LCOV - code coverage report
Current view: top level - usr/include/c++/4.9/ext - alloc_traits.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 4 8 50.0 %
Date: 2016-12-01 18:45:36 Functions: 3 12 25.0 %

          Line data    Source code
       1             : // Allocator traits -*- C++ -*-
       2             : 
       3             : // Copyright (C) 2011-2014 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             : /** @file ext/alloc_traits.h
      26             :  *  This file is a GNU extension to the Standard C++ Library.
      27             :  */
      28             : 
      29             : #ifndef _EXT_ALLOC_TRAITS_H
      30             : #define _EXT_ALLOC_TRAITS_H 1
      31             : 
      32             : #pragma GCC system_header
      33             : 
      34             : #if __cplusplus >= 201103L
      35             : # include <bits/move.h>
      36             : # include <bits/alloc_traits.h>
      37             : #else
      38             : # include <bits/allocator.h>  // for __alloc_swap
      39             : #endif
      40             : 
      41             : namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
      42             : {
      43             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      44             : 
      45             : #if __cplusplus >= 201103L
      46             :   template<typename _Alloc>
      47             :     struct __allocator_always_compares_equal : std::false_type { };
      48             : 
      49             :   template<typename _Tp>
      50             :     struct __allocator_always_compares_equal<std::allocator<_Tp>>
      51             :     : std::true_type { };
      52             : 
      53             :   template<typename, typename> struct array_allocator;
      54             : 
      55             :   template<typename _Tp, typename _Array>
      56             :     struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>>
      57             :     : std::true_type { };
      58             : 
      59             :   template<typename> struct bitmap_allocator;
      60             : 
      61             :   template<typename _Tp>
      62             :     struct __allocator_always_compares_equal<bitmap_allocator<_Tp>>
      63             :     : std::true_type { };
      64             : 
      65             :   template<typename> struct malloc_allocator;
      66             : 
      67             :   template<typename _Tp>
      68             :     struct __allocator_always_compares_equal<malloc_allocator<_Tp>>
      69             :     : std::true_type { };
      70             : 
      71             :   template<typename> struct mt_allocator;
      72             : 
      73             :   template<typename _Tp>
      74             :     struct __allocator_always_compares_equal<mt_allocator<_Tp>>
      75             :     : std::true_type { };
      76             : 
      77             :   template<typename> struct new_allocator;
      78             : 
      79             :   template<typename _Tp>
      80             :     struct __allocator_always_compares_equal<new_allocator<_Tp>>
      81             :     : std::true_type { };
      82             : 
      83             :   template<typename> struct pool_allocator;
      84             : 
      85             :   template<typename _Tp>
      86             :     struct __allocator_always_compares_equal<pool_allocator<_Tp>>
      87             :     : std::true_type { };
      88             : #endif
      89             : 
      90             : /**
      91             :  * @brief  Uniform interface to C++98 and C++0x allocators.
      92             :  * @ingroup allocators
      93             : */
      94             : template<typename _Alloc>
      95             :   struct __alloc_traits
      96             : #if __cplusplus >= 201103L
      97             :   : std::allocator_traits<_Alloc>
      98             : #endif
      99             :   {
     100             :     typedef _Alloc allocator_type;
     101             : #if __cplusplus >= 201103L
     102             :     typedef std::allocator_traits<_Alloc>           _Base_type;
     103             :     typedef typename _Base_type::value_type         value_type;
     104             :     typedef typename _Base_type::pointer            pointer;
     105             :     typedef typename _Base_type::const_pointer      const_pointer;
     106             :     typedef typename _Base_type::size_type          size_type;
     107             :     typedef typename _Base_type::difference_type    difference_type;
     108             :     // C++11 allocators do not define reference or const_reference
     109             :     typedef value_type&                             reference;
     110             :     typedef const value_type&                       const_reference;
     111             :     using _Base_type::allocate;
     112             :     using _Base_type::deallocate;
     113             :     using _Base_type::construct;
     114             :     using _Base_type::destroy;
     115             :     using _Base_type::max_size;
     116             : 
     117             :   private:
     118             :     template<typename _Ptr>
     119             :       using __is_custom_pointer
     120             :         = std::__and_<std::is_same<pointer, _Ptr>,
