// Allocators -*- C++ -*-
-// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
-// Free Software Foundation, Inc.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+// 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 2, or (at your option)
+// 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,
// 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 COPYING. If not, write to the Free
-// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-// USA.
+// 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.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// 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/>.
/*
* Copyright (c) 1996-1997
* purpose. It is provided "as is" without express or implied warranty.
*/
-/** @file allocator.h
+/** @file bits/allocator.h
* This is an internal header file, included by other library headers.
- * You should not attempt to use it directly.
+ * Do not attempt to use it directly. @headername{memory}
*/
#ifndef _ALLOCATOR_H
// Define the base class to std::allocator.
#include <bits/c++allocator.h>
-#include <bits/cpp_type_traits.h> // for __is_empty
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <bits/ptr_traits.h>
+#include <bits/uses_allocator.h>
+#include <limits>
+#endif
-_GLIBCXX_BEGIN_NAMESPACE(std)
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @defgroup allocators Allocators
+ * @ingroup memory
+ *
+ * Classes encapsulating memory operations.
+ */
template<typename _Tp>
class allocator;
};
/**
- * @brief The "standard" allocator, as per [20.4].
+ * @brief The @a standard allocator, as per [20.4].
+ * @ingroup allocators
*
- * Further details:
- * http://gcc.gnu.org/onlinedocs/libstdc++/20_util/allocator.html
+ * See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html
+ * for further details.
*/
template<typename _Tp>
class allocator: public __glibcxx_base_allocator<_Tp>
operator==(const allocator<_T1>&, const allocator<_T2>&)
{ return true; }
+ template<typename _Tp>
+ inline bool
+ operator==(const allocator<_Tp>&, const allocator<_Tp>&)
+ { return true; }
+
template<typename _T1, typename _T2>
inline bool
operator!=(const allocator<_T1>&, const allocator<_T2>&)
{ return false; }
+ template<typename _Tp>
+ inline bool
+ operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
+ { return false; }
+
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
- // NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
extern template class allocator<char>;
extern template class allocator<wchar_t>;
#undef __glibcxx_base_allocator
// To implement Option 3 of DR 431.
- template<typename _Alloc, bool = std::__is_empty<_Alloc>::__value>
+ template<typename _Alloc, bool = __is_empty(_Alloc)>
struct __alloc_swap
{ static void _S_do_it(_Alloc&, _Alloc&) { } };
}
};
-_GLIBCXX_END_NAMESPACE
+ // Optimize for stateless allocators.
+ template<typename _Alloc, bool = __is_empty(_Alloc)>
+ struct __alloc_neq
+ {
+ static bool
+ _S_do_it(const _Alloc&, const _Alloc&)
+ { return false; }
+ };
+
+ template<typename _Alloc>
+ struct __alloc_neq<_Alloc, false>
+ {
+ static bool
+ _S_do_it(const _Alloc& __one, const _Alloc& __two)
+ { return __one != __two; }
+ };
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ // A very basic implementation for now. In general we have to wait for
+ // the availability of the infrastructure described in N2983: we should
+ // try when either T has a move constructor which cannot throw or T is
+ // CopyConstructible.
+ // NB: This code doesn't properly belong here, we should find a more
+ // suited place common to std::vector and std::deque.
+ template<typename _Tp,
+ bool = __has_trivial_copy(typename _Tp::value_type)>
+ struct __shrink_to_fit
+ { static void _S_do_it(_Tp&) { } };
+
+ template<typename _Tp>
+ struct __shrink_to_fit<_Tp, true>
+ {
+ static void
+ _S_do_it(_Tp& __v)
+ {
+ __try
+ { _Tp(__v).swap(__v); }
+ __catch(...) { }
+ }
+ };
+
+ template<typename _Alloc, typename _Tp>
+ class __alloctr_rebind_helper
+ {
+ template<typename _Alloc2, typename _Tp2>
+ static constexpr bool
+ _S_chk(typename _Alloc2::template rebind<_Tp2>::other*)
+ { return true; }
+
+ template<typename, typename>
+ static constexpr bool
+ _S_chk(...)
