ext/memory

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00001 // Memory extensions -*- C++ -*-
00002 
00003 // Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  *
00032  * Copyright (c) 1994
00033  * Hewlett-Packard Company
00034  *
00035  * Permission to use, copy, modify, distribute and sell this software
00036  * and its documentation for any purpose is hereby granted without fee,
00037  * provided that the above copyright notice appear in all copies and
00038  * that both that copyright notice and this permission notice appear
00039  * in supporting documentation.  Hewlett-Packard Company makes no
00040  * representations about the suitability of this software for any
00041  * purpose.  It is provided "as is" without express or implied warranty.
00042  *
00043  *
00044  * Copyright (c) 1996
00045  * Silicon Graphics Computer Systems, Inc.
00046  *
00047  * Permission to use, copy, modify, distribute and sell this software
00048  * and its documentation for any purpose is hereby granted without fee,
00049  * provided that the above copyright notice appear in all copies and
00050  * that both that copyright notice and this permission notice appear
00051  * in supporting documentation.  Silicon Graphics makes no
00052  * representations about the suitability of this software for any
00053  * purpose.  It is provided "as is" without express or implied warranty.
00054  */
00055 
00056 /** @file ext/memory
00057  *  This file is a GNU extension to the Standard C++ Library (possibly
00058  *  containing extensions from the HP/SGI STL subset).
00059  */
00060 
00061 #ifndef _EXT_MEMORY
00062 #define _EXT_MEMORY 1
00063 
00064 #pragma GCC system_header
00065 
00066 #include <memory>
00067 #include <bits/stl_tempbuf.h>
00068 
00069 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
00070 
00071   using std::ptrdiff_t;
00072   using std::pair;
00073   using std::__iterator_category;
00074   using std::_Temporary_buffer;
00075 
00076   template<typename _InputIter, typename _Size, typename _ForwardIter>
00077     pair<_InputIter, _ForwardIter>
00078     __uninitialized_copy_n(_InputIter __first, _Size __count,
00079                _ForwardIter __result, std::input_iterator_tag)
00080     {
00081       _ForwardIter __cur = __result;
00082       try
00083     {
00084       for (; __count > 0 ; --__count, ++__first, ++__cur)
00085         std::_Construct(&*__cur, *__first);
00086       return pair<_InputIter, _ForwardIter>(__first, __cur);
00087     }
00088       catch(...)
00089     {
00090       std::_Destroy(__result, __cur);
00091       __throw_exception_again;
00092     }
00093     }
00094 
00095   template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
00096     inline pair<_RandomAccessIter, _ForwardIter>
00097     __uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
00098                _ForwardIter __result,
00099                std::random_access_iterator_tag)
00100     {
00101       _RandomAccessIter __last = __first + __count;
00102       return (pair<_RandomAccessIter, _ForwardIter>
00103           (__last, std::uninitialized_copy(__first, __last, __result)));
00104     }
00105 
00106   template<typename _InputIter, typename _Size, typename _ForwardIter>
00107     inline pair<_InputIter, _ForwardIter>
00108     __uninitialized_copy_n(_InputIter __first, _Size __count,
00109              _ForwardIter __result)
00110     { return __uninitialized_copy_n(__first, __count, __result,
00111                     __iterator_category(__first)); }
00112 
00113   /**
00114    *  @brief Copies the range [first,last) into result.
00115    *  @param  first  An input iterator.
00116    *  @param  last   An input iterator.
00117    *  @param  result An output iterator.
00118    *  @return   result + (first - last)
00119    *  @ingroup SGIextensions
00120    *
00121    *  Like copy(), but does not require an initialized output range.
00122   */
00123   template<typename _InputIter, typename _Size, typename _ForwardIter>
00124     inline pair<_InputIter, _ForwardIter>
00125     uninitialized_copy_n(_InputIter __first, _Size __count,
00126              _ForwardIter __result)
00127     { return __uninitialized_copy_n(__first, __count, __result,
00128                     __iterator_category(__first)); }
00129 
00130 
00131   // An alternative version of uninitialized_copy_n that constructs
00132   // and destroys objects with a user-provided allocator.
00133   template<typename _InputIter, typename _Size, typename _ForwardIter,
00134            typename _Allocator>
00135     pair<_InputIter, _ForwardIter>
00136     __uninitialized_copy_n_a(_InputIter __first, _Size __count,
00137                  _ForwardIter __result,
00138                  _Allocator __alloc)
00139     {
00140       _ForwardIter __cur = __result;
00141       try
00142     {
00143       for (; __count > 0 ; --__count, ++__first, ++__cur)
00144         __alloc.construct(&*__cur, *__first);
00145       return pair<_InputIter, _ForwardIter>(__first, __cur);
00146     }
00147       catch(...)
00148     {
00149       std::_Destroy(__result, __cur, __alloc);
00150       __throw_exception_again;
00151     }
00152     }
00153 
00154   template<typename _InputIter, typename _Size, typename _ForwardIter,
00155            typename _Tp>
00156     inline pair<_InputIter, _ForwardIter>
00157     __uninitialized_copy_n_a(_InputIter __first, _Size __count,
00158                  _ForwardIter __result,
00159                  std::allocator<_Tp>)
00160     {
00161       return uninitialized_copy_n(__first, __count, __result);
00162     }
00163 
00164   /**
00165    *  This class provides similar behavior and semantics of the standard
00166    *  functions get_temporary_buffer() and return_temporary_buffer(), but
00167    *  encapsulated in a type vaguely resembling a standard container.
00168    *
00169    *  By default, a temporary_buffer<Iter> stores space for objects of
00170    *  whatever type the Iter iterator points to.  It is constructed from a
00171    *  typical [first,last) range, and provides the begin(), end(), size()
00172    *  functions, as well as requested_size().  For non-trivial types, copies
00173    *  of *first will be used to initialize the storage.
00174    *
00175    *  @c malloc is used to obtain underlying storage.
00176    *
00177    *  Like get_temporary_buffer(), not all the requested memory may be
00178    *  available.  Ideally, the created buffer will be large enough to hold a
00179    *  copy of [first,last), but if size() is less than requested_size(),
00180    *  then this didn't happen.
00181    *
00182    *  @ingroup SGIextensions
00183   */
00184   template <class _ForwardIterator, class _Tp
00185         = typename std::iterator_traits<_ForwardIterator>::value_type >
00186     struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
00187     {
00188       /// Requests storage large enough to hold a copy of [first,last).
00189       temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
00190       : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { }
00191       
00192       /// Destroys objects and frees storage.
00193       ~temporary_buffer() { }
00194     };
00195 
00196 _GLIBCXX_END_NAMESPACE
00197 
00198 #endif
00199 

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