LCOV - code coverage report
Current view: top level - usr/include/c++/4.9/bits - allocator.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 5 9 55.6 %
Date: 2016-09-12 13:07:23 Functions: 29 84 34.5 %

          Line data    Source code
       1             : // Allocators -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2001-2014 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 3, 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             : // Under Section 7 of GPL version 3, you are granted additional
      17             : // permissions described in the GCC Runtime Library Exception, version
      18             : // 3.1, as published by the Free Software Foundation.
      19             : 
      20             : // You should have received a copy of the GNU General Public License and
      21             : // a copy of the GCC Runtime Library Exception along with this program;
      22             : // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23             : // <http://www.gnu.org/licenses/>.
      24             : 
      25             : /*
      26             :  * Copyright (c) 1996-1997
      27             :  * Silicon Graphics Computer Systems, Inc.
      28             :  *
      29             :  * Permission to use, copy, modify, distribute and sell this software
      30             :  * and its documentation for any purpose is hereby granted without fee,
      31             :  * provided that the above copyright notice appear in all copies and
      32             :  * that both that copyright notice and this permission notice appear
      33             :  * in supporting documentation.  Silicon Graphics makes no
      34             :  * representations about the suitability of this software for any
      35             :  * purpose.  It is provided "as is" without express or implied warranty.
      36             :  */
      37             : 
      38             : /** @file bits/allocator.h
      39             :  *  This is an internal header file, included by other library headers.
      40             :  *  Do not attempt to use it directly. @headername{memory}
      41             :  */
      42             : 
      43             : #ifndef _ALLOCATOR_H
      44             : #define _ALLOCATOR_H 1
      45             : 
      46             : #include <bits/c++allocator.h> // Define the base class to std::allocator.
      47             : #include <bits/memoryfwd.h>
      48             : #if __cplusplus >= 201103L
      49             : #include <type_traits>
      50             : #endif
      51             : 
      52             : namespace std _GLIBCXX_VISIBILITY(default)
      53             : {
      54             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      55             : 
      56             :   /**
      57             :    *  @addtogroup allocators
      58             :    *  @{
      59             :    */
      60             : 
      61             :   /// allocator<void> specialization.
      62             :   template<>
      63             :     class allocator<void>
      64             :     {
      65             :     public:
      66             :       typedef size_t      size_type;
      67             :       typedef ptrdiff_t   difference_type;
      68             :       typedef void*       pointer;
      69             :       typedef const void* const_pointer;
      70             :       typedef void        value_type;
      71             : 
      72             :       template<typename _Tp1>
      73             :         struct rebind
      74             :         { typedef allocator<_Tp1> other; };
      75             : 
      76             : #if __cplusplus >= 201103L
      77             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
      78             :       // 2103. std::allocator propagate_on_container_move_assignment
      79             :       typedef true_type propagate_on_container_move_assignment;
      80             : #endif
      81             :     };
      82             : 
      83             :   /**
      84             :    * @brief  The @a standard allocator, as per [20.4].
      85             :    *
      86             :    *  See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html
      87             :    *  for further details.
      88             :    *
      89             :    *  @tparam  _Tp  Type of allocated object.
      90             :    */
      91             :   template<typename _Tp>
      92             :     class allocator: public __allocator_base<_Tp>
      93             :     {
      94             :    public:
      95             :       typedef size_t     size_type;
      96             :       typedef ptrdiff_t  difference_type;
      97             :       typedef _Tp*       pointer;
      98             :       typedef const _Tp* const_pointer;
      99             :       typedef _Tp&       reference;
     100             :       typedef const _Tp& const_reference;
     101             :       typedef _Tp        value_type;
     102             : 
     103             :       template<typename _Tp1>
     104             :         struct rebind
     105             :         { typedef allocator<_Tp1> other; };
     106             : 
     107             : #if __cplusplus >= 201103L
     108             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     109             :       // 2103. std::allocator propagate_on_container_move_assignment
     110             :       typedef true_type propagate_on_container_move_assignment;
     111             : #endif
     112             : 
     113         116 :       allocator() throw() { }
     114             : 
     115         117 :       allocator(const allocator& __a) throw()
     116         117 :       : __allocator_base<_Tp>(__a) { }
     117             : 
     118             :       template<typename _Tp1>
     119          50 :         allocator(const allocator<_Tp1>&) throw() { }
     120             : 
     121         283 :       ~allocator() throw() { }
     122             : 
     123             :       // Inherit everything else.
