operator+(std::reverse_iterator)

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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)

 

<tbody> </tbody> <tbody class="t-dcl-rev "> </tbody>

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 << ' '; // 3
        std::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)