Line data    Source code

       1             : // Allocator that wraps operator new -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009
       4             : // Free Software Foundation, Inc.
       5             : //
       6             : // This file is part of the GNU ISO C++ Library.  This library is free
       7             : // software; you can redistribute it and/or modify it under the
       8             : // terms of the GNU General Public License as published by the
       9             : // Free Software Foundation; either version 3, or (at your option)
      10             : // any later version.
      11             : 
      12             : // This library is distributed in the hope that it will be useful,
      13             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             : // GNU General Public License for more details.
      16             : 
      17             : // Under Section 7 of GPL version 3, you are granted additional
      18             : // permissions described in the GCC Runtime Library Exception, version
      19             : // 3.1, as published by the Free Software Foundation.
      20             : 
      21             : // You should have received a copy of the GNU General Public License and
      22             : // a copy of the GCC Runtime Library Exception along with this program;
      23             : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      24             : // <http://www.gnu.org/licenses/>.
      25             : 
      26             : /** @file ext/new_allocator.h
      27             :  *  This file is a GNU extension to the Standard C++ Library.
      28             :  */
      29             : 
      30             : #ifndef _NEW_ALLOCATOR_H
      31             : #define _NEW_ALLOCATOR_H 1
      32             : 
      33             : #include <new>
      34             : #include <bits/functexcept.h>
      35             : #include <bits/move.h>
      36             : 
      37             : _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
      38             : 
      39             :   using std::size_t;
      40             :   using std::ptrdiff_t;
      41             : 
      42             :   /**
      43             :    *  @brief  An allocator that uses global new, as per [20.4].
      44             :    *  @ingroup allocators
      45             :    *
      46             :    *  This is precisely the allocator defined in the C++ Standard. 
      47             :    *    - all allocation calls operator new
      48             :    *    - all deallocation calls operator delete
      49             :    */
      50             :   template<typename _Tp>
      51             :     class new_allocator
      52             :     {
      53             :     public:
      54             :       typedef size_t     size_type;
      55             :       typedef ptrdiff_t  difference_type;
      56             :       typedef _Tp*       pointer;
      57             :       typedef const _Tp* const_pointer;
      58             :       typedef _Tp&       reference;
      59             :       typedef const _Tp& const_reference;
      60             :       typedef _Tp        value_type;
      61             : 
      62             :       template<typename _Tp1>
      63             :         struct rebind
      64             :         { typedef new_allocator<_Tp1> other; };
      65             : 
      66     4400877 :       new_allocator() throw() { }
      67             : 
      68       99621 :       new_allocator(const new_allocator&) throw() { }
      69             : 
      70             :       template<typename _Tp1>
      71             :         new_allocator(const new_allocator<_Tp1>&) throw() { }
      72             : 
      73     4273477 :       ~new_allocator() throw() { }
      74             : 
      75             :       pointer
      76             :       address(reference __x) const { return &__x; }
      77             : 
      78             :       const_pointer
      79             :       address(const_reference __x) const { return &__x; }
      80             : 
      81             :       // NB: __n is permitted to be 0.  The C++ standard says nothing
      82             :       // about what the return value is when __n == 0.
      83             :       pointer
      84     3148578 :       allocate(size_type __n, const void* = 0)
      85             :       { 
      86     3148578 :         if (__builtin_expect(__n > this->max_size(), false))
      87           0 :           std::__throw_bad_alloc();
      88             : 
      89     3148570 :         return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
      90             :       }
      91             : 
      92             :       // __p is not permitted to be a null pointer.
      93             :       void
      94     2852394 :       deallocate(pointer __p, size_type)
      95     2852394 :       { ::operator delete(__p); }
      96             : 
      97             :       size_type
      98     6194688 :       max_size() const throw() 
      99     6194688 :       { return size_t(-1) / sizeof(_Tp); }
     100             : 
     101             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     102             :       // 402. wrong new expression in [some_] allocator::construct
     103             :       void 
     104     3085488 :       construct(pointer __p, const _Tp& __val) 
     105     3085488 :       { ::new((void *)__p) _Tp(__val); }
     106             : 
     107             : #ifdef __GXX_EXPERIMENTAL_CXX0X__
     108             :       template<typename... _Args>
     109             :         void
     110             :         construct(pointer __p, _Args&&... __args)
     111             :         { ::new((void *)__p) _Tp(std::forward<_Args>(__args)...); }
     112             : #endif
     113             : 
     114             :       void 
     115     1329129 :       destroy(pointer __p) { __p->~_Tp(); }
     116             :     };
     117             : 
     118             :   template<typename _Tp>
     119             :     inline bool
     120             :     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     121             :     { return true; }
     122             :   
     123             :   template<typename _Tp>
     124             :     inline bool
     125             :     operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     126             :     { return false; }
     127             : 
     128             : _GLIBCXX_END_NAMESPACE
     129             : 
     130             : #endif