std::reverse_iterator< _Iterator >

Section: C Library Functions (3)
Updated: Wed Apr 17 2019
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NAME

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 127 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 133 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 139 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 148 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 155 of file bits/stl_iterator.h.

Referenced by 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 169 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 242 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 192 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 204 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 252 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 264 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 217 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 229 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 274 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 183 of file bits/stl_iterator.h.

References std::__addressof().

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 286 of file bits/stl_iterator.h.

Author

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