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LCOV - code coverage report
Current view: top level - usr/include/c++/4.4.7/bits - allocator.h (source / functions) Hit Total Coverage
Test: PHP Code Coverage Lines: 2 2 100.0 %
Date: 2014-08-04 Functions: 4 4 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : // Allocators -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 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             : /*
      27             :  * Copyright (c) 1996-1997
      28             :  * Silicon Graphics Computer Systems, Inc.
      29             :  *
      30             :  * Permission to use, copy, modify, distribute and sell this software
      31             :  * and its documentation for any purpose is hereby granted without fee,
      32             :  * provided that the above copyright notice appear in all copies and
      33             :  * that both that copyright notice and this permission notice appear
      34             :  * in supporting documentation.  Silicon Graphics makes no
      35             :  * representations about the suitability of this software for any
      36             :  * purpose.  It is provided "as is" without express or implied warranty.
      37             :  */
      38             : 
      39             : /** @file allocator.h
      40             :  *  This is an internal header file, included by other library headers.
      41             :  *  You should not attempt to use it directly.
      42             :  */
      43             : 
      44             : #ifndef _ALLOCATOR_H
      45             : #define _ALLOCATOR_H 1
      46             : 
      47             : // Define the base class to std::allocator.
      48             : #include <bits/c++allocator.h>
      49             : 
      50             : _GLIBCXX_BEGIN_NAMESPACE(std)
      51             : 
      52             :   /**
      53             :    * @defgroup allocators Allocators
      54             :    * @ingroup memory
      55             :    *
      56             :    * Classes encapsulating memory operations.
      57             :    */
      58             : 
      59             :   template<typename _Tp>
      60             :     class allocator;
      61             : 
      62             :   /// allocator<void> specialization.
      63             :   template<>
      64             :     class allocator<void>
      65             :     {
      66             :     public:
      67             :       typedef size_t      size_type;
      68             :       typedef ptrdiff_t   difference_type;
      69             :       typedef void*       pointer;
      70             :       typedef const void* const_pointer;
      71             :       typedef void        value_type;
      72             : 
      73             :       template<typename _Tp1>
      74             :         struct rebind
      75             :         { typedef allocator<_Tp1> other; };
      76             :     };
      77             : 
      78             :   /**
      79             :    * @brief  The "standard" allocator, as per [20.4].
      80             :    * @ingroup allocators
      81             :    *
      82             :    *  Further details:
      83             :    *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html
      84             :    */
      85             :   template<typename _Tp>
      86             :     class allocator: public __glibcxx_base_allocator<_Tp>
      87             :     {
      88             :    public:
      89             :       typedef size_t     size_type;
      90             :       typedef ptrdiff_t  difference_type;
      91             :       typedef _Tp*       pointer;
      92             :       typedef const _Tp* const_pointer;
      93             :       typedef _Tp&       reference;
      94             :       typedef const _Tp& const_reference;
      95             :       typedef _Tp        value_type;
      96             : 
      97             :       template<typename _Tp1>
      98             :         struct rebind
      99             :         { typedef allocator<_Tp1> other; };
     100             : 
     101          74 :       allocator() throw() { }
     102             : 
     103             :       allocator(const allocator& __a) throw()
     104             :       : __glibcxx_base_allocator<_Tp>(__a) { }
     105             : 
     106             :       template<typename _Tp1>
     107             :         allocator(const allocator<_Tp1>&) throw() { }
     108             : 
     109          74 :       ~allocator() throw() { }
     110             : 
     111             :       // Inherit everything else.
     112             :     };
     113             : 
     114             :   template<typename _T1, typename _T2>
     115             :     inline bool
     116             :     operator==(const allocator<_T1>&, const allocator<_T2>&)
     117             :     { return true; }
     118             : 
     119             :   template<typename _Tp>
     120             :     inline bool
     121             :     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     122             :     { return true; }
     123             : 
     124             :   template<typename _T1, typename _T2>
     125             :     inline bool
     126             :     operator!=(const allocator<_T1>&, const allocator<_T2>&)
     127             :     { return false; }
     128             : 
     129             :   template<typename _Tp>
     130             :     inline bool
     131             :     operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
     132             :     { return false; }
     133             : 
     134             :   // Inhibit implicit instantiations for required instantiations,
     135             :   // which are defined via explicit instantiations elsewhere.
     136             :   // NB: This syntax is a GNU extension.
     137             : #if _GLIBCXX_EXTERN_TEMPLATE
     138             :   extern template class allocator<char>;
     139             :   extern template class allocator<wchar_t>;
     140             : #endif
     141             : 
     142             :   // Undefine.
     143             : #undef __glibcxx_base_allocator
     144             : 
     145             :   // To implement Option 3 of DR 431.
     146             :   template<typename _Alloc, bool = __is_empty(_Alloc)>
     147             :     struct __alloc_swap
     148             :     { static void _S_do_it(_Alloc&, _Alloc&) { } };
     149             : 
     150             :   template<typename _Alloc>
     151             :     struct __alloc_swap<_Alloc, false>
     152             :     {
     153             :       static void
     154             :       _S_do_it(_Alloc& __one, _Alloc& __two)
     155             :       {
     156             :         // Precondition: swappable allocators.
     157             :         if (__one != __two)
     158             :           swap(__one, __two);
     159             :       }
     160             :     };
     161             : 
     162             :   // Optimize for stateless allocators.
     163             :   template<typename _Alloc, bool = __is_empty(_Alloc)>
     164             :     struct __alloc_neq
     165             :     {
     166             :       static bool
     167             :       _S_do_it(const _Alloc&, const _Alloc&)
     168             :       { return false; }
     169             :     };
     170             : 
     171             :   template<typename _Alloc>
     172             :     struct __alloc_neq<_Alloc, false>
     173             :     {
     174             :       static bool
     175             :       _S_do_it(const _Alloc& __one, const _Alloc& __two)
     176             :       { return __one != __two; }
     177             :     };
     178             : 
     179             : _GLIBCXX_END_NAMESPACE
     180             : 
     181             : #endif

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