libstdc++-v3/include/bits/stl_uninitialized.h

   1 // Raw memory manipulators -*- C++ -*-
   2
   3 // Copyright (C) 2001, 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 /*
  31  *
  32  * Copyright (c) 1994
  33  * Hewlett-Packard Company
  34  *
  35  * Permission to use, copy, modify, distribute and sell this software
  36  * and its documentation for any purpose is hereby granted without fee,
  37  * provided that the above copyright notice appear in all copies and
  38  * that both that copyright notice and this permission notice appear
  39  * in supporting documentation.  Hewlett-Packard Company makes no
  40  * representations about the suitability of this software for any
  41  * purpose.  It is provided "as is" without express or implied warranty.
  42  *
  43  *
  44  * Copyright (c) 1996,1997
  45  * Silicon Graphics Computer Systems, Inc.
  46  *
  47  * Permission to use, copy, modify, distribute and sell this software
  48  * and its documentation for any purpose is hereby granted without fee,
  49  * provided that the above copyright notice appear in all copies and
  50  * that both that copyright notice and this permission notice appear
  51  * in supporting documentation.  Silicon Graphics makes no
  52  * representations about the suitability of this software for any
  53  * purpose.  It is provided "as is" without express or implied warranty.
  54  */
  55
  56 /** @file stl_uninitialized.h
  57  *  This is an internal header file, included by other library headers.
  58  *  You should not attempt to use it directly.
  59  */
  60
  61 #ifndef _STL_UNINITIALIZED_H
  62 #define _STL_UNINITIALIZED_H 1
  63
  64 #include <cstring>
  65
  66 _GLIBCXX_BEGIN_NAMESPACE(std)
  67
  68   // uninitialized_copy
  69   template<typename _InputIterator, typename _ForwardIterator>
  70     inline _ForwardIterator
  71     __uninitialized_copy_aux(_InputIterator __first, _InputIterator __last,
  72                              _ForwardIterator __result,
  73                              __true_type)
  74     { return std::copy(__first, __last, __result); }
  75
  76   template<typename _InputIterator, typename _ForwardIterator>
  77     inline _ForwardIterator
  78     __uninitialized_copy_aux(_InputIterator __first, _InputIterator __last,
  79                              _ForwardIterator __result,
  80                              __false_type)
  81     {
  82       _ForwardIterator __cur = __result;
  83       try
  84         {
  85           for (; __first != __last; ++__first, ++__cur)
  86             std::_Construct(&*__cur, *__first);
  87           return __cur;
  88         }
  89       catch(...)
  90         {
  91           std::_Destroy(__result, __cur);
  92           __throw_exception_again;
  93         }
  94     }
  95
  96   /**
  97    *  @brief Copies the range [first,last) into result.
  98    *  @param  first  An input iterator.
  99    *  @param  last   An input iterator.
 100    *  @param  result An output iterator.
 101    *  @return   result + (first - last)
 102    *
 103    *  Like copy(), but does not require an initialized output range.
 104   */
 105   template<typename _InputIterator, typename _ForwardIterator>
 106     inline _ForwardIterator
 107     uninitialized_copy(_InputIterator __first, _InputIterator __last,
 108                        _ForwardIterator __result)
 109     {
 110       typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
 111       typedef typename std::__is_scalar<_ValueType>::__type _Is_POD;
 112       return std::__uninitialized_copy_aux(__first, __last, __result,
 113                                            _Is_POD());
 114     }
 115
 116   inline char*
 117   uninitialized_copy(const char* __first, const char* __last, char* __result)
 118   {
 119     std::memmove(__result, __first, __last - __first);
 120     return __result + (__last - __first);
 121   }
 122
 123   inline wchar_t*
 124   uninitialized_copy(const wchar_t* __first, const wchar_t* __last,
 125                      wchar_t* __result)
 126   {
 127     std::memmove(__result, __first, sizeof(wchar_t) * (__last - __first));
 128     return __result + (__last - __first);
 129   }
 130
 131   // Valid if copy construction is equivalent to assignment, and if the
 132   // destructor is trivial.
 133   template<typename _ForwardIterator, typename _Tp>
 134     inline void
 135     __uninitialized_fill_aux(_ForwardIterator __first,
 136                              _ForwardIterator __last,
 137                              const _Tp& __x, __true_type)
 138     { std::fill(__first, __last, __x); }
 139
 140   template<typename _ForwardIterator, typename _Tp>
 141     void
 142     __uninitialized_fill_aux(_ForwardIterator __first, _ForwardIterator __last,
 143                              const _Tp& __x, __false_type)
 144     {
 145       _ForwardIterator __cur = __first;
 146       try
 147         {
 148           for (; __cur != __last; ++__cur)
 149             std::_Construct(&*__cur, __x);
 150         }
 151       catch(...)