     124             :     };
     125             : 
     126             :   template<typename _T1, typename _T2>
     127             :     inline bool
     128             :     operator==(const allocator<_T1>&, const allocator<_T2>&)
     129             :     { return true; }
     130             : 
     131             :   template<typename _Tp>
     132             :     inline bool
     133           0 :     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     134           0 :     { return true; }
     135             : 
     136             :   template<typename _T1, typename _T2>
     137             :     inline bool
     138             :     operator!=(const allocator<_T1>&, const allocator<_T2>&)
     139             :     { return false; }
     140             : 
     141             :   template<typename _Tp>
     142             :     inline bool
     143           0 :     operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
     144           0 :     { return false; }
     145             : 
     146             :   /// @} group allocator
     147             : 
     148             :   // Inhibit implicit instantiations for required instantiations,
     149             :   // which are defined via explicit instantiations elsewhere.
     150             : #if _GLIBCXX_EXTERN_TEMPLATE
     151             :   extern template class allocator<char>;
     152             :   extern template class allocator<wchar_t>;
     153             : #endif
     154             : 
     155             :   // Undefine.
     156             : #undef __allocator_base
     157             : 
     158             :   // To implement Option 3 of DR 431.
     159             :   template<typename _Alloc, bool = __is_empty(_Alloc)>
     160             :     struct __alloc_swap
     161             :     { static void _S_do_it(_Alloc&, _Alloc&) _GLIBCXX_NOEXCEPT { } };
     162             : 
     163             :   template<typename _Alloc>
     164             :     struct __alloc_swap<_Alloc, false>
     165             :     {
     166             :       static void
     167             :       _S_do_it(_Alloc& __one, _Alloc& __two) _GLIBCXX_NOEXCEPT
     168             :       {
     169             :         // Precondition: swappable allocators.
     170             :         if (__one != __two)
     171             :           swap(__one, __two);
     172             :       }
     173             :     };
     174             : 
     175             :   // Optimize for stateless allocators.
     176             :   template<typename _Alloc, bool = __is_empty(_Alloc)>
     177             :     struct __alloc_neq
     178             :     {
     179             :       static bool
     180             :       _S_do_it(const _Alloc&, const _Alloc&)
     181             :       { return false; }
     182             :     };
     183             : 
     184             :   template<typename _Alloc>
     185             :     struct __alloc_neq<_Alloc, false>
     186             :     {
     187             :       static bool
     188             :       _S_do_it(const _Alloc& __one, const _Alloc& __two)
     189             :       { return __one != __two; }
     190             :     };
     191             : 
     192             : #if __cplusplus >= 201103L
     193             :   template<typename _Tp, bool
     194             :     = __or_<is_copy_constructible<typename _Tp::value_type>,
     195             :             is_nothrow_move_constructible<typename _Tp::value_type>>::value>
     196             :     struct __shrink_to_fit_aux
     197             :     { static bool _S_do_it(_Tp&) noexcept { return false; } };
     198             : 
     199             :   template<typename _Tp>
     200             :     struct __shrink_to_fit_aux<_Tp, true>
     201             :     {
     202             :       static bool
     203             :       _S_do_it(_Tp& __c) noexcept
     204             :       {
     205             :         __try
     206             :           {
     207             :             _Tp(__make_move_if_noexcept_iterator(__c.begin()),
     208             :                 __make_move_if_noexcept_iterator(__c.end()),
     209             :                 __c.get_allocator()).swap(__c);
     210             :             return true;
     211             :           }
     212             :         __catch(...)
     213             :           { return false; }
     214             :       }
     215             :     };
     216             : #endif
     217             : 
     218             : _GLIBCXX_END_NAMESPACE_VERSION
     219             : } // namespace std
     220             : 
     221             : #endif

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