1                 : // Allocator that wraps operator new -*- C++ -*-
       2                 : 
       3                 : // Copyright (C) 2001, 2002, 2003, 2004 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                 : /** @file ext/new_allocator.h
      31                 :  *  This file is a GNU extension to the Standard C++ Library.
      32                 :  */
      33                 : 
      34                 : #ifndef _NEW_ALLOCATOR_H
      35                 : #define _NEW_ALLOCATOR_H 1
      36                 : 
      37                 : #include <new>
      38                 : #include <bits/functexcept.h>
      39                 : 
      40                 : namespace __gnu_cxx
      41                 : {
      42                 :   /**
      43                 :    *  @brief  An allocator that uses global new, as per [20.4].
      44                 :    *
      45                 :    *  This is precisely the allocator defined in the C++ Standard. 
      46                 :    *    - all allocation calls operator new
      47                 :    *    - all deallocation calls operator delete
      48                 :    */
      49                 :   template<typename _Tp>
      50                 :     class new_allocator
      51                 :     {
      52                 :     public:
      53                 :       typedef size_t     size_type;
      54                 :       typedef ptrdiff_t  difference_type;
      55                 :       typedef _Tp*       pointer;
      56                 :       typedef const _Tp* const_pointer;
      57                 :       typedef _Tp&       reference;
      58                 :       typedef const _Tp& const_reference;
      59                 :       typedef _Tp        value_type;
      60                 : 
      61                 :       template<typename _Tp1>
      62                 :         struct rebind
      63                 :         { typedef new_allocator<_Tp1> other; };
      64                 : 
      65        75750112 :       new_allocator() throw() { }
      66                 : 
      67       210890557 :       new_allocator(const new_allocator&) throw() { }
      68                 : 
      69                 :       template<typename _Tp1>
      70                 :         new_allocator(const new_allocator<_Tp1>&) throw() { }
      71                 : 
      72       263944751 :       ~new_allocator() throw() { }
      73                 : 
      74                 :       pointer
      75                 :       address(reference __x) const { return &__x; }
      76                 : 
      77                 :       const_pointer
      78                 :       address(const_reference __x) const { return &__x; }
      79                 : 
      80                 :       // NB: __n is permitted to be 0.  The C++ standard says nothing
      81                 :       // about what the return value is when __n == 0.
      82                 :       pointer
      83        60245449 :       allocate(size_type __n, const void* = 0)
      84                 :       { 
      85        60245449 :         if (__builtin_expect(__n > this->max_size(), false))
      86               0 :           std::__throw_bad_alloc();
      87                 : 
      88        60245449 :         return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
      89                 :       }
      90                 : 
      91                 :       // __p is not permitted to be a null pointer.
      92                 :       void
      93        46189719 :       deallocate(pointer __p, size_type)
      94        46189719 :       { ::operator delete(__p); }
      95                 : 
      96                 :       size_type
      97        60245449 :       max_size() const throw() 
      98        60245449 :       { return size_t(-1) / sizeof(_Tp); }
      99                 : 
     100                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     101                 :       // 402. wrong new expression in [some_] allocator::construct
     102                 :       void 
     103       610995737 :       construct(pointer __p, const _Tp& __val) 
     104       610995737 :       { ::new(__p) _Tp(__val); }
     105                 : 
     106                 :       void 
     107       559914299 :       destroy(pointer __p) { __p->~_Tp(); }
     108                 :     };
     109                 : 
     110                 :   template<typename _Tp>
     111                 :     inline bool
     112                 :     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     113                 :     { return true; }
     114                 :   
     115                 :   template<typename _Tp>
     116                 :     inline bool
     117                 :     operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     118                 :     { return false; }
     119                 : } // namespace __gnu_cxx
     120                 : 
     121                 : #endif