 152         {
 153           std::_Destroy(__first, __cur);
 154           __throw_exception_again;
 155         }
 156     }
 157
 158   /**
 159    *  @brief Copies the value x into the range [first,last).
 160    *  @param  first  An input iterator.
 161    *  @param  last   An input iterator.
 162    *  @param  x      The source value.
 163    *  @return   Nothing.
 164    *
 165    *  Like fill(), but does not require an initialized output range.
 166   */
 167   template<typename _ForwardIterator, typename _Tp>
 168     inline void
 169     uninitialized_fill(_ForwardIterator __first, _ForwardIterator __last,
 170                        const _Tp& __x)
 171     {
 172       typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
 173       typedef typename std::__is_scalar<_ValueType>::__type _Is_POD;
 174       std::__uninitialized_fill_aux(__first, __last, __x, _Is_POD());
 175     }
 176
 177   // Valid if copy construction is equivalent to assignment, and if the
 178   //  destructor is trivial.
 179   template<typename _ForwardIterator, typename _Size, typename _Tp>
 180     inline void
 181     __uninitialized_fill_n_aux(_ForwardIterator __first, _Size __n,
 182                                const _Tp& __x, __true_type)
 183     { std::fill_n(__first, __n, __x); }
 184
 185   template<typename _ForwardIterator, typename _Size, typename _Tp>
 186     void
 187     __uninitialized_fill_n_aux(_ForwardIterator __first, _Size __n,
 188                                const _Tp& __x, __false_type)
 189     {
 190       _ForwardIterator __cur = __first;
 191       try
 192         {
 193           for (; __n > 0; --__n, ++__cur)
 194             std::_Construct(&*__cur, __x);
 195         }
 196       catch(...)
 197         {
 198           std::_Destroy(__first, __cur);
 199           __throw_exception_again;
 200         }
 201     }
 202
 203   /**
 204    *  @brief Copies the value x into the range [first,first+n).
 205    *  @param  first  An input iterator.
 206    *  @param  n      The number of copies to make.
 207    *  @param  x      The source value.
 208    *  @return   Nothing.
 209    *
 210    *  Like fill_n(), but does not require an initialized output range.
 211   */
 212   template<typename _ForwardIterator, typename _Size, typename _Tp>
 213     inline void
 214     uninitialized_fill_n(_ForwardIterator __first, _Size __n, const _Tp& __x)
 215     {
 216       typedef typename iterator_traits<_ForwardIterator>::value_type _ValueType;
 217       typedef typename std::__is_scalar<_ValueType>::__type _Is_POD;
 218       std::__uninitialized_fill_n_aux(__first, __n, __x, _Is_POD());
 219     }
 220
 221   // Extensions: versions of uninitialized_copy, uninitialized_fill,
 222   //  and uninitialized_fill_n that take an allocator parameter.
 223   //  We dispatch back to the standard versions when we're given the
 224   //  default allocator.  For nondefault allocators we do not use
 225   //  any of the POD optimizations.
 226
 227   template<typename _InputIterator, typename _ForwardIterator,
 228            typename _Allocator>
 229     _ForwardIterator
 230     __uninitialized_copy_a(_InputIterator __first, _InputIterator __last,
 231                            _ForwardIterator __result,
 232                            _Allocator __alloc)
 233     {
 234       _ForwardIterator __cur = __result;
 235       try
 236         {
 237           for (; __first != __last; ++__first, ++__cur)
 238             __alloc.construct(&*__cur, *__first);
 239           return __cur;
 240         }
 241       catch(...)
 242         {
 243           std::_Destroy(__result, __cur, __alloc);
 244           __throw_exception_again;
 245         }
 246     }
 247
 248   template<typename _InputIterator, typename _ForwardIterator, typename _Tp>
 249     inline _ForwardIterator
 250     __uninitialized_copy_a(_InputIterator __first, _InputIterator __last,
 251                            _ForwardIterator __result,
 252                            allocator<_Tp>)
 253     {
 254       return std::uninitialized_copy(__first, __last, __result);
 255     }
 256
 257   template<typename _ForwardIterator, typename _Tp, typename _Allocator>
 258     void
 259     __uninitialized_fill_a(_ForwardIterator __first, _ForwardIterator __last,
 260                            const _Tp& __x, _Allocator __alloc)
 261     {
 262       _ForwardIterator __cur = __first;
 263       try
 264         {
 265           for (; __cur != __last; ++__cur)
 266             __alloc.construct(&*__cur, __x);
 267         }
 268       catch(...)
