--- /dev/null
+// <scoped_allocator> -*- C++ -*-
+
+// Copyright (C) 2011 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
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/scoped_allocator
+ * This is a Standard C++ Library header.
+ */
+
+#ifndef _SCOPED_ALLOCATOR
+#define _SCOPED_ALLOCATOR 1
+
+#pragma GCC system_header
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <bits/c++0x_warning.h>
+#else
+
+#include <utility>
+#include <tuple>
+#include <bits/alloc_traits.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ template<template<typename> class _Pred, typename... _Allocs>
+ struct __any_of;
+
+ template<template<typename> class _Pred, typename _Alloc, typename... _Allocs>
+ struct __any_of<_Pred, _Alloc, _Allocs...>
+ : __or_<_Pred<_Alloc>, __any_of<_Pred, _Allocs...>>
+ { };
+
+ template<template<typename> class _Pred, typename _Alloc>
+ struct __any_of<_Pred, _Alloc>
+ : _Pred<_Alloc>
+ { };
+
+ /**
+ * @addtogroup allocators
+ * @{
+ */
+
+ template<typename _Alloc>
+ struct __propagate_on_copy
+ : allocator_traits<_Alloc>::propagate_on_container_copy_assignment
+ { };
+ template<typename _Alloc>
+ struct __propagate_on_move
+ : allocator_traits<_Alloc>::propagate_on_container_move_assignment
+ { };
+ template<typename _Alloc>
+ struct __propagate_on_swap
+ : allocator_traits<_Alloc>::propagate_on_container_swap
+ { };
+
+
+ template<typename _Alloc>
+ inline auto
+ __do_outermost(_Alloc& __a, _Alloc&) -> decltype(__a.outer_allocator())
+ { return __a.outer_allocator(); }
+
+ template<typename _Alloc>
+ inline _Alloc&
+ __do_outermost(_Alloc& __a, ...)
+ { return __a; }
+
+ template<typename _Alloc>
+ inline auto
+ __outermost(_Alloc& __a) -> decltype(__do_outermost(__a, __a))
+ { return __do_outermost(__a, __a); }
+
+ template<typename _OuterAlloc, typename... _InnerAllocs>
+ class scoped_allocator_adaptor;
+
+ template<typename...> struct __inner_type_impl;
+
+ template<typename _Outer>
+ struct __inner_type_impl<_Outer>
+ {
+ typedef scoped_allocator_adaptor<_Outer> __type;
+
+ __inner_type_impl() = default;
+ __inner_type_impl(const __inner_type_impl&) = default;
+ __inner_type_impl(__inner_type_impl&&) = default;
+
+ template<typename _Alloc>
+ __inner_type_impl(const __inner_type_impl<_Alloc>& __other)
+ { }
+
+ template<typename _Alloc>
+ __inner_type_impl(__inner_type_impl<_Alloc>&& __other)
+ { }
+
+ __type& _M_get(__type* __p) noexcept { return *__p; }
+ const __type& _M_get(const __type* __p) const noexcept { return *__p; }
+
+ tuple<> _M_tie() const noexcept { return tuple<>(); }
+
+ bool operator==(const __inner_type_impl&) const noexcept
+ { return true; }
+ };
+
+ template<typename _Outer, typename _InnerHead, typename... _InnerTail>
+ struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...>
+ {
+ typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type;
+
+ __inner_type_impl() = default;
+ __inner_type_impl(const __inner_type_impl&) = default;
+ __inner_type_impl(__inner_type_impl&&) = default;
+
+ template<typename... _Allocs>
+ __inner_type_impl(const __inner_type_impl<_Allocs...>& __other)
+ : _M_inner(__other._M_inner) { }
+
+ template<typename... _Allocs>
+ __inner_type_impl(__inner_type_impl<_Allocs...>&& __other)
+ : _M_inner(std::move(__other._M_inner)) { }
+
+ template<typename... _Args>
+ explicit
+ __inner_type_impl(_Args&&... __args)
+ : _M_inner(std::forward<_Args>(__args)...) { }
+
+ __type& _M_get(void*) noexcept { return _M_inner; }
+ const __type& _M_get(const void*) const noexcept { return _M_inner; }
+
+ tuple<const _InnerHead&, const _InnerTail&...> _M_tie() const noexcept
+ { return _M_inner._M_tie(); }
+
+ bool operator==(const __inner_type_impl& __other) const noexcept
+ { return _M_inner == __other._M_inner; }
+
+ private:
+ template<typename...> friend class __inner_type_impl;
