C++ Vector遍历的几种方式（）

#include <vector>#include <iostream>using namespace std;struct Point{double x;double y;Point(){x = 0;y = 0;}};int main(){vector<Point> m_testPoint;m_testPoint.clear();m_testPoint.shrink_to_fit();for (int i = 0; i<10; ++i){Point temp;temp.x = i*i;temp.y = i*i;m_testPoint.push_back(temp);}//第一种遍历方式，下标cout << "第一种遍历方式，下标访问" << endl;for (int i = 0; i<m_testPoint.size(); ++i){cout << m_testPoint[i].x << "" << m_testPoint[i].y << endl;}//第二种遍历方式，迭代器cout << "第二种遍历方式，迭代器访问" << endl;for (vector<Point>::iterator iter = m_testPoint.begin(); iter != m_testPoint.end(); iter++){cout << (*iter).x << "" << (*iter).y << endl;}//第三种遍历方式，auto关键字cout << "C++11,第三种遍历方式，auto关键字" << endl;for (auto iter = m_testPoint.begin(); iter != m_testPoint.end(); iter++){cout << (*iter).x << "" << (*iter).y << endl;}//第四种遍历方式，auto关键字的另一种方式cout << "C++11,第四种遍历方式，auto关键字" << endl;for (auto i : m_testPoint){cout << i.x << "" << i.y << endl;}return 0;}