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+// class template tuple -*- C++ -*-
+
+// Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// .
+
+/** @file tr1/tuple
+* This is a TR1 C++ Library header.
+*/
+
+// Chris Jefferson
+// Variadic Templates support by Douglas Gregor
+
+#ifndef _GLIBCXX_TR1_TUPLE
+#define _GLIBCXX_TR1_TUPLE 1
+
+#pragma GCC system_header
+
+#include
+
+namespace std
+{
+namespace tr1
+{
+ // Adds a const reference to a non-reference type.
+ template
+ struct __add_c_ref
+ { typedef const _Tp& type; };
+
+ template
+ struct __add_c_ref<_Tp&>
+ { typedef _Tp& type; };
+
+ // Adds a reference to a non-reference type.
+ template
+ struct __add_ref
+ { typedef _Tp& type; };
+
+ template
+ struct __add_ref<_Tp&>
+ { typedef _Tp& type; };
+
+ /**
+ * Contains the actual implementation of the @c tuple template, stored
+ * as a recursive inheritance hierarchy from the first element (most
+ * derived class) to the last (least derived class). The @c Idx
+ * parameter gives the 0-based index of the element stored at this
+ * point in the hierarchy; we use it to implement a constant-time
+ * get() operation.
+ */
+ template
+ struct _Tuple_impl;
+
+ /**
+ * Zero-element tuple implementation. This is the basis case for the
+ * inheritance recursion.
+ */
+ template
+ struct _Tuple_impl<_Idx> { };
+
+ /**
+ * Recursive tuple implementation. Here we store the @c Head element
+ * and derive from a @c Tuple_impl containing the remaining elements
+ * (which contains the @c Tail).
+ */
+ template
+ struct _Tuple_impl<_Idx, _Head, _Tail...>
+ : public _Tuple_impl<_Idx + 1, _Tail...>
+ {
+ typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited;
+
+ _Head _M_head;
+
+ _Inherited& _M_tail() { return *this; }
+ const _Inherited& _M_tail() const { return *this; }
+
+ _Tuple_impl() : _Inherited(), _M_head() { }
+
+ explicit
+ _Tuple_impl(typename __add_c_ref<_Head>::type __head,
+ typename __add_c_ref<_Tail>::type... __tail)
+ : _Inherited(__tail...), _M_head(__head) { }
+
+ template
+ _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in)
+ : _Inherited(__in._M_tail()), _M_head(__in._M_head) { }
+
+ _Tuple_impl(const _Tuple_impl& __in)
+ : _Inherited(__in._M_tail()), _M_head(__in._M_head) { }
+
+ template
+ _Tuple_impl&
+ operator=(const _Tuple_impl<_Idx, _UElements...>& __in)
+ {
+ _M_head = __in._M_head;
+ _M_tail() = __in._M_tail();
+ return *this;
+ }
+
+ _Tuple_impl&
+ operator=(const _Tuple_impl& __in)
+ {
+ _M_head = __in._M_head;
+ _M_tail() = __in._M_tail();
+ return *this;
+ }
+ };
+
+ template
+ class tuple : public _Tuple_impl<0, _Elements...>
+ {
+ typedef _Tuple_impl<0, _Elements...> _Inherited;
+
+ public:
+ tuple() : _Inherited() { }
+
+ explicit
+ tuple(typename __add_c_ref<_Elements>::type... __elements)
+ : _Inherited(__elements...) { }
+
+ template
+ tuple(const tuple<_UElements...>& __in)
+ : _Inherited(__in) { }
+
+ tuple(const tuple& __in)
+ : _Inherited(__in) { }
+
+ template
+ tuple&
+ operator=(const tuple<_UElements...>& __in)
+ {
+ static_cast<_Inherited&>(*this) = __in;
+ return *this;
+ }
+
+ tuple&
+ operator=(const tuple& __in)
+ {
+ static_cast<_Inherited&>(*this) = __in;
+ return *this;
+ }
+ };
+
+ template<> class tuple<> { };
+
+ // 2-element tuple, with construction and assignment from a pair.
+ template
+ class tuple<_T1, _T2> : public _Tuple_impl<0, _T1, _T2>
+ {
+ typedef _Tuple_impl<0, _T1, _T2> _Inherited;
+
+ public:
+ tuple() : _Inherited() { }
+
+ explicit
+ tuple(typename __add_c_ref<_T1>::type __a1,
+ typename __add_c_ref<_T2>::type __a2)
+ : _Inherited(__a1, __a2) { }
+
+ template
+ tuple(const tuple<_U1, _U2>& __in)
+ : _Inherited(__in) { }
+
+ tuple(const tuple& __in)
+ : _Inherited(__in) { }
+
+ template
+ tuple(const pair<_U1, _U2>& __in)
+ : _Inherited(_Tuple_impl<0,
+ typename __add_c_ref<_U1>::type,
+ typename __add_c_ref<_U2>::type>(__in.first,
+ __in.second))
+ { }
+
+ template
+ tuple&
+ operator=(const tuple<_U1, _U2>& __in)
+ {
+ static_cast<_Inherited&>(*this) = __in;
+ return *this;
+ }
+
+ tuple&
+ operator=(const tuple& __in)
+ {
+ static_cast<_Inherited&>(*this) = __in;
+ return *this;
+ }
+
+ template
+ tuple&
+ operator=(const pair<_U1, _U2>& __in)
+ {
+ this->_M_head = __in.first;
+ this->_M_tail()._M_head = __in.second;
+ return *this;
+ }
+ };
+
+
+ /// Gives the type of the ith element of a given tuple type.
