operator+(std::reverse_iterator)

 

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)

诊断库

内存管理库

元编程库(C++11)

通用工具库

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迭代器库

范围库(C++20)

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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 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)

 

在标头 <iterator> 定义
template<class Iter > reverse_iterator<Iter> operator+     (typename reverse_iterator<Iter>::difference_type n,       const reverse_iterator<Iter>& it );		(C++17 起为 constexpr) (C++23 前)
template<class Iter > constexpr reverse_iterator<Iter> operator+     (std::iter_difference_t<Iter> n, const reverse_iterator<Iter>& it );		(C++23 起)

返回增加了 n 的迭代器 it。底层迭代器实际上减少了 n。

参数

n	-	迭代器所要增加的位置数
it	-	要增加的迭代器适配器

返回值

reverse_iterator<Iter>(it.base()- n)

示例

运行此代码

#include <iostream>#include <iterator>#include <list>#include <vector>   int main(){{std::vector v{0, 1, 2, 3};std::reverse_iterator<std::vector<int>::iterator> ri1{std::reverse_iterator{v.rbegin()}};std::cout<<*ri1 <<' ';// 3std::reverse_iterator<std::vector<int>::iterator> ri2{2+ ri1};std::cout<<*ri2 <<' ';// 1}   {std::list l{5, 6, 7, 8};std::reverse_iterator<std::list<int>::iterator> ri1{std::reverse_iterator{l.rbegin()}};std::cout<<*ri1 <<'\n';// 8// auto ri2{2 + ri1}; // 错误：底层迭代器未实现随机访问迭代器}}

输出：

3 1 8

参阅

operator++operator++(int)operator+=operator+operator--operator--(int)operator-=operator-	推进或回退 reverse_iterator (公开成员函数)
operator-	计算两个迭代器适配器间的距离 (函数模板)