begin和cbegin返回指向vector首元素的迭代器,end和cend返回指向vector末元素后一元素的迭代器。其函数声明如下: iteratorbegin();//C++11 前iteratorbegin() noexcept;//C++11 起,C++20 前constexpr iteratorbegin() noexcept;//C++20 起const_iteratorbe
std::vector<int> myvector = {10,20,30,40,50}; std::cout<<"myvector contains:";for(auto it = myvector.cbegin(); it != myvector.cend(); ++it) std::cout<<''<< *it; std::cout<<'\n';return0; } Output: myvector contains:1020304050 std::vector::size Return size std::vecto...
C++ Vector // ConsoleApplication2.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include "iostream" #include "string" #include "vector" #include<algorithm> using namespace std; int main() { std::vector<int> vec; vec.assign(7, 100); // 7个元素,每个都是100 for (auto ...
std::duque（double-venden queue, 双端队列）是C++容器库里中有下标顺序容器，它允许在首尾部两端快速的插入和删除元素。其与std::vector的存储方式不同，deque的元素不是连续存储的。2. deque的用法 2.1 deque的定义和声明 std::deque在头文件<deque\>中定义，其声明如下：template<classT,classAllocator = ...
begincbegin (C++11) returns an iterator to the beginning (public member function) endcend (C++11) returns an iterator to the end (public member function) rbegincrbegin (C++11) returns a reverse iterator to the beginning (public member function) ...
(public member function of std::vector<T,Allocator>) front access the first element (public member function of std::vector<T,Allocator>) back access the last element (public member function of std::vector<T,Allocator>) Iterators begincbegin (C++11) returns an iterator to the ...
begincbegin (C++11) returns an iterator to the beginning (public member function) endcend (C++11) returns an iterator to the end (public member function) rbegincrbegin (C++11) returns a reverse iterator to the beginning (public member function) ...
(public member function of std::vector<T,Allocator>) front access the first element (public member function of std::vector<T,Allocator>) back access the last element (public member function of std::vector<T,Allocator>) Iterators begincbegin (C++11) returns an iterator to the ...
// vector::front#include <iostream>#include <vector>intmain () { std::vector<int> myvector; myvector.push_back(78); myvector.push_back(16);// now front equals 78, and back 16myvector.front() -= myvector.back(); std::cout <<"myvector.front() is now "<< myvector.front() ...
cbegin,cend: 提供常量正向迭代器,用于从list的开始到末尾的遍历,不允许修改元素。 crbegin,crend: 提供常量反向迭代器,用于从list的末尾到开始的遍历,不允许修改元素。 list的数据结构 STL中list是使用环状双向链表实现的。它的结点结构定义如下: template <class T> ...