# ext/memory

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    00001 // Memory extensions -*- C++ -*-
    00002
    00003 // Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
    00004 // Free Software Foundation, Inc.
    00005 //
    00006 // This file is part of the GNU ISO C++ Library.  This library is free
    00007 // software; you can redistribute it and/or modify it under the
    00008 // terms of the GNU General Public License as published by the
    00009 // Free Software Foundation; either version 3, or (at your option)
    00010 // any later version.
    00011
    00012 // This library is distributed in the hope that it will be useful,
    00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015 // GNU General Public License for more details.
    00016
    00017 // Under Section 7 of GPL version 3, you are granted additional
    00018 // permissions described in the GCC Runtime Library Exception, version
    00019 // 3.1, as published by the Free Software Foundation.
    00020
    00021 // You should have received a copy of the GNU General Public License and
    00022 // a copy of the GCC Runtime Library Exception along with this program;
    00023 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    00024 // <http://www.gnu.org/licenses/>.
    00025
    00026 /*
    00027  *
    00028  * Copyright (c) 1994
    00029  * Hewlett-Packard Company
    00030  *
    00031  * Permission to use, copy, modify, distribute and sell this software
    00032  * and its documentation for any purpose is hereby granted without fee,
    00033  * provided that the above copyright notice appear in all copies and
    00034  * that both that copyright notice and this permission notice appear
    00035  * in supporting documentation.  Hewlett-Packard Company makes no
    00036  * representations about the suitability of this software for any
    00037  * purpose.  It is provided "as is" without express or implied warranty.
    00038  *
    00039  *
    00040  * Copyright (c) 1996
    00041  * Silicon Graphics Computer Systems, Inc.
    00042  *
    00043  * Permission to use, copy, modify, distribute and sell this software
    00044  * and its documentation for any purpose is hereby granted without fee,
    00045  * provided that the above copyright notice appear in all copies and
    00046  * that both that copyright notice and this permission notice appear
    00047  * in supporting documentation.  Silicon Graphics makes no
    00048  * representations about the suitability of this software for any
    00049  * purpose.  It is provided "as is" without express or implied warranty.
    00050  */
    00051
    00052 /** @file ext/memory
    00053  *  This file is a GNU extension to the Standard C++ Library (possibly
    00054  *  containing extensions from the HP/SGI STL subset).
    00055  */
    00056
    00057 #ifndef _EXT_MEMORY
    00058 #define _EXT_MEMORY 1
    00059
    00060 #pragma GCC system_header
    00061
    00062 #include <memory>
    00063 #include <bits/stl_tempbuf.h>
    00064
    00065 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
    00066
    00067   using std::ptrdiff_t;
    00068   using std::pair;
    00069   using std::__iterator_category;
    00070   using std::_Temporary_buffer;
    00071
    00072   template<typename _InputIter, typename _Size, typename _ForwardIter>
    00073     pair<_InputIter, _ForwardIter>
    00074     __uninitialized_copy_n(_InputIter __first, _Size __count,
    00075                _ForwardIter __result, std::input_iterator_tag)
    00076     {
    00077       _ForwardIter __cur = __result;
    00078       __try
    00079     {
    00080       for (; __count > 0 ; --__count, ++__first, ++__cur)
    00081         std::_Construct(&*__cur, *__first);
    00082       return pair<_InputIter, _ForwardIter>(__first, __cur);
    00083     }
    00084       __catch(...)
    00085     {
    00086       std::_Destroy(__result, __cur);
    00087       __throw_exception_again;
    00088     }
    00089     }
    00090
    00091   template<typename _RandomAccessIter, typename _Size, typename _ForwardIter>
    00092     inline pair<_RandomAccessIter, _ForwardIter>
    00093     __uninitialized_copy_n(_RandomAccessIter __first, _Size __count,
    00094                _ForwardIter __result,
    00095                std::random_access_iterator_tag)
    00096     {
    00097       _RandomAccessIter __last = __first + __count;
    00098       return (pair<_RandomAccessIter, _ForwardIter>
    00099           (__last, std::uninitialized_copy(__first, __last, __result)));
    00100     }
    00101
    00102   template<typename _InputIter, typename _Size, typename _ForwardIter>
    00103     inline pair<_InputIter, _ForwardIter>
    00104     __uninitialized_copy_n(_InputIter __first, _Size __count,
    00105              _ForwardIter __result)
    00106     { return __uninitialized_copy_n(__first, __count, __result,
    00107                     __iterator_category(__first)); }
    00108
    00109   /**
    00110    *  @brief Copies the range [first,last) into result.
