std::reverse_iterator<Iter>::operator++,+,+=,--,-,-=

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Iterator library

Iterator concepts
indirectly_readable (C++20) indirectly_writable (C++20) weakly_incrementable (C++20) incrementable (C++20) input_or_output_iterator (C++20) sentinel_for (C++20) sized_sentinel_for (C++20)	input_iterator (C++20) output_iterator (C++20) forward_iterator (C++20) bidirectional_iterator (C++20) random_access_iterator (C++20) contiguous_iterator (C++20)
Iterator primitives
iterator_traits input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag (C++20) iterator (deprecated in C++17)	incrementable_traits (C++20) indirectly_readable_traits (C++20) iter_value_titer_difference_titer_reference_titer_const_reference_titer_rvalue_reference_titer_common_reference_t (C++20)(C++20)(C++20)(C++23)(C++20)(C++20)
Algorithm concepts and utilities
Indirect callable concepts
indirectly_unary_invocableindirectly_regular_unary_invocable (C++20)(C++20)   indirect_unary_predicate (C++20)	indirect_binary_predicate (C++20) indirect_equivalence_relation (C++20) indirect_strict_weak_order (C++20)
Common algorithm requirements
indirectly_movable (C++20) indirectly_movable_storable (C++20) indirectly_copyable (C++20) indirectly_copyable_storable (C++20)	indirectly_swappable (C++20) indirectly_comparable (C++20) permutable (C++20) mergeable (C++20) sortable (C++20)
Utilities
indirect_result_t (C++20)	projected (C++20)
Iterator adaptors
reverse_iterator move_iterator (C++11) move_sentinel (C++20) common_iterator (C++20) counted_iterator (C++20) basic_const_iterator (C++23) const_iterator (C++23) const_sentinel (C++23) back_insert_iterator front_insert_iterator insert_iterator	make_reverse_iterator (C++14) make_move_iterator (C++11) default_sentinel_tdefault_sentinel (C++20)(C++20) unreachable_sentinel_tunreachable_sentinel (C++20)(C++20) make_const_iterator (C++23) make_const_sentinel (C++23) back_inserter front_inserter inserter
Stream iterators
istream_iterator ostream_iterator	istreambuf_iterator ostreambuf_iterator
Iterator customization points
ranges::iter_move (C++20)
ranges::iter_swap (C++20)
Iterator operations
advance distance prev (C++11) next (C++11)	ranges::advance (C++20) ranges::distance (C++20) ranges::prev (C++20) ranges::next (C++20)
Range access
begincbegin (C++11)(C++14) endcend (C++11)(C++14) sizessize (C++17)(C++20)	rbegincrbegin (C++14)(C++14) rendcrend (C++14)(C++14) empty (C++17) data (C++17)

 

std::reverse_iterator

Member functions

reverse_iterator::reverse_iterator

reverse_iterator::operator=

reverse_iterator::base

reverse_iterator::operator*reverse_iterator::operator->

reverse_iterator::operator[]

reverse_iterator::operator++reverse_iterator::operator+reverse_iterator::operator+=reverse_iterator::operator--reverse_iterator::operator-reverse_iterator::operator-=

Non-member functions

operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20)

operator+

operator-

iter_move (C++20)

iter_swap (C++20)

make_reverse_iterator (C++14)

 

	(1)
reverse_iterator& operator++();			(until C++17)
constexpr reverse_iterator& operator++();			(since C++17)
		(2)
reverse_iterator& operator--();				(until C++17)
constexpr reverse_iterator& operator--();				(since C++17)
			(3)
reverse_iterator operator++( int );					(until C++17)
constexpr reverse_iterator operator++( int );					(since C++17)
				(4)
reverse_iterator operator--( int );						(until C++17)
constexpr reverse_iterator operator--( int );						(since C++17)
					(5)
reverse_iterator operator+( difference_type n ) const;							(until C++17)
constexpr reverse_iterator operator+( difference_type n ) const;							(since C++17)
						(6)
reverse_iterator operator-( difference_type n ) const;								(until C++17)
constexpr reverse_iterator operator-( difference_type n ) const;								(since C++17)
							(7)
reverse_iterator& operator+=( difference_type n );									(until C++17)
constexpr reverse_iterator& operator+=( difference_type n );									(since C++17)
								(8)
reverse_iterator& operator-=( difference_type n );										(until C++17)
constexpr reverse_iterator& operator-=( difference_type n );										(since C++17)

Increments or decrements the iterator. Inverse operations are applied to the underlying operator because of the reverse order.

1-2) Pre-increments or pre-decrements by one respectively.

3-4) Post-increments or post-decrements by one respectively.

5-6) Returns an iterator which is advanced by n or -n positions respectively.

7-8) Advances the iterator by n or -n positions respectively.

Parameters

n

-

position relative to current location.

Return value

1-2) *this.

3-4) a copy of *this that was made before the change.

5-6) reverse_iterator(base()-n) or reverse_iterator(base()+n) respectively.

7-8) *this.

Example

Run this code

#include <iostream>
#include <iterator>
#include <list>
#include <vector>
 
int main()
{
    std::vector v {0, 1, 2, 3, 4};
    auto rv = std::reverse_iterator {v.rbegin()};
    std::cout << *(++rv) << ' '; // 3
    std::cout << *(--rv) << ' '; // 4
    std::cout << *(rv + 3) << ' '; // 1
    rv += 3;
    std::cout << rv[0] << ' '; // 1
    rv -= 3;
    std::cout << rv[0] << '\n'; // 4
 
    std::list l {5, 6, 7, 8};
    auto rl = std::reverse_iterator {l.rbegin()};
    std::cout << *(++rl) << ' '; // OK: 3
    std::cout << *(--rl) << ' '; // OK: 4
    // The following statements raise compilation error because the
    // underlying iterator does not model the random access iterator:
//  *(rl + 3) = 13;
//  rl += 3;
//  rl -= 3;
}

Output:

3 4 1 1 4
7 8

See also

operator+	advances the iterator (function template)
operator-	computes the distance between two iterator adaptors (function template)