--- /dev/null
+// Allocator traits -*- C++ -*-
+
+// Copyright (C) 2011, 2012, 2013 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 bits/alloc_traits.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{memory}
+ */
+
+#ifndef _ALLOC_TRAITS_H
+#define _ALLOC_TRAITS_H 1
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+
+#include <bits/ptr_traits.h>
+#include <ext/numeric_traits.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ template<typename _Tp>
+ class allocator;
+
+ 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>
+ const bool __alloctr_rebind_helper<_Alloc, _Tp>::__value;
+
+ 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;
+
+_GLIBCXX_ALLOC_TR_NESTED_TYPE(const_pointer,
+ typename pointer_traits<pointer>::template rebind<const value_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>)
+
+ /**
+ * @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>)
+
+ /**
+ * @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
+
+ template<typename _Tp>
+ using rebind_alloc = typename __alloctr_rebind<_Alloc, _Tp>::__type;
+ template<typename _Tp>
+ using rebind_traits = allocator_traits<rebind_alloc<_Tp>>;
+
+ 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<__and_<__not_<__construct_helper<_Tp, _Args...>>,
+ is_constructible<_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 __gnu_cxx::__numeric_traits<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 auto construct(_Alloc& __a, _Tp* __p, _Args&&... __args)
+ -> decltype(_S_construct(__a, __p, std::forward<_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); }
+ };
+
+ template<typename _Alloc>
+ template<typename _Alloc2>
+ const bool allocator_traits<_Alloc>::__allocate_helper<_Alloc2>::value;
+
+ template<typename _Alloc>
+ template<typename _Tp, typename... _Args>
+ const bool
+ allocator_traits<_Alloc>::__construct_helper<_Tp, _Args...>::value;
+
+ template<typename _Alloc>
+ template<typename _Tp>
+ const bool allocator_traits<_Alloc>::__destroy_helper<_Tp>::value;
+
+ template<typename _Alloc>
+ template<typename _Alloc2>
+ const bool allocator_traits<_Alloc>::__maxsize_helper<_Alloc2>::value;
+
+ template<typename _Alloc>
+ template<typename _Alloc2>
+ const bool allocator_traits<_Alloc>::__select_helper<_Alloc2>::value;
+
+ template<typename _Alloc>
+ inline void
+ __do_alloc_on_copy(_Alloc& __one, const _Alloc& __two, true_type)
+ { __one = __two; }
+
+ template<typename _Alloc>
+ inline void
+ __do_alloc_on_copy(_Alloc&, const _Alloc&, false_type)
+ { }
+
+ template<typename _Alloc>
+ inline void __alloc_on_copy(_Alloc& __one, const _Alloc& __two)
+ {
+ typedef allocator_traits<_Alloc> __traits;
+ typedef typename __traits::propagate_on_container_copy_assignment __pocca;
+ __do_alloc_on_copy(__one, __two, __pocca());
+ }
+
+ template<typename _Alloc>
+ inline _Alloc __alloc_on_copy(const _Alloc& __a)
+ {
+ typedef allocator_traits<_Alloc> __traits;
+ return __traits::select_on_container_copy_construction(__a);
+ }
+
+ template<typename _Alloc>
+ inline void __do_alloc_on_move(_Alloc& __one, _Alloc& __two, true_type)
+ { __one = std::move(__two); }
+
+ template<typename _Alloc>
+ inline void __do_alloc_on_move(_Alloc&, _Alloc&, false_type)
+ { }
+
+ template<typename _Alloc>
+ inline void __alloc_on_move(_Alloc& __one, _Alloc& __two)
+ {
+ typedef allocator_traits<_Alloc> __traits;
+ typedef typename __traits::propagate_on_container_move_assignment __pocma;
+ __do_alloc_on_move(__one, __two, __pocma());
+ }
+
+ template<typename _Alloc>
+ inline void __do_alloc_on_swap(_Alloc& __one, _Alloc& __two, true_type)
+ {
+ using std::swap;
+ swap(__one, __two);
+ }
+
+ template<typename _Alloc>
+ inline void __do_alloc_on_swap(_Alloc&, _Alloc&, false_type)
+ { }
+
+ template<typename _Alloc>
+ inline void __alloc_on_swap(_Alloc& __one, _Alloc& __two)
+ {
+ typedef allocator_traits<_Alloc> __traits;
+ typedef typename __traits::propagate_on_container_swap __pocs;
+ __do_alloc_on_swap(__one, __two, __pocs());
+ }
+
+ template<typename _Alloc>
+ class __is_copy_insertable_impl
+ {
+ typedef allocator_traits<_Alloc> _Traits;
+
+ template<typename _Up, typename
+ = decltype(_Traits::construct(std::declval<_Alloc&>(),
+ std::declval<_Up*>(),
+ std::declval<const _Up&>()))>
+ static true_type
+ _M_select(int);
+
+ template<typename _Up>
+ static false_type
+ _M_select(...);
+
+ public:
+ typedef decltype(_M_select<typename _Alloc::value_type>(0)) type;
+ };
+
+ // true if _Alloc::value_type is CopyInsertable into containers using _Alloc
+ template<typename _Alloc>
+ struct __is_copy_insertable
+ : __is_copy_insertable_impl<_Alloc>::type
+ { };
+
+ // std::allocator<_Tp> just requires CopyConstructible
+ template<typename _Tp>
+ struct __is_copy_insertable<allocator<_Tp>>
+ : is_copy_constructible<_Tp>
+ { };
+
+ // Used to allow copy construction of unordered containers
+ template<bool> struct __allow_copy_cons { };
+
+ // Used to delete copy constructor of unordered containers
+ template<>
+ struct __allow_copy_cons<false>
+ {
+ __allow_copy_cons() = default;
+ __allow_copy_cons(const __allow_copy_cons&) = delete;
+ __allow_copy_cons(__allow_copy_cons&&) = default;
+ __allow_copy_cons& operator=(const __allow_copy_cons&) = default;
+ __allow_copy_cons& operator=(__allow_copy_cons&&) = default;
+ };
+
+ template<typename _Alloc>
+ using __check_copy_constructible
+ = __allow_copy_cons<__is_copy_insertable<_Alloc>::value>;
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif
+#endif
projects / cross.git / blobdiff