/usr/include/libmesh/auto_ptr.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 | // $Id: auto_ptr.h 3874 2010-07-02 21:57:26Z roystgnr $
// Copyright (C) 2001, 2002 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)
// 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.
// 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// 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.
/*
* Copyright (c) 1997-1999
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*/
#ifndef __auto_ptr_h__
#define __auto_ptr_h__
namespace libMesh
{
/**
* A wrapper class to provide AutoPtr with reference semantics. For
* example, an AutoPtr can be assigned (or constructed from) the result of
* a function which returns an AutoPtr by value.
*
* All the AutoPtrRef stuff should happen behind the scenes.
*/
template<typename Tp1>
struct AutoPtrRef
{
/**
* The actual pointer.
*/
Tp1* _ptr;
/**
* Constructor.
*/
explicit
AutoPtrRef(Tp1* p)
: _ptr(p) {}
};
/**
* @brief A simple smart pointer providing strict ownership semantics.
*
* The Standard says:
* <pre>
* An @c AutoPtr owns the object it holds a pointer to. Copying an
* @c AutoPtr copies the pointer and transfers ownership to the destination.
* If more than one @c AutoPtr owns the same object at the same time the
* behavior of the program is undefined.
*
* The uses of @c AutoPtr include providing temporary exception-safety for
* dynamically allocated memory, passing ownership of dynamically allocated
* memory to a function, and returning dynamically allocated memory from a
* function. @c AutoPtr does not meet the CopyConstructible and Assignable
* requirements for Standard Library <a href="tables.html#65">container</a>
* elements and thus instantiating a Standard Library container with an
* @c AutoPtr results in undefined behavior.
* </pre>
* Quoted from [20.4.5]/3.
*
* This class is adopted from the GCC 3.2.1 source tree and should
* function as a replacement for \p std::auto_ptr<>. Unfortunately
* the \p std::auto_ptr<> is not particularly portable since various
* compilers implement various revisions of the standard. Using
* \p AutoPtr<> instead of \p std::auto_ptr<> allows for easy
* portability.
*/
template<typename Tp>
class AutoPtr
{
private:
/**
* The actual dumb pointer this class wraps.
*/
Tp* _ptr;
public:
/**
* The pointed-to type.
*/
typedef Tp element_type;
/**
* @brief An %AutoPtr is usually constructed from a raw pointer.
* @param p A pointer (defaults to NULL).
*
* This object now @e owns the object pointed to by @a p.
*/
explicit
AutoPtr(element_type* p = 0)
: _ptr(p) {}
/**
* @brief An %AutoPtr can be constructed from another %AutoPtr.
* @param a Another %AutoPtr of the same type.
*
* This object now @e owns the object previously owned by @a a, which has
* given up ownsership.
*/
AutoPtr(AutoPtr& a)
: _ptr(a.release()) {}
/**
* @brief An %AutoPtr can be constructed from another %AutoPtr.
* @param a Another %AutoPtr of a different but related type.
*
* A pointer-to-Tp1 must be convertible to a pointer-to-Tp/element_type.
*
* This object now @e owns the object previously owned by @a a, which has
* given up ownsership.
*/
template<typename Tp1>
AutoPtr(AutoPtr<Tp1>& a)
: _ptr(a.release()) {}
/**
* @brief %AutoPtr assignment operator.
* @param a Another %AutoPtr of the same type.
*
* This object now @e owns the object previously owned by @a a, which has
* given up ownsership. The object that this one @e used to own and
* track has been deleted.
*/
AutoPtr&
operator=(AutoPtr& a)
{
reset(a.release());
return *this;
}
/**
* @brief %AutoPtr assignment operator.
* @param a Another %AutoPtr of a different but related type.
*
* A pointer-to-Tp1 must be convertible to a pointer-to-Tp/element_type.
*
* This object now @e owns the object previously owned by @a a, which has
* given up ownsership. The object that this one @e used to own and
* track has been deleted.
*/
template <typename Tp1>
AutoPtr&
operator=(AutoPtr<Tp1>& a)
{
reset(a.release());
return *this;
}
/**
* When the %AutoPtr goes out of scope, the object it owns is deleted.
* If it no longer owns anything (i.e., @c get() is @c NULL), then this
* has no effect.
*
* @if maint
* The C++ standard says there is supposed to be an empty throw
* specification here, but omitting it is standard conforming. Its
* presence can be detected only if _Tp::~_Tp() throws, but this is
* prohibited. [17.4.3.6]/2
* @endif maint
*/
~AutoPtr() { delete _ptr; }
/**
* @brief Smart pointer dereferencing.
*
* If this %AutoPtr no longer owns anything, then this operation will
* crash. (For a smart pointer, "no longer owns anything" is the same as
* being a null pointer, and you know what happens when you dereference
* one of those...)
*/
element_type&
operator*() const { return *_ptr; }
/**
* @brief Smart pointer dereferencing.
*
* This returns the pointer itself, which the language then will
* automatically cause to be dereferenced.
*/
element_type*
operator->() const { return _ptr; }
/**
* @brief Bypassing the smart pointer.
* @return The raw pointer being managed.
*
* You can get a copy of the pointer that this object owns, for
* situations such as passing to a function which only accepts a raw
* pointer.
*
* @note This %AutoPtr still owns the memory.
*/
element_type*
get() const { return _ptr; }
/**
* @brief Bypassing the smart pointer.
* @return The raw pointer being managed.
*
* You can get a copy of the pointer that this object owns, for
* situations such as passing to a function which only accepts a raw
* pointer.
*
* @note This %AutoPtr no longer owns the memory. When this object
* goes out of scope, nothing will happen.
*/
element_type*
release()
{
element_type* tmp = _ptr;
_ptr = 0;
return tmp;
}
/**
* @brief Forcibly deletes the managed object.
* @param p A pointer (defaults to NULL).
*
* This object now @e owns the object pointed to by @a p. The previous
* object has been deleted.
*/
void
reset(element_type* p = 0)
{
if (p != _ptr)
{
delete _ptr;
_ptr = p;
}
}
/** @{
* @brief Automatic conversions
*
* These operations convert an %AutoPtr into and from an AutoPtrRef
* automatically as needed. This allows constructs such as
* @code
* AutoPtr<Derived> func_returning_AutoPtr(.....);
* ...
* AutoPtr<Base> ptr = func_returning_AutoPtr(.....);
* @endcode
*/
AutoPtr(AutoPtrRef<element_type> ref)
: _ptr(ref._ptr) {}
/**
* op= for AutoPtr. Allows you to write:
* @code
* AutoPtr<Base> ptr = func_returning_AutoPtr(.....);
* @endcode
*/
AutoPtr&
operator=(AutoPtrRef<element_type> ref)
{
if (ref._ptr != this->get())
{
delete _ptr;
_ptr = ref._ptr;
}
return *this;
}
/**
* op() for AutoPtrRef<Tp1>. Calls the release member.
*/
template<typename Tp1>
operator AutoPtrRef<Tp1>()
{ return AutoPtrRef<Tp1>(this->release()); }
/**
* op() for AutoPtr<Tp1>. Calls the release member.
*/
template<typename Tp1>
operator AutoPtr<Tp1>()
{ return AutoPtr<Tp1>(this->release()); }
};
} // namespace libMesh
#endif /* __auto_ptr_h__ */
|