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

 

C++

编译器支持

自立实现与有宿主实现

语言

标准库

标准库标头

具名要求

功能特性测试宏 (C++20)

语言支持库

概念库 (C++20)

元编程库 (C++11)

诊断库

通用工具库

字符串库

容器库

迭代器库

范围库 (C++20)

算法库

数值库

本地化库

输入/输出库

文件系统库 (C++17)

正则表达式库 (C++11)

并发支持库 (C++11)

技术规范

符号索引

外部库

 

迭代器库

迭代器概念
indirectly_readable (C++20) indirectly_writable (C++20) weakly_incrementable (C++20) incrementable (C++20) is-integer-like is-signed-integer-like (C++20)(C++20)	sentinel_for (C++20) sized_sentinel_for (C++20) input_iterator (C++20) output_iterator (C++20) input_or_output_iterator (C++20)	forward_iterator (C++20) bidirectional_iterator (C++20) random_access_iterator (C++20) contiguous_iterator (C++20)
迭代器原语
input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag (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)	iterator (C++17 中弃用) iterator_traits incrementable_traits (C++20) indirectly_readable_traits (C++20)
算法概念与工具
间接可调用概念
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)
常用算法要求
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)
工具
indirect_result_t (C++20)	projected (C++20)	projected_value_t (C++26)
迭代器适配器
reverse_iterator make_reverse_iterator (C++14) move_iterator (C++11) make_move_iterator (C++11) default_sentinel_tdefault_sentinel (C++20)(C++20) unreachable_sentinel_tunreachable_sentinel (C++20)(C++20)	front_insert_iterator back_insert_iterator inserter insert_iterator front_inserter back_inserter 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) make_const_iterator (C++23) make_const_sentinel (C++23)
流迭代器 istream_iterator    ostream_iterator istreambuf_iterator ostreambuf_iterator	迭代器定制点 ranges::iter_move (C++20) ranges::iter_swap (C++20)
迭代器操作 advance distance prev (C++11)   next (C++11) ranges::advance (C++20) ranges::distance (C++20) ranges::prev (C++20) ranges::next (C++20)	范围访问 begincbegin (C++11)(C++14) rbegincrbegin (C++14)(C++14)   endcend (C++11)(C++14) rendcrend (C++14)(C++14)   sizessize (C++17)(C++20) empty (C++17) data (C++17)

 

std::reverse_iterator

成员函数

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-=

非成员函数

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

自增或自减迭代器。应用逆运算到底层迭代器，因为逆序。

1,2) 分别前自增或前自减一。

3,4) 分别后自增或后自减一。

5,6) 分别返回前进 n 或 -n 个位置的迭代器。

7,8) 分别令迭代器前进 n 或 -n 个位置。

参数

n

-

相对于当前位置的位置

返回值

1,2) *this

3,4) *this 修改前的副本。

5,6) 分别为 reverse_iterator(base()-n) 或 reverse_iterator(base()+n)。

7,8) *this

示例

运行此代码

#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) << '\n'; // OK: 4
    // 由于底层迭代器并未实现随机访问迭代器，下列语句会引发编译错误：
//  *(rl + 3) = 13;
//  rl += 3;
//  rl -= 3;
}

输出：

3 4 1 1 4
7 8

参阅

operator+	令迭代器前进 (函数模板)
operator-	计算两个迭代器适配器间的距离 (函数模板)