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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 : #ifndef INCLUDED_RTL_ALLOCATOR_HXX
20 : #define INCLUDED_RTL_ALLOCATOR_HXX
21 :
22 : #include "sal/types.h"
23 : #include "rtl/alloc.h"
24 : #include <cstddef>
25 :
26 : /// @cond INTERNAL
27 :
28 : //######################################################
29 : // This is no general purpose STL allocator but one
30 : // necessary to use STL for some implementation but
31 : // avoid linking sal against the STLPort library!!!
32 : // For more information on when and how to define a
33 : // custom stl allocator have a look at Scott Meyers:
34 : // "Effective STL", Nicolai M. Josuttis:
35 : // "The C++ Standard Library - A Tutorial and Reference"
36 : // and at http://www.josuttis.com/cppcode/allocator.html
37 :
38 : namespace rtl {
39 :
40 : template<class T>
41 : class Allocator
42 : {
43 : public:
44 : typedef T value_type;
45 : typedef T* pointer;
46 : typedef const T* const_pointer;
47 : typedef T& reference;
48 : typedef const T& const_reference;
49 : typedef ::std::size_t size_type;
50 : typedef ::std::ptrdiff_t difference_type;
51 :
52 : //-----------------------------------------
53 : template<class U>
54 : struct rebind
55 : {
56 : typedef Allocator<U> other;
57 : };
58 :
59 : //-----------------------------------------
60 : pointer address (reference value) const
61 : {
62 : return &value;
63 : }
64 :
65 : //-----------------------------------------
66 : const_pointer address (const_reference value) const
67 : {
68 : return &value;
69 : }
70 :
71 : //-----------------------------------------
72 3861 : Allocator() SAL_THROW(())
73 3861 : {}
74 :
75 : //-----------------------------------------
76 : template<class U>
77 2412 : Allocator (SAL_UNUSED_PARAMETER const Allocator<U>&) SAL_THROW(())
78 2412 : {}
79 :
80 : //-----------------------------------------
81 2206 : Allocator(const Allocator&) SAL_THROW(())
82 2206 : {}
83 :
84 : //-----------------------------------------
85 6677 : ~Allocator() SAL_THROW(())
86 6677 : {}
87 :
88 : //-----------------------------------------
89 212 : size_type max_size() const SAL_THROW(())
90 : {
91 212 : return size_type(-1)/sizeof(T);
92 : }
93 :
94 : //-----------------------------------------
95 : /* Normally the code for allocate should
96 : throw a std::bad_alloc exception if the
97 : requested memory could not be allocated:
98 : (C++ standard 20.4.1.1):
99 :
100 : pointer allocate (size_type n, const void* hint = 0)
101 : {
102 : pointer p = reinterpret_cast<pointer>(
103 : rtl_allocateMemory(sal_uInt32(n * sizeof(T))));
104 :
105 : if (NULL == p)
106 : throw ::std::bad_alloc();
107 :
108 : return p;
109 : }
110 :
111 : but some compilers do not compile it if exceptions
112 : are not enabled, e.g. GCC under Linux and it is
113 : in general not desired to compile sal with exceptions
114 : enabled. */
115 16112 : pointer allocate (size_type n, SAL_UNUSED_PARAMETER const void* = 0)
116 : {
117 : return reinterpret_cast<pointer>(
118 16112 : rtl_allocateMemory(sal_uInt32(n * sizeof(T))));
119 : }
120 :
121 : //-----------------------------------------
122 10342 : void deallocate (pointer p, SAL_UNUSED_PARAMETER size_type /* n */)
123 : {
124 10342 : rtl_freeMemory(p);
125 10342 : }
126 :
127 : //-----------------------------------------
128 36786 : void construct (pointer p, const T& value)
129 : {
130 36786 : new ((void*)p)T(value);
131 36786 : }
132 :
133 : //-----------------------------------------
134 26792 : void destroy (pointer p)
135 : {
136 22605 : p->~T();
137 : (void)p; //MSVC2005 annoyingly warns this is unused
138 26792 : }
139 : };
140 :
141 : //######################################################
142 : // Custom STL allocators must be stateless (see
143 : // references above) that's why the operators below
144 : // return always true or false
145 :
146 : template<class T, class U> inline bool operator ==(
147 : SAL_UNUSED_PARAMETER const Allocator<T>&,
148 : SAL_UNUSED_PARAMETER const Allocator<U>&) SAL_THROW(())
149 : {
150 : return true;
151 : }
152 :
153 : template<class T, class U>
154 : inline bool operator!= (const Allocator<T>&, const Allocator<U>&) SAL_THROW(())
155 : {
156 : return false;
157 : }
158 :
159 : } /* namespace rtl */
160 :
161 : /** REQUIRED BY STLPort (see stlport '_alloc.h'):
162 : Hack for compilers that do not support member
163 : template classes (e.g. MSVC 6)
164 : */
165 : namespace _STL
166 : {
167 : template<class T, class U>
168 : inline ::rtl::Allocator<U> & __stl_alloc_rebind (::rtl::Allocator<T> & a, U const *)
169 : {
170 : return (::rtl::Allocator<U>&)(a);
171 : }
172 : }
173 :
174 : /// @endcond
175 :
176 : #endif /* INCLUDED_RTL_ALLOCATOR_HXX */
177 :
178 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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