std::reverse_iterator man page

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

_GLIBCXX17_CONSTEXPR reverse_iterator ()
_GLIBCXX17_CONSTEXPR reverse_iterator (iterator_type __x)
_GLIBCXX17_CONSTEXPR reverse_iterator (const reverse_iterator &__x)
template<typename _Iter > _GLIBCXX17_CONSTEXPR reverse_iterator (const reverse_iterator< _Iter > &__x)
_GLIBCXX17_CONSTEXPR iterator_type base () const
_GLIBCXX17_CONSTEXPR reference operator* () const
_GLIBCXX17_CONSTEXPR reverse_iterator operator+ (difference_type __n) const
_GLIBCXX17_CONSTEXPR reverse_iterator & operator++ ()
_GLIBCXX17_CONSTEXPR reverse_iterator operator++ (int)
_GLIBCXX17_CONSTEXPR reverse_iterator & operator+= (difference_type __n)
_GLIBCXX17_CONSTEXPR reverse_iterator operator- (difference_type __n) const
_GLIBCXX17_CONSTEXPR reverse_iterator & operator-- ()
_GLIBCXX17_CONSTEXPR reverse_iterator operator-- (int)
_GLIBCXX17_CONSTEXPR reverse_iterator & operator-= (difference_type __n)
_GLIBCXX17_CONSTEXPR pointer operator-> () const
_GLIBCXX17_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 101 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 121 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 123 of file stl_iterator_base_types.h.

Constructor & Destructor Documentation

template<typename _Iterator> _GLIBCXX17_CONSTEXPR std::reverse_iterator< _Iterator >::reverse_iterator () [inline]

The default constructor value-initializes member current. If it is a pointer, that means it is zero-initialized.

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

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

template<typename _Iterator> _GLIBCXX17_CONSTEXPR std::reverse_iterator< _Iterator >::reverse_iterator (iterator_type __x) [inline], [explicit]

This iterator will move in the opposite direction that x does.

Definition at line 132 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR std::reverse_iterator< _Iterator >::reverse_iterator (const reverse_iterator< _Iterator > & __x) [inline]

The copy constructor is normal.

Definition at line 138 of file bits/stl_iterator.h.

template<typename _Iterator> template<typename _Iter > _GLIBCXX17_CONSTEXPR std::reverse_iterator< _Iterator >::reverse_iterator (const reverse_iterator< _Iter > & __x) [inline]

A reverse_iterator across other types can be copied if the underlying iterator can be converted to the type of current.

Definition at line 147 of file bits/stl_iterator.h.

Member Function Documentation

template<typename _Iterator> _GLIBCXX17_CONSTEXPR iterator_type std::reverse_iterator< _Iterator >::base () const [inline]

Returns:

current, the iterator used for underlying work.

Definition at line 154 of file bits/stl_iterator.h.

Referenced by std::make_reverse_iterator(), and std::operator==().

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reference std::reverse_iterator< _Iterator >::operator* () const [inline]

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 168 of file bits/stl_iterator.h.

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

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator std::reverse_iterator< _Iterator >::operator+ (difference_type __n) const [inline]

Returns:

A reverse_iterator that refers to current - __n

The underlying iterator must be a Random Access Iterator.

Definition at line 239 of file bits/stl_iterator.h.

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

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator& std::reverse_iterator< _Iterator >::operator++ () [inline]

Returns:

*this

Decrements the underlying iterator.

Definition at line 189 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator std::reverse_iterator< _Iterator >::operator++ (int) [inline]

Returns:

The original value of *this

Decrements the underlying iterator.

Definition at line 201 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator& std::reverse_iterator< _Iterator >::operator+= (difference_type __n) [inline]

Returns:

*this

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

Definition at line 249 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator std::reverse_iterator< _Iterator >::operator- (difference_type __n) const [inline]

Returns:

A reverse_iterator that refers to current - __n

The underlying iterator must be a Random Access Iterator.

Definition at line 261 of file bits/stl_iterator.h.

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

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator& std::reverse_iterator< _Iterator >::operator-- () [inline]

Returns:

*this

Increments the underlying iterator.

Definition at line 214 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator std::reverse_iterator< _Iterator >::operator-- (int) [inline]

Returns:

A reverse_iterator with the previous value of *this

Increments the underlying iterator.

Definition at line 226 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reverse_iterator& std::reverse_iterator< _Iterator >::operator-= (difference_type __n) [inline]

Returns:

*this

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

Definition at line 271 of file bits/stl_iterator.h.

template<typename _Iterator> _GLIBCXX17_CONSTEXPR pointer std::reverse_iterator< _Iterator >::operator-> () const [inline]

Returns:

A pointer to the value at --current

This requires that --current is dereferenceable.

Definition at line 180 of file bits/stl_iterator.h.

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

template<typename _Iterator> _GLIBCXX17_CONSTEXPR reference std::reverse_iterator< _Iterator >::operator[] (difference_type __n) const [inline]

Returns:

The value at current - __n - 1

The underlying iterator must be a Random Access Iterator.

Definition at line 283 of file bits/stl_iterator.h.

Author

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Wed Aug 2 2017 libstdc++