NAME

       std::reverse_iterator< _Iterator >

SYNOPSIS

       Inherits std::iterator< iterator_traits< _Iterator >::iterator_category, iterator_traits<
       _Iterator >::value_type, iterator_traits< _Iterator >::difference_type, iterator_traits<
       _Iterator >::pointer, iterator_traits< _Iterator >::reference >.

   Public Types
       typedef __traits_type::difference_type difference_type
       typedef iterator_traits< _Iterator >::iterator_category iterator_category
           One of the tag types.
       typedef _Iterator iterator_type
       typedef __traits_type::pointer pointer
       typedef __traits_type::reference reference
       typedef iterator_traits< _Iterator >::value_type value_type
           The type 'pointed to' by the iterator.

   Public Member Functions
       constexpr reverse_iterator ()
       constexpr reverse_iterator (const reverse_iterator &__x)
       template<typename _Iter > constexpr reverse_iterator (const reverse_iterator< _Iter >
           &__x)
       constexpr reverse_iterator (iterator_type __x)
       constexpr iterator_type base () const
       constexpr reference operator* () const
       constexpr reverse_iterator operator+ (difference_type __n) const
       constexpr reverse_iterator & operator++ ()
       constexpr reverse_iterator operator++ (int)
       constexpr reverse_iterator & operator+= (difference_type __n)
       constexpr reverse_iterator operator- (difference_type __n) const
       constexpr reverse_iterator & operator-- ()
       constexpr reverse_iterator operator-- (int)
       constexpr reverse_iterator & operator-= (difference_type __n)
       constexpr pointer operator-> () const
       reverse_iterator & operator= (const reverse_iterator &)=default
       constexpr reference operator[] (difference_type __n) const

   Protected Types
       typedef iterator_traits< _Iterator > __traits_type

   Protected Attributes
       _Iterator current

Detailed Description

   template<typename _Iterator>
       class std::reverse_iterator< _Iterator >" Bidirectional and random access iterators have
       corresponding reverse iterator adaptors that iterate through the data structure in the
       opposite direction. They have the same signatures as the corresponding iterators. The
       fundamental relation between a reverse iterator and its corresponding iterator i is
       established by the identity:

       &*(reverse_iterator(i)) == &*(i - 1)

       This mapping is dictated by the fact that while there is always a pointer past the end of
       an array, there might not be a valid pointer before the beginning of an array.
       [24.4.1]/1,2

       Reverse iterators can be tricky and surprising at first. Their semantics make sense,
       however, and the trickiness is a side effect of the requirement that the iterators must be
       safe.

       Definition at line 126 of file bits/stl_iterator.h.

Member Typedef Documentation

   typedef iterator_traits< _Iterator >::iterator_category  std::iterator< iterator_traits<
       _Iterator >::iterator_category , iterator_traits< _Iterator >::value_type ,
       iterator_traits< _Iterator >::difference_type , iterator_traits< _Iterator >::pointer ,
       iterator_traits< _Iterator >::reference  >::iterator_category [inherited]
       One of the tag types.

       Definition at line 130 of file stl_iterator_base_types.h.

   typedef iterator_traits< _Iterator >::value_type  std::iterator< iterator_traits< _Iterator
       >::iterator_category , iterator_traits< _Iterator >::value_type , iterator_traits<
       _Iterator >::difference_type , iterator_traits< _Iterator >::pointer , iterator_traits<
       _Iterator >::reference  >::value_type [inherited]
       The type 'pointed to' by the iterator.

       Definition at line 132 of file stl_iterator_base_types.h.

Constructor & Destructor Documentation

   template<typename _Iterator > constexpr std::reverse_iterator< _Iterator >::reverse_iterator
       () [inline],  [constexpr]
       The default constructor value-initializes member current. If it is a pointer, that means
       it is zero-initialized.

       Definition at line 165 of file bits/stl_iterator.h.

       Referenced by std::reverse_iterator< _Iterator >::operator+(), and std::reverse_iterator<
       _Iterator >::operator-().

   template<typename _Iterator > constexpr std::reverse_iterator< _Iterator >::reverse_iterator
       (iterator_type __x) [inline],  [explicit],  [constexpr]
       This iterator will move in the opposite direction that x does.

