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std::basic_string<CharT,Traits,Allocator>::rbegin, std::basic_string<CharT,Traits,Allocator>::crbegin

来自cppreference.com
< cpp‎ | string‎ | basic string
 
 
 
std::basic_string
 
(1)
reverse_iterator rbegin();
(C++11 前)
reverse_iterator rbegin() noexcept;
(C++11 起)
(C++20 前)
constexpr reverse_iterator rbegin() noexcept;
(C++20 起)
(2)
const_reverse_iterator rbegin() const;
(C++11 前)
const_reverse_iterator rbegin() const noexcept;
(C++11 起)
(C++20 前)
constexpr const_reverse_iterator rbegin() const noexcept;
(C++20 起)
(3)
const_reverse_iterator crbegin() const noexcept;
(C++11 起)
(C++20 前)
constexpr const_reverse_iterator crbegin() const noexcept;
(C++20 起)

返回指向逆转字符串首字符的逆向迭代器。它对应非逆向字符串的末字符。

range-rbegin-rend.svg

参数

(无)

返回值

指向首字符的逆向迭代器

复杂度

常数

示例

#include <iostream>
#include <algorithm>
#include <iterator>
#include <string>
 
int main()
{
    std::string s("Exemplar!");
    *s.rbegin() = 'y';
    std::cout << s << '\n'; // "Exemplary"
 
    std::string c;
    std::copy(s.crbegin(), s.crend(), std::back_inserter(c));
    std::cout << c << '\n'; // "yralpmexE"
}

输出:

Exemplary
yralpmexE

参阅

返回指向末尾的逆向迭代器
(公开成员函数)
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