+ template<typename, typename...> friend class scoped_allocator_adaptor;
+
+ __type _M_inner;
+ };
+
+ template<typename _OuterAlloc, typename... _InnerAllocs>
+ class scoped_allocator_adaptor
+ : public _OuterAlloc
+ {
+ typedef allocator_traits<_OuterAlloc> __traits;
+
+ typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type;
+ __inner_type _M_inner;
+
+ template<typename _Outer, typename... _Inner>
+ friend class scoped_allocator_adaptor;
+
+ template<typename...>
+ friend class __inner_type_impl;
+
+ tuple<const _OuterAlloc&, const _InnerAllocs&...>
+ _M_tie() const noexcept
+ { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); }
+
+
+ template<typename _Tp, typename... _Args>
+ void _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args)
+ {
+ auto& __outer = __outermost(*this);
+ typedef typename std::decay<decltype(__outer)>::type __outer_type;
+ typedef allocator_traits<__outer_type> __o_traits;
+ __o_traits::construct(__outer, __p, std::forward<_Args>(__args)...);
+ }
+
+ typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_;
+ typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_;
+
+ template<typename _Tp, typename... _Args>
+ void _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args)
+ {
+ auto& __outer = __outermost(*this);
+ typedef typename std::decay<decltype(__outer)>::type __outer_type;
+ typedef allocator_traits<__outer_type> __o_traits;
+ __o_traits::construct(__outer, __p, allocator_arg, inner_allocator(),
+ std::forward<_Args>(__args)...);
+ }
+
+ template<typename _Tp, typename... _Args>
+ void _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args)
+ {
+ auto& __outer = __outermost(*this);
+ typedef typename std::decay<decltype(__outer)>::type __outer_type;
+ typedef allocator_traits<__outer_type> __o_traits;
+ __o_traits::construct(__outer, __p, std::forward<_Args>(__args)...,
+ inner_allocator());
+ }
+
+ template<typename _Alloc>
+ static _Alloc
+ _S_select_on_copy(const _Alloc& __a)
+ {
+ typedef allocator_traits<_Alloc> __a_traits;
+ return __a_traits::select_on_container_copy_construction(__a);
+ }
+
+ template<int... _Indices>
+ scoped_allocator_adaptor(tuple<const _OuterAlloc&,
+ const _InnerAllocs&...> __refs,
+ _Index_tuple<_Indices...>)
+ : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))),
+ _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...)
+ { }
+
+ public:
+ typedef _OuterAlloc outer_allocator_type;
+ typedef typename __inner_type::__type inner_allocator_type;
+
+ typedef typename __traits::value_type value_type;
+ typedef typename __traits::size_type size_type;
+ typedef typename __traits::difference_type difference_type;
+ typedef typename __traits::pointer pointer;
+ typedef typename __traits::const_pointer const_pointer;
+ typedef typename __traits::void_pointer void_pointer;
+ typedef typename __traits::const_void_pointer const_void_pointer;
+
+ typedef typename conditional<
+ __any_of<__propagate_on_copy, _OuterAlloc, _InnerAllocs...>::value,
+ true_type, false_type>::type propagate_on_container_copy_assignment;
+ typedef typename conditional<
+ __any_of<__propagate_on_move, _OuterAlloc, _InnerAllocs...>::value,
+ true_type, false_type>::type propagate_on_container_move_assignment;
+ typedef typename conditional<
+ __any_of<__propagate_on_swap, _OuterAlloc, _InnerAllocs...>::value,
+ true_type, false_type>::type propagate_on_container_swap;
+
+ template <class _Tp>
+ struct rebind
+ {
+ // TODO: use rebind_alloc<Tp> instead of __rebind_alloc<Tp>::__type
+ typedef scoped_allocator_adaptor<
+ typename __traits::template __rebind_alloc<_Tp>::__type,
+ _InnerAllocs...> other;
+ };
+
+ scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { }
+
+ template<typename _Outer2>
+ scoped_allocator_adaptor(_Outer2&& __outer,
+ const _InnerAllocs&... __inner)
+ : _OuterAlloc(std::forward<_Outer2>(__outer)),
+ _M_inner(__inner...)
