libstdc++: std::reverse_iterator< _Iterator > Class Template Reference (original) (raw)

#include <[stl_iterator.h](a17942%5Fsource.html)>

Public Types
using difference_type = iter_difference_t< _Iterator >
using iterator_category = __detail::__clamp_iter_cat< typename __traits_type::iterator_category, random_access_iterator_tag >
using iterator_concept = __conditional_t< random_access_iterator< _Iterator >, random_access_iterator_tag, bidirectional_iterator_tag >
typedef _Iterator iterator_type
typedef __traits_type::pointer pointer
using reference = iter_reference_t< _Iterator >
using value_type = iter_value_t< _Iterator >
Public Member Functions
constexpr reverse_iterator () noexcept(/*conditional */)
constexpr reverse_iterator (const reverse_iterator &__x) noexcept(/*conditional */)
template<typename _Iter > requires __convertible<_Iter>
constexpr reverse_iterator (const reverse_iterator< _Iter > &__x) noexcept(/*conditional */)
constexpr reverse_iterator (iterator_type __x) noexcept(/*conditional */)
constexpr iterator_type base () const noexcept(/*conditional */)
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
template<typename _Iter > requires __convertible<_Iter> && assignable_from<_Iterator&, const _Iter&>
constexpr reverse_iterator & operator= (const reverse_iterator< _Iter > &__x) noexcept(/*conditional */)
constexpr reference operator[] (difference_type __n) const
Protected Attributes
_Iterator current
Friends
constexpr iter_rvalue_reference_t< _Iterator > iter_move (const reverse_iterator &__i) noexcept(is_nothrow_copy_constructible_v< _Iterator > &&noexcept(ranges::iter_move(--std::declval< _Iterator & >())))
template<indirectly_swappable< _Iterator > _Iter2>
constexpr void iter_swap (const reverse_iterator &__x, const reverse_iterator< _Iter2 > &__y) noexcept(is_nothrow_copy_constructible_v< _Iterator > &&is_nothrow_copy_constructible_v< _Iter2 > &&noexcept(ranges::iter_swap(--std::declval< _Iterator & >(), --std::declval< _Iter2 & >())))

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:

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 129 of file bits/stl_iterator.h.

__traits_type

template<typename _Iterator >

difference_type

template<typename _Iterator >

iterator_category

template<typename _Iterator >

iterator_concept

template<typename _Iterator >

iterator_type

template<typename _Iterator >

pointer

template<typename _Iterator >

template<typename _Iterator >

value_type

template<typename _Iterator >

reverse_iterator() [1/4]

template<typename _Iterator >

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

Definition at line 179 of file bits/stl_iterator.h.

reverse_iterator() [2/4]

template<typename _Iterator >

constexpr std::reverse_iterator< _Iterator >::reverse_iterator ( iterator_type __x) inlineexplicitconstexprnoexcept

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

Definition at line 188 of file bits/stl_iterator.h.

reverse_iterator() [3/4]

template<typename _Iterator >

reverse_iterator() [4/4]

template<typename _Iterator >

template<typename _Iter >
requires __convertible<_Iter>

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

Definition at line 215 of file bits/stl_iterator.h.

base()

template<typename _Iterator >

operator*()

template<typename _Iterator >

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 257 of file bits/stl_iterator.h.

operator+()

template<typename _Iterator >

Returns

A reverse_iterator that refers to current - __n

The underlying iterator must be a Random Access Iterator.

Definition at line 340 of file bits/stl_iterator.h.

operator++() [1/2]

template<typename _Iterator >

operator++() [2/2]

template<typename _Iterator >

Returns

The original value of *this

Decrements the underlying iterator.

Definition at line 301 of file bits/stl_iterator.h.

operator+=()

template<typename _Iterator >

Returns

*this

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

Definition at line 350 of file bits/stl_iterator.h.

operator-()

template<typename _Iterator >

Returns

A reverse_iterator that refers to current - __n

The underlying iterator must be a Random Access Iterator.

Definition at line 363 of file bits/stl_iterator.h.

operator--() [1/2]

template<typename _Iterator >

operator--() [2/2]

template<typename _Iterator >

Returns

A reverse_iterator with the previous value of *this

Increments the underlying iterator.

Definition at line 326 of file bits/stl_iterator.h.

operator-=()

template<typename _Iterator >

Returns

*this

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

Definition at line 373 of file bits/stl_iterator.h.

operator->()

template<typename _Iterator >

Returns

A pointer to the value at --current

This requires that --current is dereferenceable.

Definition at line 270 of file bits/stl_iterator.h.

operator=()

template<typename _Iterator >

template<typename _Iter >
requires __convertible<_Iter> && assignable_from<_Iterator&, const _Iter&>

operator[]()

template<typename _Iterator >

constexpr reference std::reverse_iterator< _Iterator >::operator[] ( difference_type __n) const inlineconstexpr

Returns

The value at current - __n - 1

The underlying iterator must be a Random Access Iterator.

Definition at line 386 of file bits/stl_iterator.h.

reverse_iterator

template<typename _Iterator >

template<typename _Iter >

iter_move

template<typename _Iterator >

constexpr iter_rvalue_reference_t< _Iterator > iter_move ( const reverse_iterator< _Iterator > & __i) friend

iter_swap

template<typename _Iterator >

template<indirectly_swappable< _Iterator > _Iter2>

current

template<typename _Iterator >


The documentation for this class was generated from the following file: