std::reverse_iterator是一种迭代器适配器,它反转给定迭代器的方向,该迭代器必须至少是老式双向迭代器(LegacyBidirectionalIterator)或实现bidirectional_iterator(C++20 起)。换言之,提供双向迭代器时,std::reverse_iterator产生一个新的迭代器,它从底层的双向迭代器所定义的序列的末尾移动到开端。
std::reverse_iterator是C++标准库中的一个迭代器适配器,用于反向遍历容器。它的缺点主要有以下几点: 1. 性能较低:由于std::reverse_iterator是通过逆向遍历...
迭代器(iterator) // 使用正向迭代器遍历字符串 for (std::string::iterator it = str.begin(); it != str.end(); ++it) { std::cout << *it << " "; } std::cout << std::endl; // 使用反向迭代器遍历字符串 for (std::string::reverse_iterator rit = str.rbegin(); rit != str....
std的find和reverse_iterator联合使用 上代码: //test2013.cpp : 定义控制台应用程序的入口点。//#include"stdafx.h"#include<stdlib.h>#include<stdio.h>#include<iostream>#include<vector>#include#include<string>usingnamespacestd;structCmpByKeyNumber {booloperator()(constint& k1,constint&k2) {returnk1...
string &append(const_iterator first,const_iterator last);//把迭代器first和last之间的部分连接到当前字符串的结尾 string的比较: bool operator==(const string &s1,const string &s2)const;//比较两个字符串是否相等 运算符">","<",">=","<=","!="均被重载用于字符串的比较; ...
#include <iostream> #include <string> #include <iterator> int main() { std::string s = "Hello, world"; std::reverse_iterator<std::string::iterator> r = s.rbegin(); r[7] = 'O'; // 以 'O' 替换 'o' r += 7; // 迭代器现在指向 'O' std::string rev(r, s.rend()); st...
typedefbasic_string<char>string; #ifdef _GLIBCXX_USE_WCHAR_T /// A string of @c wchar_t typedefbasic_string<wchar_t>wstring; #endif #if ((__cplusplus >= 201103L) \ && defined(_GLIBCXX_USE_C99_STDINT_TR1)) /// A string of @c char16_t ...
string &append(const_iterator first,const_iterator last);//把迭代器first和last之间的部分连接到当前字符串的结尾 string的比较: bool operator==(const string &s1,const string &s2)const;//比较两个字符串是否相等 运算符">","<",">=","<=","!="均被重载用于字符串的比较; ...
#include <iostream> #include <string> #include <iterator> int main() { std::string s = "Hello, world"; std::reverse_iterator<std::string::iterator> r = s.rbegin(); r[7] = 'O'; // replaces 'o' with 'O' r += 7; // iterator now points at 'O' std::string rev(r, s...
* last character in the %string. */const_iteratorend()const_GLIBCXX_NOEXCEPT{returnconst_iterator(_M_data()+this->size());}/** * Returns a read/write reverse iterator that points to the last * character in the %string. Iteration is done in reverse element ...