+ { return false; }
+
+ public:
+ static const bool __value = _S_chk<_Alloc, _Tp>(nullptr);
+ };
+
+ template<typename _Alloc, typename _Tp,
+ bool = __alloctr_rebind_helper<_Alloc, _Tp>::__value>
+ struct __alloctr_rebind;
+
+ template<typename _Alloc, typename _Tp>
+ struct __alloctr_rebind<_Alloc, _Tp, true>
+ {
+ typedef typename _Alloc::template rebind<_Tp>::other __type;
+ };
+
+ template<template<typename, typename...> class _Alloc, typename _Tp,
+ typename _Up, typename... _Args>
+ struct __alloctr_rebind<_Alloc<_Up, _Args...>, _Tp, false>
+ {
+ typedef _Alloc<_Tp, _Args...> __type;
+ };
+
+ /**
+ * @brief Uniform interface to all allocator types.
+ * @ingroup allocators
+ */
+ template<typename _Alloc>
+ struct allocator_traits
+ {
+ /// The allocator type
+ typedef _Alloc allocator_type;
+ /// The allocated type
+ typedef typename _Alloc::value_type value_type;
+
+#define _GLIBCXX_ALLOC_TR_NESTED_TYPE(_NTYPE, _ALT) \
+ private: \
+ template<typename _Tp> \
+ static typename _Tp::_NTYPE _S_##_NTYPE##_helper(_Tp*); \
+ static _ALT _S_##_NTYPE##_helper(...); \
+ typedef decltype(_S_##_NTYPE##_helper((_Alloc*)0)) __##_NTYPE; \
+ public:
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(pointer, value_type*)
+
+ /**
+ * @brief The allocator's pointer type.
+ *
+ * @c Alloc::pointer if that type exists, otherwise @c value_type*
+ */
+ typedef __pointer pointer;
+
+// TODO: Use pointer_traits::rebind alias template.
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_pointer,
+ typename pointer_traits<pointer>::template __rebind<const value_type>::__type)
+
+ /**
+ * @brief The allocator's const pointer type.
+ *
+ * @c Alloc::const_pointer if that type exists, otherwise
+ * <tt> pointer_traits<pointer>::rebind<const value_type> </tt>
+ */
+ typedef __const_pointer const_pointer;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(void_pointer,
+ typename pointer_traits<pointer>::template __rebind<void>::__type)
+
+ /**
+ * @brief The allocator's void pointer type.
+ *
+ * @c Alloc::void_pointer if that type exists, otherwise
+ * <tt> pointer_traits<pointer>::rebind<void> </tt>
+ */
+ typedef __void_pointer void_pointer;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_void_pointer,
+ typename pointer_traits<pointer>::template __rebind<const void>::__type)
+
+ /**
+ * @brief The allocator's const void pointer type.
+ *
+ * @c Alloc::const_void_pointer if that type exists, otherwise
+ * <tt> pointer_traits<pointer>::rebind<const void> </tt>
+ */
+ typedef __const_void_pointer const_void_pointer;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(difference_type,
+ typename pointer_traits<pointer>::difference_type)
+
+ /**
+ * @brief The allocator's difference type
+ *
+ * @c Alloc::difference_type if that type exists, otherwise
+ * <tt> pointer_traits<pointer>::difference_type </tt>
+ */
+ typedef __difference_type difference_type;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(size_type,
+ typename make_unsigned<difference_type>::type)
+
+ /**
+ * @brief The allocator's size type
+ *
+ * @c Alloc::size_type if that type exists, otherwise
+ * <tt> make_unsigned<difference_type>::type </tt>
+ */
+ typedef __size_type size_type;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_copy_assignment,
+ false_type)
+
+ /**
+ * @brief How the allocator is propagated on copy assignment
+ *
+ * @c Alloc::propagate_on_container_copy_assignment if that type exists,
+ * otherwise @c false_type
+ */
+ typedef __propagate_on_container_copy_assignment
+ propagate_on_container_copy_assignment;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_move_assignment,
+ false_type)
+
+ /**
+ * @brief How the allocator is propagated on move assignment
+ *
+ * @c Alloc::propagate_on_container_move_assignment if that type exists,
+ * otherwise @c false_type
+ */
+ typedef __propagate_on_container_move_assignment
+ propagate_on_container_move_assignment;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(propagate_on_container_swap,
+ false_type)
+
+ /**
+ * @brief How the allocator is propagated on swap
+ *
+ * @c Alloc::propagate_on_container_swap if that type exists,
+ * otherwise @c false_type
+ */
