1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// Allocator that wraps operator new -*- C++ -*-
// Copyright (C) 2001-2014 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 ext/new_allocator.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _NEW_ALLOCATOR_H
#define _NEW_ALLOCATOR_H 1
#include <bits/c++config.h>
#include <new>
#include <bits/functexcept.h>
#include <bits/move.h>
#if __cplusplus >= 201103L
#include <type_traits>
#endif
namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
using std::size_t;
using std::ptrdiff_t;
/**
* @brief An allocator that uses global new, as per [20.4].
* @ingroup allocators
*
* This is precisely the allocator defined in the C++ Standard.
* - all allocation calls operator new
* - all deallocation calls operator delete
*
* @tparam _Tp Type of allocated object.
*/
template<typename _Tp>
class new_allocator
{
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef _Tp* pointer;
typedef const _Tp* const_pointer;
typedef _Tp& reference;
typedef const _Tp& const_reference;
typedef _Tp value_type;
template<typename _Tp1>
struct rebind
{ typedef new_allocator<_Tp1> other; };
#if __cplusplus >= 201103L
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2103. propagate_on_container_move_assignment
typedef std::true_type propagate_on_container_move_assignment;
#endif
new_allocator() _GLIBCXX_USE_NOEXCEPT { }
new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }
template<typename _Tp1>
new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
~new_allocator() _GLIBCXX_USE_NOEXCEPT { }
pointer
address(reference __x) const _GLIBCXX_NOEXCEPT
{ return std::__addressof(__x); }
const_pointer
address(const_reference __x) const _GLIBCXX_NOEXCEPT
{ return std::__addressof(__x); }
// NB: __n is permitted to be 0. The C++ standard says nothing
// about what the return value is when __n == 0.
pointer
allocate(size_type __n, const void* = 0)
{
if (__n > this->max_size())
std::__throw_bad_alloc();
return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
}
#ifdef __GXX_DELETE_WITH_SIZE__
// __p is not permitted to be a null pointer.
void
deallocate(pointer __p, size_type __t)
{ ::operator delete(__p, __t * sizeof(_Tp)); }
#else
// __p is not permitted to be a null pointer.
void
deallocate(pointer __p, size_type)
{ ::operator delete(__p); }
#endif
size_type
max_size() const _GLIBCXX_USE_NOEXCEPT
{ return size_t(-1) / sizeof(_Tp); }
#if __cplusplus >= 201103L
template<typename _Up, typename... _Args>
void
construct(_Up* __p, _Args&&... __args)
{ ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
template<typename _Up>
void
destroy(_Up* __p) { __p->~_Up(); }
#else
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 402. wrong new expression in [some_] allocator::construct
void
construct(pointer __p, const _Tp& __val)
{ ::new((void *)__p) _Tp(__val); }
void
destroy(pointer __p) { __p->~_Tp(); }
#endif
};
template<typename _Tp>
inline bool
operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
{ return true; }
template<typename _Tp>
inline bool
operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
{ return false; }
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif
|
