STL中Vector的使用方法详解-优快云博客

本文详细介绍C++标准库中的Vector容器的使用方法，包括初始化、遍历、增删元素等操作，以及size、capacity等成员函数的应用。

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转载自：http://blog.sina.com.cn/s/blog_5cf5e7c40100boiu.html

//VectorDemo.cpp : 定义控制台应用程序的入口点。
//Visual C++ 6.0 中编译通过

# include <iostream>
# include <vector>

using namespace std;

typedef vector<int> INTVECTOR;

void PrintIntVector(INTVECTOR iVector)
{
//遍历vector方法 cout<<"Vector: ["; for(INTVECTOR::iterator it = iVector.begin(); it != iVector.end(); it++) { cout<<*it; if(it != iVector.end()-1) { cout<<","; } } cout<<"]"<<endl; } int main(int argc, char* argv[]) { INTVECTOR iVector; //push_back方法 iVector.push_back(2); iVector.push_back(3); iVector.push_back(4); iVector.push_back(1); iVector.push_back(10); iVector.push_back(20); PrintIntVector(iVector); //Vector: [2,3,4,1,10,20] //pop_back方法 iVector.pop_back(); PrintIntVector(iVector); //Vector: [2,3,4,1,10] //size、capacity 与 max_size方法 cout<<"size="<<iVector.size()<<" capacity="<<iVector.capacity()<<"max_size="<<iVector.max_size()<<endl; //size=5 capacity=6max_size=1073741823 //reserve方法 iVector.reserve(20); cout<<"After reserve: size="<<iVector.size()<<" capacity="<<iVector.capacity()<<"max_size="<<iVector.max_size()<<endl; //After reserve: size=5 capacity=20max_size=1073741823 //resize方法 iVector.resize(100); cout<<"After resize: size="<<iVector.size()<<" capacity="<<iVector.capacity()<<"max_size="<<iVector.max_size()<<endl; //After resize: size=100 capacity=100max_size=1073741823 //begin方法 iVector.resize(5);//修改为5 INTVECTOR::iterator iter; iter = iVector.begin(); cout<<"First element:"<<*iter<<endl; //First element:2 //insert方法 //PrintIntVector(iVector); iter = iVector.insert(iter, 65); iVector.insert(iter+1, 2, 30); iVector.insert(iVector.end(), iVector.begin(), iVector.end());//复制 PrintIntVector(iVector); //Vector: [65,30,30,2,3,4,1,10,65,30,30,2,3,4,1,10] //at方法 cout<<"Fifth element:"<<iVector.at(4)<<endl; //Fifth element:3 //front 和 back方法 cout<<"First element: "<<iVector.front()<< endl; cout<<"Last element: "<<iVector.back()<< endl; //First element: 65 //Last element: 10 //erase方法 iVector.erase(iVector.begin()); PrintIntVector(iVector); //Vector: [30,30,2,3,4,1,10,65,30,30,2,3,4,1,10] //reverse_iterator使用方法