libstdc++-v3/include/debug/stl_iterator.h

   1 // Debugging support implementation -*- C++ -*-
   2
   3 // Copyright (C) 2015-2020 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 debug/stl_iterator.h
  26  *  This file is a GNU debug extension to the Standard C++ Library.
  27  */
  28
  29 #ifndef _GLIBCXX_DEBUG_STL_ITERATOR_H
  30 #define _GLIBCXX_DEBUG_STL_ITERATOR_H 1
  31
  32 #include <debug/helper_functions.h>
  33
  34 namespace __gnu_debug
  35 {
  36   // Help Debug mode to see through reverse_iterator.
  37   template<typename _Iterator>
  38     inline bool
  39     __valid_range(const std::reverse_iterator<_Iterator>& __first,
  40                   const std::reverse_iterator<_Iterator>& __last,
  41                   typename _Distance_traits<_Iterator>::__type& __dist)
  42     { return __valid_range(__last.base(), __first.base(), __dist); }
  43
  44   template<typename _Iterator>
  45     inline typename _Distance_traits<_Iterator>::__type
  46     __get_distance(const std::reverse_iterator<_Iterator>& __first,
  47                    const std::reverse_iterator<_Iterator>& __last)
  48     { return __get_distance(__last.base(), __first.base()); }
  49
  50   template<typename _Iterator, typename _Size>
  51     inline bool
  52     __can_advance(const std::reverse_iterator<_Iterator>& __it, _Size __n)
  53     { return __can_advance(__it.base(), -__n); }
  54
  55   template<typename _Iterator, typename _Sequence>
  56     inline std::reverse_iterator<_Iterator>
  57     __base(const std::reverse_iterator<_Safe_iterator<
  58              _Iterator, _Sequence, std::random_access_iterator_tag> >& __it)
  59     { return std::reverse_iterator<_Iterator>(__it.base().base()); }
  60
  61 #if __cplusplus < 201103L
  62   template<typename _Iterator>
  63     struct _Unsafe_type<std::reverse_iterator<_Iterator> >
  64     {
  65       typedef typename _Unsafe_type<_Iterator>::_Type _UnsafeType;
  66       typedef std::reverse_iterator<_UnsafeType> _Type;
  67     };
  68
  69   template<typename _Iterator>
  70     inline std::reverse_iterator<typename _Unsafe_type<_Iterator>::_Type>
  71     __unsafe(const std::reverse_iterator<_Iterator>& __it)
  72     {
  73       typedef typename _Unsafe_type<_Iterator>::_Type _UnsafeType;
  74       return std::reverse_iterator<_UnsafeType>(__unsafe(__it.base()));
  75     }
  76 #else
  77   template<typename _Iterator>
  78     inline auto
  79     __unsafe(const std::reverse_iterator<_Iterator>& __it)
  80     -> decltype(std::__make_reverse_iterator(__unsafe(__it.base())))
  81     { return std::__make_reverse_iterator(__unsafe(__it.base())); }
  82 #endif
  83
  84 #if __cplusplus >= 201103L
  85   // Help Debug mode to see through move_iterator.
  86   template<typename _Iterator>
  87     inline bool
  88     __valid_range(const std::move_iterator<_Iterator>& __first,
  89                   const std::move_iterator<_Iterator>& __last,
  90                   typename _Distance_traits<_Iterator>::__type& __dist)
  91     { return __valid_range(__first.base(), __last.base(), __dist); }
  92
  93   template<typename _Iterator>
  94     inline typename _Distance_traits<_Iterator>::__type
  95     __get_distance(const std::move_iterator<_Iterator>& __first,
  96                    const std::move_iterator<_Iterator>& __last)
  97     { return __get_distance(__first.base(), __last.base()); }
  98
  99   template<typename _Iterator, typename _Size>
 100     inline bool
 101     __can_advance(const std::move_iterator<_Iterator>& __it, _Size __n)
 102     { return __can_advance(__it.base(), __n); }
 103
 104   template<typename _Iterator>
 105     inline auto
 106     __unsafe(const std::move_iterator<_Iterator>& __it)
 107     -> decltype(std::make_move_iterator(__unsafe(__it.base())))
 108     { return std::make_move_iterator(__unsafe(__it.base())); }
 109
 110   template<typename _Iterator>
 111     inline auto
 112     __base(const std::move_iterator<_Iterator>& __it)
 113     -> decltype(std::make_move_iterator(__base(__it.base())))
 114     { return std::make_move_iterator(__base(__it.base())); }
 115 #endif
 116 }
 117
 118 #endif