+ typedef __propagate_on_container_swap propagate_on_container_swap;
+
+#undef _GLIBCXX_ALLOC_TR_NESTED_TYPE
+
+ /* TODO: use template alias
+ template<typename _Tp>
+ using rebind_alloc = __alloctr_rebind<_Alloc, _Tp>::__type;
+ template<typename _Tp>
+ using rebind_traits = allocator_traits<rebind_alloc<_Tp>>;
+ */
+ template<typename _Tp>
+ struct __rebind_alloc
+ {
+ typedef typename __alloctr_rebind<_Alloc, _Tp>::__type __type;
+ };
+
+ template<typename _Tp>
+ struct __rebind_traits
+ {
+ typedef allocator_traits<typename __rebind_alloc<_Tp>::__type> __type;
+ };
+
+ private:
+ template<typename _Alloc2>
+ struct __allocate_helper
+ {
+ template<typename _Alloc3,
+ typename = decltype(std::declval<_Alloc3*>()->allocate(
+ std::declval<size_type>(),
+ std::declval<const_void_pointer>()))>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+
+ typedef decltype(__test<_Alloc>(0)) type;
+ static const bool value = type::value;
+ };
+
+ template<typename _Alloc2>
+ static typename
+ enable_if<__allocate_helper<_Alloc2>::value, pointer>::type
+ _S_allocate(_Alloc2& __a, size_type __n, const_void_pointer __hint)
+ { return __a.allocate(__n, __hint); }
+
+ template<typename _Alloc2>
+ static typename
+ enable_if<!__allocate_helper<_Alloc2>::value, pointer>::type
+ _S_allocate(_Alloc2& __a, size_type __n, ...)
+ { return __a.allocate(__n); }
+
+ template<typename _Tp, typename... _Args>
+ struct __construct_helper
+ {
+ template<typename _Alloc2,
+ typename = decltype(std::declval<_Alloc2*>()->construct(
+ std::declval<_Tp*>(), std::declval<_Args>()...))>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+
+ typedef decltype(__test<_Alloc>(0)) type;
+ static const bool value = type::value;
+ };
+
+ template<typename _Tp, typename... _Args>
+ static typename
+ enable_if<__construct_helper<_Tp, _Args...>::value, void>::type
+ _S_construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
+ { __a.construct(__p, std::forward<_Args>(__args)...); }
+
+ template<typename _Tp, typename... _Args>
+ static typename
+ enable_if<!__construct_helper<_Tp, _Args...>::value, void>::type
+ _S_construct(_Alloc&, _Tp* __p, _Args&&... __args)
+ { ::new((void*)__p) _Tp(std::forward<_Args>(__args)...); }
+
+ template<typename _Tp>
+ struct __destroy_helper
+ {
+ template<typename _Alloc2,
+ typename = decltype(std::declval<_Alloc2*>()->destroy(
+ std::declval<_Tp*>()))>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+
+ typedef decltype(__test<_Alloc>(0)) type;
+ static const bool value = type::value;
+ };
+
+ template<typename _Tp>
+ static typename enable_if<__destroy_helper<_Tp>::value, void>::type
+ _S_destroy(_Alloc& __a, _Tp* __p)
+ { __a.destroy(__p); }
+
+ template<typename _Tp>
+ static typename enable_if<!__destroy_helper<_Tp>::value, void>::type
+ _S_destroy(_Alloc&, _Tp* __p)
+ { __p->~_Tp(); }
+
+ template<typename _Alloc2>
+ struct __maxsize_helper
+ {
+ template<typename _Alloc3,
+ typename = decltype(std::declval<_Alloc3*>()->max_size())>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+
+ typedef decltype(__test<_Alloc2>(0)) type;
+ static const bool value = type::value;
+ };
+
+ template<typename _Alloc2>
+ static typename
+ enable_if<__maxsize_helper<_Alloc2>::value, size_type>::type
+ _S_max_size(_Alloc2& __a)
+ { return __a.max_size(); }
+
+ template<typename _Alloc2>
+ static typename
+ enable_if<!__maxsize_helper<_Alloc2>::value, size_type>::type
+ _S_max_size(_Alloc2&)
+ { return numeric_limits<size_type>::max(); }
+
+ template<typename _Alloc2>
+ struct __select_helper
+ {
+ template<typename _Alloc3, typename
+ = decltype(std::declval<_Alloc3*>()
+ ->select_on_container_copy_construction())>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+
+ typedef decltype(__test<_Alloc2>(0)) type;
+ static const bool value = type::value;
+ };
+ template<typename _Alloc2>
+ static typename
+ enable_if<__select_helper<_Alloc2>::value, _Alloc2>::type
+ _S_select(_Alloc2& __a)
+ { return __a.select_on_container_copy_construction(); }
+
+ template<typename _Alloc2>
+ static typename
+ enable_if<!__select_helper<_Alloc2>::value, _Alloc2>::type
+ _S_select(_Alloc2& __a)
+ { return __a; }
+
+ public:
+
+ /**
+ * @brief Allocate memory.
