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1 : : // Allocator that wraps operator new -*- C++ -*-
2 : :
3 : : // Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 : : //
5 : : // This file is part of the GNU ISO C++ Library. This library is free
6 : : // software; you can redistribute it and/or modify it under the
7 : : // terms of the GNU General Public License as published by the
8 : : // Free Software Foundation; either version 2, or (at your option)
9 : : // any later version.
10 : :
11 : : // This library is distributed in the hope that it will be useful,
12 : : // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : : // GNU General Public License for more details.
15 : :
16 : : // You should have received a copy of the GNU General Public License along
17 : : // with this library; see the file COPYING. If not, write to the Free
18 : : // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19 : : // USA.
20 : :
21 : : // As a special exception, you may use this file as part of a free software
22 : : // library without restriction. Specifically, if other files instantiate
23 : : // templates or use macros or inline functions from this file, or you compile
24 : : // this file and link it with other files to produce an executable, this
25 : : // file does not by itself cause the resulting executable to be covered by
26 : : // the GNU General Public License. This exception does not however
27 : : // invalidate any other reasons why the executable file might be covered by
28 : : // the GNU General Public License.
29 : :
30 : : /** @file ext/new_allocator.h
31 : : * This file is a GNU extension to the Standard C++ Library.
32 : : */
33 : :
34 : : #ifndef _NEW_ALLOCATOR_H
35 : : #define _NEW_ALLOCATOR_H 1
36 : :
37 : : #include <new>
38 : : #include <bits/functexcept.h>
39 : : #include <bits/stl_move.h>
40 : :
41 : : _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
42 : :
43 : : using std::size_t;
44 : : using std::ptrdiff_t;
45 : :
46 : : /**
47 : : * @brief An allocator that uses global new, as per [20.4].
48 : : *
49 : : * This is precisely the allocator defined in the C++ Standard.
50 : : * - all allocation calls operator new
51 : : * - all deallocation calls operator delete
52 : : */
53 : : template<typename _Tp>
54 : : class new_allocator
55 : : {
56 : : public:
57 : : typedef size_t size_type;
58 : : typedef ptrdiff_t difference_type;
59 : : typedef _Tp* pointer;
60 : : typedef const _Tp* const_pointer;
61 : : typedef _Tp& reference;
62 : : typedef const _Tp& const_reference;
63 : : typedef _Tp value_type;
64 : :
65 : : template<typename _Tp1>
66 : : struct rebind
67 : : { typedef new_allocator<_Tp1> other; };
68 : :
69 : : new_allocator() throw() { }
70 : :
71 : : new_allocator(const new_allocator&) throw() { }
72 : :
73 : : template<typename _Tp1>
74 : : new_allocator(const new_allocator<_Tp1>&) throw() { }
75 : :
76 : : ~new_allocator() throw() { }
77 : :
78 : : pointer
79 : : address(reference __x) const { return &__x; }
80 : :
81 : : const_pointer
82 : : address(const_reference __x) const { return &__x; }
83 : :
84 : : // NB: __n is permitted to be 0. The C++ standard says nothing
85 : : // about what the return value is when __n == 0.
86 : : pointer
87 : : allocate(size_type __n, const void* = 0)
88 : : {
89 [ # # ][ - + ]: 82506 : if (__builtin_expect(__n > this->max_size(), false))
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90 : 0 : std::__throw_bad_alloc();
91 : :
92 : 82506 : return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
93 : : }
94 : :
95 : : // __p is not permitted to be a null pointer.
96 : : void
97 : : deallocate(pointer __p, size_type)
98 : 307348 : { ::operator delete(__p); }
99 : :
100 : : size_type
101 : : max_size() const throw()
102 : 111996 : { return size_t(-1) / sizeof(_Tp); }
103 : :
104 : : // _GLIBCXX_RESOLVE_LIB_DEFECTS
105 : : // 402. wrong new expression in [some_] allocator::construct
106 : : void
107 : : construct(pointer __p, const _Tp& __val)
108 [ # # ][ + - ]: 245569 : { ::new((void *)__p) _Tp(__val); }
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109 : :
110 : : #ifdef __GXX_EXPERIMENTAL_CXX0X__
111 : : template<typename... _Args>
112 : : void
113 : : construct(pointer __p, _Args&&... __args)
114 : : { ::new((void *)__p) _Tp(std::forward<_Args>(__args)...); }
115 : : #endif
116 : :
117 : : void
118 : 563 : destroy(pointer __p) { __p->~_Tp(); }
119 : : };
120 : :
121 : : template<typename _Tp>
122 : : inline bool
123 : : operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
124 : : { return true; }
125 : :
126 : : template<typename _Tp>
127 : : inline bool
128 : : operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
129 : : { return false; }
130 : :
131 : : _GLIBCXX_END_NAMESPACE
132 : :
133 : : #endif
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