       Definition at line 171 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr std::reverse_iterator< _Iterator >::reverse_iterator
       (const reverse_iterator< _Iterator > & __x) [inline],  [constexpr]
       The copy constructor is normal.

       Definition at line 177 of file bits/stl_iterator.h.

   template<typename _Iterator > template<typename _Iter > constexpr std::reverse_iterator<
       _Iterator >::reverse_iterator (const reverse_iterator< _Iter > & __x) [inline],
       [constexpr]
       A reverse_iterator across other types can be copied if the underlying iterator can be
       converted to the type of current.

       Definition at line 190 of file bits/stl_iterator.h.

Member Function Documentation

   template<typename _Iterator > constexpr iterator_type std::reverse_iterator< _Iterator >::base
       () const [inline],  [constexpr]
       Returns
           current, the iterator used for underlying work.

       Definition at line 197 of file bits/stl_iterator.h.

       Referenced by std::operator==().

   template<typename _Iterator > constexpr reference std::reverse_iterator< _Iterator
       >::operator* () const [inline],  [constexpr]
       Returns
           A reference to the value at --current

       This requires that --current is dereferenceable.

       Warning
           This implementation requires that for an iterator of the underlying iterator type, x,
           a reference obtained by *x remains valid after x has been modified or destroyed. This
           is a bug: http://gcc.gnu.org/PR51823

       Definition at line 211 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reverse_iterator std::reverse_iterator< _Iterator
       >::operator+ (difference_type __n) const [inline],  [constexpr]
       Returns
           A reverse_iterator that refers to current - __n

       The underlying iterator must be a Random Access Iterator.

       Definition at line 292 of file bits/stl_iterator.h.

       References std::reverse_iterator< _Iterator >::reverse_iterator().

   template<typename _Iterator > constexpr reverse_iterator& std::reverse_iterator< _Iterator
       >::operator++ () [inline],  [constexpr]
       Returns
           *this

       Decrements the underlying iterator.

       Definition at line 242 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reverse_iterator std::reverse_iterator< _Iterator
       >::operator++ (int) [inline],  [constexpr]
       Returns
           The original value of *this

       Decrements the underlying iterator.

       Definition at line 254 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reverse_iterator& std::reverse_iterator< _Iterator
       >::operator+= (difference_type __n) [inline],  [constexpr]
       Returns
           *this

       Moves the underlying iterator backwards __n steps. The underlying iterator must be a
       Random Access Iterator.

       Definition at line 302 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reverse_iterator std::reverse_iterator< _Iterator
       >::operator- (difference_type __n) const [inline],  [constexpr]
       Returns
           A reverse_iterator that refers to current - __n

       The underlying iterator must be a Random Access Iterator.

       Definition at line 314 of file bits/stl_iterator.h.

       References std::reverse_iterator< _Iterator >::reverse_iterator().

   template<typename _Iterator > constexpr reverse_iterator& std::reverse_iterator< _Iterator
       >::operator-- () [inline],  [constexpr]
       Returns
           *this

       Increments the underlying iterator.

       Definition at line 267 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reverse_iterator std::reverse_iterator< _Iterator
       >::operator-- (int) [inline],  [constexpr]
       Returns
           A reverse_iterator with the previous value of *this

       Increments the underlying iterator.

       Definition at line 279 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reverse_iterator& std::reverse_iterator< _Iterator
       >::operator-= (difference_type __n) [inline],  [constexpr]
       Returns
           *this

       Moves the underlying iterator forwards __n steps. The underlying iterator must be a Random
       Access Iterator.

       Definition at line 324 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr pointer std::reverse_iterator< _Iterator >::operator->
       () const [inline],  [constexpr]
       Returns
           A pointer to the value at --current

       This requires that --current is dereferenceable.

       Definition at line 223 of file bits/stl_iterator.h.

   template<typename _Iterator > constexpr reference std::reverse_iterator< _Iterator
       >::operator[] (difference_type __n) const [inline],  [constexpr]
       Returns
           The value at current - __n - 1

       The underlying iterator must be a Random Access Iterator.

       Definition at line 336 of file bits/stl_iterator.h.

Author

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