+ template
+ struct tuple_element;
+
+ /**
+ * Recursive case for tuple_element: strip off the first element in
+ * the tuple and retrieve the (i-1)th element of the remaining tuple.
+ */
+ template
+ struct tuple_element<__i, tuple<_Head, _Tail...> >
+ : tuple_element<__i - 1, tuple<_Tail...> > { };
+
+ /**
+ * Basis case for tuple_element: The first element is the one we're seeking.
+ */
+ template
+ struct tuple_element<0, tuple<_Head, _Tail...> >
+ {
+ typedef _Head type;
+ };
+
+ /// Finds the size of a given tuple type.
+ template
+ struct tuple_size;
+
+ /// class tuple_size
+ template
+ struct tuple_size >
+ {
+ static const int value = sizeof...(_Elements);
+ };
+
+ template
+ const int tuple_size >::value;
+
+ template
+ inline typename __add_ref<_Head>::type
+ __get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t)
+ {
+ return __t._M_head;
+ }
+
+ template
+ inline typename __add_c_ref<_Head>::type
+ __get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t)
+ {
+ return __t._M_head;
+ }
+
+ // Return a reference (const reference) to the ith element of a tuple.
+ // Any const or non-const ref elements are returned with their original type.
+ template
+ inline typename __add_ref<
+ typename tuple_element<__i, tuple<_Elements...> >::type
+ >::type
+ get(tuple<_Elements...>& __t)
+ {
+ return __get_helper<__i>(__t);
+ }
+
+ template
+ inline typename __add_c_ref<
+ typename tuple_element<__i, tuple<_Elements...> >::type
+ >::type
+ get(const tuple<_Elements...>& __t)
+ {
+ return __get_helper<__i>(__t);
+ }
+
+ // This class helps construct the various comparison operations on tuples
+ template
+ struct __tuple_compare;
+
+ template
+ struct __tuple_compare<0, __i, __j, _Tp, _Up>
+ {
+ static bool __eq(const _Tp& __t, const _Up& __u)
+ {
+ return (get<__i>(__t) == get<__i>(__u) &&
+ __tuple_compare<0, __i+1, __j, _Tp, _Up>::__eq(__t, __u));
+ }
+
+ static bool __less(const _Tp& __t, const _Up& __u)
+ {
+ return ((get<__i>(__t) < get<__i>(__u))
+ || !(get<__i>(__u) < get<__i>(__t)) &&
+ __tuple_compare<0, __i+1, __j, _Tp, _Up>::__less(__t, __u));
+ }
+ };
+
+ template
+ struct __tuple_compare<0, __i, __i, _Tp, _Up>
+ {
+ static bool __eq(const _Tp&, const _Up&)
+ { return true; }
+
+ static bool __less(const _Tp&, const _Up&)
+ { return false; }
+ };
+
+ template
+ bool
+ operator==(const tuple<_TElements...>& __t,
+ const tuple<_UElements...>& __u)
+ {
+ typedef tuple<_TElements...> _Tp;
+ typedef tuple<_UElements...> _Up;
+ return (__tuple_compare::value - tuple_size<_Up>::value,
+ 0, tuple_size<_Tp>::value, _Tp, _Up>::__eq(__t, __u));
+ }
+
+ template
+ bool
+ operator<(const tuple<_TElements...>& __t,
+ const tuple<_UElements...>& __u)
+ {
+ typedef tuple<_TElements...> _Tp;
+ typedef tuple<_UElements...> _Up;
+ return (__tuple_compare::value - tuple_size<_Up>::value,
+ 0, tuple_size<_Tp>::value, _Tp, _Up>::__less(__t, __u));
+ }
+
+ template
+ inline bool
+ operator!=(const tuple<_TElements...>& __t,
+ const tuple<_UElements...>& __u)
+ { return !(__t == __u); }
+
+ template
+ inline bool
+ operator>(const tuple<_TElements...>& __t,
+ const tuple<_UElements...>& __u)
+ { return __u < __t; }
+
+ template
+ inline bool
+ operator<=(const tuple<_TElements...>& __t,
+ const tuple<_UElements...>& __u)
+ { return !(__u < __t); }
+
+ template
+ inline bool
+ operator>=(const tuple<_TElements...>& __t,
+ const tuple<_UElements...>& __u)
+ { return !(__t < __u); }
+
+ template
+ class reference_wrapper;
+
+ // Helper which adds a reference to a type when given a reference_wrapper
+ template
+ struct __strip_reference_wrapper
+ {
+ typedef _Tp __type;
+ };
+
+ template
+ struct __strip_reference_wrapper >
+ {
+ typedef _Tp& __type;
+ };
+
+ template
+ struct __strip_reference_wrapper >
+ {
+ typedef _Tp& __type;
+ };
+
+ template
+ inline tuple::__type...>
+ make_tuple(_Elements... __args)
+ {
+ typedef tuple::__type...>
+ __result_type;
+ return __result_type(__args...);
+ }
+
+ template
+ inline tuple<_Elements&...>
+ tie(_Elements&... __args)
+ {
+ return tuple<_Elements&...>(__args...);
+ }
+
+ // A class (and instance) which can be used in 'tie' when an element
+ // of a tuple is not required
+ struct _Swallow_assign
+ {
+ template
+ _Swallow_assign&
+ operator=(const _Tp&)
+ { return *this; }
+ };
+
+ // TODO: Put this in some kind of shared file.
+ namespace
+ {
+ _Swallow_assign ignore;
+ }; // anonymous namespace
+}
+}
+
+#endif // _GLIBCXX_TR1_TUPLE