     121             :                       std::__not_<std::is_pointer<_Ptr>>>;
     122             : 
     123             :   public:
     124             :     // overload construct for non-standard pointer types
     125             :     template<typename _Ptr, typename... _Args>
     126             :       static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
     127             :       construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
     128             :       {
     129             :         _Base_type::construct(__a, std::addressof(*__p),
     130             :                               std::forward<_Args>(__args)...);
     131             :       }
     132             : 
     133             :     // overload destroy for non-standard pointer types
     134             :     template<typename _Ptr>
     135             :       static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
     136             :       destroy(_Alloc& __a, _Ptr __p)
     137             :       { _Base_type::destroy(__a, std::addressof(*__p)); }
     138             : 
     139          48 :     static _Alloc _S_select_on_copy(const _Alloc& __a)
     140          48 :     { return _Base_type::select_on_container_copy_construction(__a); }
     141             : 
     142           0 :     static void _S_on_swap(_Alloc& __a, _Alloc& __b)
     143           0 :     { std::__alloc_on_swap(__a, __b); }
     144             : 
     145          12 :     static constexpr bool _S_propagate_on_copy_assign()
     146          12 :     { return _Base_type::propagate_on_container_copy_assignment::value; }
     147             : 
     148             :     static constexpr bool _S_propagate_on_move_assign()
     149             :     { return _Base_type::propagate_on_container_move_assignment::value; }
     150             : 
     151             :     static constexpr bool _S_propagate_on_swap()
     152             :     { return _Base_type::propagate_on_container_swap::value; }
     153             : 
     154           0 :     static constexpr bool _S_always_equal()
     155           0 :     { return __allocator_always_compares_equal<_Alloc>::value; }
     156             : 
     157             :     static constexpr bool _S_nothrow_move()
     158             :     { return _S_propagate_on_move_assign() || _S_always_equal(); }
     159             : 
     160             :     static constexpr bool _S_nothrow_swap()
     161             :     {
     162             :       using std::swap;
     163             :       return !_S_propagate_on_swap()
     164             :         || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>()));
     165             :     }
     166             : 
     167             :     template<typename _Tp>
     168             :       struct rebind
     169             :       { typedef typename _Base_type::template rebind_alloc<_Tp> other; };
     170             : #else
     171             : 
     172             :     typedef typename _Alloc::pointer                pointer;
     173             :     typedef typename _Alloc::const_pointer          const_pointer;
     174             :     typedef typename _Alloc::value_type             value_type;
     175             :     typedef typename _Alloc::reference              reference;
     176             :     typedef typename _Alloc::const_reference        const_reference;
     177             :     typedef typename _Alloc::size_type              size_type;
     178             :     typedef typename _Alloc::difference_type        difference_type;
     179             : 
     180             :     static pointer
     181             :     allocate(_Alloc& __a, size_type __n)
     182             :     { return __a.allocate(__n); }
     183             : 
     184             :     static void deallocate(_Alloc& __a, pointer __p, size_type __n)
     185             :     { __a.deallocate(__p, __n); }
     186             : 
     187             :     template<typename _Tp>
     188             :       static void construct(_Alloc& __a, pointer __p, const _Tp& __arg)
     189             :       { __a.construct(__p, __arg); }
     190             : 
     191             :     static void destroy(_Alloc& __a, pointer __p)
     192             :     { __a.destroy(__p); }
     193             : 
     194             :     static size_type max_size(const _Alloc& __a)
     195             :     { return __a.max_size(); }
     196             : 
     197             :     static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; }
     198             : 
     199             :     static void _S_on_swap(_Alloc& __a, _Alloc& __b)
     200             :     {
     201             :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     202             :       // 431. Swapping containers with unequal allocators.
     203             :       std::__alloc_swap<_Alloc>::_S_do_it(__a, __b);
     204             :     }
     205             : 
     206             :     template<typename _Tp>
     207             :       struct rebind
     208             :       { typedef typename _Alloc::template rebind<_Tp>::other other; };
     209             : #endif
     210             :   };
     211             : 
     212             : _GLIBCXX_END_NAMESPACE_VERSION
     213             : } // namespace std
     214             : 
     215             : #endif

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