+ { }
+
+ scoped_allocator_adaptor(const scoped_allocator_adaptor& __other)
+ : _OuterAlloc(__other.outer_allocator()),
+ _M_inner(__other._M_inner)
+ { }
+
+ scoped_allocator_adaptor(scoped_allocator_adaptor&& __other)
+ : _OuterAlloc(std::move(__other.outer_allocator())),
+ _M_inner(std::move(__other._M_inner))
+ { }
+
+ template<typename _Outer2>
+ scoped_allocator_adaptor(
+ const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other)
+ : _OuterAlloc(__other.outer_allocator()),
+ _M_inner(__other._M_inner)
+ { }
+
+ template<typename _Outer2>
+ scoped_allocator_adaptor(
+ scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other)
+ : _OuterAlloc(std::move(__other.outer_allocator())),
+ _M_inner(std::move(__other._M_inner))
+ { }
+
+ inner_allocator_type& inner_allocator() noexcept
+ { return _M_inner._M_get(this); }
+
+ const inner_allocator_type& inner_allocator() const noexcept
+ { return _M_inner._M_get(this); }
+
+ outer_allocator_type& outer_allocator() noexcept
+ { return static_cast<_OuterAlloc&>(*this); }
+
+ const outer_allocator_type& outer_allocator() const noexcept
+ { return static_cast<const _OuterAlloc&>(*this); }
+
+ pointer allocate(size_type __n)
+ { return __traits::allocate(outer_allocator(), __n); }
+
+ pointer allocate(size_type __n, const_void_pointer __hint)
+ { return __traits::allocate(outer_allocator(), __n, __hint); }
+
+ void deallocate(pointer __p, size_type __n)
+ { return __traits::deallocate(outer_allocator(), __p, __n); }
+
+ size_type max_size() const
+ { return __traits::max_size(outer_allocator()); }
+
+ template<typename _Tp, typename... _Args>
+ void construct(_Tp* __p, _Args&&... __args)
+ {
+ auto& __inner = inner_allocator();
+ auto __use_tag
+ = __use_alloc<_Tp, inner_allocator_type, _Args...>(__inner);
+ _M_construct(__use_tag, __p, std::forward<_Args>(__args)...);
+ }
+
+ // TODO: construct pairs
+
+ template<typename _Tp>
+ void destroy(_Tp* __p)
+ {
+ auto& __outer = __outermost(*this);
+ typedef typename std::decay<decltype(__outer)>::type __outer_type;
+ allocator_traits<__outer_type>::destroy(__outer, __p);
+ }
+
+ scoped_allocator_adaptor
+ select_on_container_copy_construction() const
+ {
+ typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type
+ _Indices;
+ return scoped_allocator_adaptor(_M_tie(), _Indices());
+ }
+
+ template <typename _OutA1, typename _OutA2, typename... _InA>
+ friend bool
+ operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
+ const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept;
+ };
+
+ template <typename _OutA1, typename _OutA2, typename... _InA>
+ inline bool
+ operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
+ const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept
+ {
+ return __a.outer_allocator() == __b.outer_allocator()
+ && __a._M_inner == __b._M_inner;
+ }
+
+ template <typename _OutA1, typename _OutA2, typename... _InA>
+ inline bool
+ operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
+ const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept
+ { return !(__a == __b); }
+
+ /// @}
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+#endif // _SCOPED_ALLOCATOR
--- /dev/null
+// { dg-do compile }
+// { dg-options "-std=gnu++0x" }
+
+// Copyright (C) 2011 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// test that propagate_on_container_xxx is true iff it is true for
+// any of the outer or inner allocators
+
+#include <scoped_allocator>
+
+using std::scoped_allocator_adaptor;
+
+typedef short test_type;
+
+template<typename T>
+ struct minimal_allocator
+ {
+ typedef T value_type;
+ minimal_allocator();
+ template <typename U>
+ minimal_allocator(const minimal_allocator<U>&);
+ T* allocate(std::size_t);
+ void deallocate(T*, std::size_t);
+ };
+
+template<typename T, bool copy, bool move, bool swap>
+ struct test_allocator : minimal_allocator<T>
+ {
+ struct propagate_on_container_copy_assignment
+ { static const bool value = copy; };
+
+ struct propagate_on_container_move_assignment
+ { static const bool value = move; };
+
+ struct propagate_on_container_swap
+ { static const bool value = swap; };
+ };
+
+template<typename A>
+ constexpr bool prop_on_copy()
+ {
+ typedef typename A::propagate_on_container_copy_assignment type;
+ return type::value;
+ }
+
+template<typename A>
+ constexpr bool prop_on_move()
+ {
+ typedef typename A::propagate_on_container_move_assignment type;
+ return type::value;
+ }
+
+template<typename A>
+ constexpr bool prop_on_swap()
+ {
+ typedef typename A::propagate_on_container_swap type;
+ return type::value;
+ }
+
+template<typename A, bool C, bool M, bool S>
+ constexpr bool test1()
+ {
+ static_assert( prop_on_copy<A>() == C, "copy" );
+ static_assert( prop_on_move<A>() == M, "move" );
+ static_assert( prop_on_swap<A>() == S, "swap" );
+ return true;
+ }
+
+template<bool C, bool M, bool S>
+ constexpr bool test2()
+ {
+ typedef minimal_allocator<test_type> base_alloc;
+ typedef test_allocator<test_type, C, M, S> test_alloc;
+ typedef scoped_allocator_adaptor<base_alloc, test_alloc> scoped1;
+ typedef scoped_allocator_adaptor<test_alloc, base_alloc> scoped2;
+ typedef scoped_allocator_adaptor<test_alloc, test_alloc> scoped3;
+ return test1<scoped1, C, M, S>()
+ && test1<scoped2, C, M, S>()
+ && test1<scoped3, C, M, S>();
+ }
+
+static_assert( test2<false, false, false>(), "never propagate" );
+static_assert( test2<true, false, false>(), "propagate on copy" );
+static_assert( test2<false, true, false>(), "propagate on move" );
+static_assert( test2<false, false, true>(), "propagate on swap" );
+static_assert( test2<true, true, false>(), "propagate on copy & move" );
+static_assert( test2<true, false, true>(), "propagate on copy & swap" );
+static_assert( test2<false, true, true>(), "propagate on move & swap" );
+static_assert( test2<true, true, true>(), "always propagate" );
+
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