+  const CharType l =
+    detail::format_info::get_manipulator(o, detail::format_info::open);
+  const CharType r =
+    detail::format_info::get_manipulator(o, detail::format_info::close);
+
+  o << l;
+  o << r;
+
+  return o;
+}
+
+template<class CharType, class CharTrait, class T1, class T2>
+inline std::basic_ostream<CharType, CharTrait>&
+operator<<(std::basic_ostream<CharType, CharTrait>& o,
+           const cons<T1, T2>& t) {
+  if (!o.good() ) return o;
+  if (detail::handle_width(o, t)) return o;
+
+  const CharType l =
+    detail::format_info::get_manipulator(o, detail::format_info::open);
+  const CharType r =
+    detail::format_info::get_manipulator(o, detail::format_info::close);
+
+  o << l;
+
+  detail::print(o, t);
+
+  o << r;
+
+  return o;
+}
+
+
+// -------------------------------------------------------------
+// input stream operators
+
+namespace detail {
+
+
+template<class CharType, class CharTrait>
+inline std::basic_istream<CharType, CharTrait>&
+extract_and_check_delimiter(
+  std::basic_istream<CharType, CharTrait> &is, format_info::manipulator_type del)
+{
+  const CharType d = format_info::get_manipulator(is, del);
+
+#if defined (BOOST_NO_STD_LOCALE)
+  const bool is_delimiter = !isspace(d);
+#elif defined ( BOOST_BORLANDC )
+  const bool is_delimiter = !std::use_facet< std::ctype< CharType > >
+    (is.getloc() ).is( std::ctype_base::space, d);
+#else
+  const bool is_delimiter = (!std::isspace(d, is.getloc()) );
+#endif
+
+  CharType c;
+  if (is_delimiter) {
+    is >> c;
+    if (is.good() && c!=d) {
+      is.setstate(std::ios::failbit);
+    }
+  } else {
+    is >> std::ws;
+  }
+  return is;
+}
+
+
+template<class CharType, class CharTrait, class T1>
+inline  std::basic_istream<CharType, CharTrait> &
+read (std::basic_istream<CharType, CharTrait> &is, cons<T1, null_type>& t1) {
+
+  if (!is.good()) return is;
+
+  return is >> t1.head;
+}
+
+template<class CharType, class CharTrait, class T1, class T2>
+inline std::basic_istream<CharType, CharTrait>&
+read(std::basic_istream<CharType, CharTrait> &is, cons<T1, T2>& t1) {
+
+  if (!is.good()) return is;
+
+  is >> t1.head;
+
+
+  extract_and_check_delimiter(is, format_info::delimiter);
+
+  return read(is, t1.tail);
+}
+
+} // end namespace detail
+
+
+template<class CharType, class CharTrait>
+inline std::basic_istream<CharType, CharTrait>&
+operator>>(std::basic_istream<CharType, CharTrait> &is, null_type&) {
+
+  if (!is.good() ) return is;
+
+  detail::extract_and_check_delimiter(is, detail::format_info::open);
+  detail::extract_and_check_delimiter(is, detail::format_info::close);
+
+  return is;
+}
+
+template<class CharType, class CharTrait, class T1, class T2>
+inline std::basic_istream<CharType, CharTrait>&
+operator>>(std::basic_istream<CharType, CharTrait>& is, cons<T1, T2>& t1) {
+
+  if (!is.good() ) return is;
+
+  detail::extract_and_check_delimiter(is, detail::format_info::open);
+
+  detail::read(is, t1);
+
+  detail::extract_and_check_delimiter(is, detail::format_info::close);
+
+  return is;
+}
+
+
+} // end of namespace tuples
+} // end of namespace boost
+
+#endif // BOOST_TUPLE_IO_HPP