 269         {
 270           std::_Destroy(__first, __cur, __alloc);
 271           __throw_exception_again;
 272         }
 273     }
 274
 275   template<typename _ForwardIterator, typename _Tp, typename _Tp2>
 276     inline void
 277     __uninitialized_fill_a(_ForwardIterator __first, _ForwardIterator __last,
 278                            const _Tp& __x, allocator<_Tp2>)
 279     {
 280       std::uninitialized_fill(__first, __last, __x);
 281     }
 282
 283   template<typename _ForwardIterator, typename _Size, typename _Tp,
 284            typename _Allocator>
 285     void
 286     __uninitialized_fill_n_a(_ForwardIterator __first, _Size __n,
 287                              const _Tp& __x,
 288                              _Allocator __alloc)
 289     {
 290       _ForwardIterator __cur = __first;
 291       try
 292         {
 293           for (; __n > 0; --__n, ++__cur)
 294             __alloc.construct(&*__cur, __x);
 295         }
 296       catch(...)
 297         {
 298           std::_Destroy(__first, __cur, __alloc);
 299           __throw_exception_again;
 300         }
 301     }
 302
 303   template<typename _ForwardIterator, typename _Size, typename _Tp,
 304            typename _Tp2>
 305     void
 306     __uninitialized_fill_n_a(_ForwardIterator __first, _Size __n,
 307                              const _Tp& __x,
 308                              allocator<_Tp2>)
 309     {
 310       std::uninitialized_fill_n(__first, __n, __x);
 311     }
 312
 313
 314   // Extensions: __uninitialized_copy_copy, __uninitialized_copy_fill,
 315   // __uninitialized_fill_copy.  All of these algorithms take a user-
 316   // supplied allocator, which is used for construction and destruction.
 317
 318   // __uninitialized_copy_copy
 319   // Copies [first1, last1) into [result, result + (last1 - first1)), and
 320   //  copies [first2, last2) into
 321   //  [result, result + (last1 - first1) + (last2 - first2)).
 322
 323   template<typename _InputIterator1, typename _InputIterator2,
 324            typename _ForwardIterator, typename _Allocator>
 325     inline _ForwardIterator
 326     __uninitialized_copy_copy(_InputIterator1 __first1,
 327                               _InputIterator1 __last1,
 328                               _InputIterator2 __first2,
 329                               _InputIterator2 __last2,
 330                               _ForwardIterator __result,
 331                               _Allocator __alloc)
 332     {
 333       _ForwardIterator __mid = std::__uninitialized_copy_a(__first1, __last1,
 334                                                            __result,
 335                                                            __alloc);
 336       try
 337         {
 338           return std::__uninitialized_copy_a(__first2, __last2, __mid, __alloc);
 339         }
 340       catch(...)
 341         {
 342           std::_Destroy(__result, __mid, __alloc);
 343           __throw_exception_again;
 344         }
 345     }
 346
 347   // __uninitialized_fill_copy
 348   // Fills [result, mid) with x, and copies [first, last) into
 349   //  [mid, mid + (last - first)).
 350   template<typename _ForwardIterator, typename _Tp, typename _InputIterator,
 351            typename _Allocator>
 352     inline _ForwardIterator
 353     __uninitialized_fill_copy(_ForwardIterator __result, _ForwardIterator __mid,
 354                               const _Tp& __x, _InputIterator __first,
 355                               _InputIterator __last,
 356                               _Allocator __alloc)
 357     {
 358       std::__uninitialized_fill_a(__result, __mid, __x, __alloc);
 359       try
 360         {
 361           return std::__uninitialized_copy_a(__first, __last, __mid, __alloc);
 362         }
 363       catch(...)
 364         {
 365           std::_Destroy(__result, __mid, __alloc);
 366           __throw_exception_again;
 367         }
 368     }
 369
 370   // __uninitialized_copy_fill
 371   // Copies [first1, last1) into [first2, first2 + (last1 - first1)), and
 372   //  fills [first2 + (last1 - first1), last2) with x.
 373   template<typename _InputIterator, typename _ForwardIterator, typename _Tp,
 374            typename _Allocator>
 375     inline void
 376     __uninitialized_copy_fill(_InputIterator __first1, _InputIterator __last1,
 377                               _ForwardIterator __first2,
 378                               _ForwardIterator __last2, const _Tp& __x,
 379                               _Allocator __alloc)
 380     {
 381       _ForwardIterator __mid2 = std::__uninitialized_copy_a(__first1, __last1,
 382                                                             __first2,
 383                                                             __alloc);
 384       try
 385         {
 386           std::__uninitialized_fill_a(__mid2, __last2, __x, __alloc);
 387         }
 388       catch(...)
 389         {
 390           std::_Destroy(__first2, __mid2, __alloc);
 391           __throw_exception_again;
 392         }
 393     }
 394
 395 _GLIBCXX_END_NAMESPACE
 396
 397 #endif /* _STL_UNINITIALIZED_H */