+ * @param a An allocator.
+ * @param n The number of objects to allocate space for.
+ *
+ * Calls @c a.allocate(n)
+ */
+ static pointer
+ allocate(_Alloc& __a, size_type __n)
+ { return __a.allocate(__n); }
+
+ /**
+ * @brief Allocate memory.
+ * @param a An allocator.
+ * @param n The number of objects to allocate space for.
+ * @param hint Aid to locality.
+ * @return Memory of suitable size and alignment for @a n objects
+ * of type @c value_type
+ *
+ * Returns <tt> a.allocate(n, hint) </tt> if that expression is
+ * well-formed, otherwise returns @c a.allocate(n)
+ */
+ static pointer
+ allocate(_Alloc& __a, size_type __n, const_void_pointer __hint)
+ { return _S_allocate(__a, __n, __hint); }
+
+ /**
+ * @brief Deallocate memory.
+ * @param a An allocator.
+ * @param p Pointer to the memory to deallocate.
+ * @param n The number of objects space was allocated for.
+ *
+ * Calls <tt> a.deallocate(p, n) </tt>
+ */
+ static void deallocate(_Alloc& __a, pointer __p, size_type __n)
+ { __a.deallocate(__p, __n); }
+
+ /**
+ * @brief Construct an object of type @a Tp
+ * @param a An allocator.
+ * @param p Pointer to memory of suitable size and alignment for Tp
+ * @param args Constructor arguments.
+ *
+ * Calls <tt> a.construct(p, std::forward<Args>(args)...) </tt>
+ * if that expression is well-formed, otherwise uses placement-new
+ * to construct an object of type @a Tp at location @a p from the
+ * arguments @a args...
+ */
+ template<typename _Tp, typename... _Args>
+ static void construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
+ { _S_construct(__a, __p, std::forward<_Args>(__args)...); }
+
+ /**
+ * @brief Destroy an object of type @a Tp
+ * @param a An allocator.
+ * @param p Pointer to the object to destroy
+ *
+ * Calls @c a.destroy(p) if that expression is well-formed,
+ * otherwise calls @c p->~Tp()
+ */
+ template <class _Tp>
+ static void destroy(_Alloc& __a, _Tp* __p)
+ { _S_destroy(__a, __p); }
+
+ /**
+ * @brief The maximum supported allocation size
+ * @param a An allocator.
+ * @return @c a.max_size() or @c %numeric_limits<size_type>::max()
+ *
+ * Returns @c a.max_size() if that expression is well-formed,
+ * otherwise returns @c %numeric_limits<size_type>::max()
+ */
+ static size_type max_size(const _Alloc& __a)
+ { return _S_max_size(__a); }
+
+ /**
+ * @brief Obtain an allocator to use when copying a container.
+ * @param rhs An allocator.
+ * @return @c rhs.select_on_container_copy_construction() or @a rhs
+ *
+ * Returns @c rhs.select_on_container_copy_construction() if that
+ * expression is well-formed, otherwise returns @a rhs
+ */
+ static _Alloc
+ select_on_container_copy_construction(const _Alloc& __rhs)
+ { return _S_select(__rhs); }
+ };
+
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
#endif
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