    00111    *  @param  first  An input iterator.
    00112    *  @param  last   An input iterator.
    00113    *  @param  result An output iterator.
    00114    *  @return   result + (first - last)
    00115    *  @ingroup SGIextensions
    00116    *
    00117    *  Like copy(), but does not require an initialized output range.
    00118   */
    00119   template<typename _InputIter, typename _Size, typename _ForwardIter>
    00120     inline pair<_InputIter, _ForwardIter>
    00121     uninitialized_copy_n(_InputIter __first, _Size __count,
    00122              _ForwardIter __result)
    00123     { return __uninitialized_copy_n(__first, __count, __result,
    00124                     __iterator_category(__first)); }
    00125
    00126
    00127   // An alternative version of uninitialized_copy_n that constructs
    00128   // and destroys objects with a user-provided allocator.
    00129   template<typename _InputIter, typename _Size, typename _ForwardIter,
    00130            typename _Allocator>
    00131     pair<_InputIter, _ForwardIter>
    00132     __uninitialized_copy_n_a(_InputIter __first, _Size __count,
    00133                  _ForwardIter __result,
    00134                  _Allocator __alloc)
    00135     {
    00136       _ForwardIter __cur = __result;
    00137       __try
    00138     {
    00139       for (; __count > 0 ; --__count, ++__first, ++__cur)
    00140         __alloc.construct(&*__cur, *__first);
    00141       return pair<_InputIter, _ForwardIter>(__first, __cur);
    00142     }
    00143       __catch(...)
    00144     {
    00145       std::_Destroy(__result, __cur, __alloc);
    00146       __throw_exception_again;
    00147     }
    00148     }
    00149
    00150   template<typename _InputIter, typename _Size, typename _ForwardIter,
    00151            typename _Tp>
    00152     inline pair<_InputIter, _ForwardIter>
    00153     __uninitialized_copy_n_a(_InputIter __first, _Size __count,
    00154                  _ForwardIter __result,
    00155                  std::allocator<_Tp>)
    00156     {
    00157       return uninitialized_copy_n(__first, __count, __result);
    00158     }
    00159
    00160   /**
    00161    *  This class provides similar behavior and semantics of the standard
    00162    *  functions get_temporary_buffer() and return_temporary_buffer(), but
    00163    *  encapsulated in a type vaguely resembling a standard container.
    00164    *
    00165    *  By default, a temporary_buffer<Iter> stores space for objects of
    00166    *  whatever type the Iter iterator points to.  It is constructed from a
    00167    *  typical [first,last) range, and provides the begin(), end(), size()
    00168    *  functions, as well as requested_size().  For non-trivial types, copies
    00169    *  of *first will be used to initialize the storage.
    00170    *
    00171    *  @c malloc is used to obtain underlying storage.
    00172    *
    00173    *  Like get_temporary_buffer(), not all the requested memory may be
    00174    *  available.  Ideally, the created buffer will be large enough to hold a
    00175    *  copy of [first,last), but if size() is less than requested_size(),
    00176    *  then this didn't happen.
    00177    *
    00178    *  @ingroup SGIextensions
    00179   */
    00180   template <class _ForwardIterator, class _Tp
    00181         = typename std::iterator_traits<_ForwardIterator>::value_type >
    00182     struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
    00183     {
    00184       /// Requests storage large enough to hold a copy of [first,last).
    00185       temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
    00186       : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) { }
    00187
    00188       /// Destroys objects and frees storage.
    00189       ~temporary_buffer() { }
    00190     };
    00191
    00192 _GLIBCXX_END_NAMESPACE
    00193
    00194 #endif
    00195