Question

我想访问类实例的公共变量，其中实例保存在类类型的向量中。我必须使用迭代器来遍历vector的所有元素，但这使我困惑如何在存在迭代器的情况下获取变量。我正在使用C ++ 98。

source.cpp：

#include <iostream>
#include <vector>
#include "Rectangle.h" 

using namespace std;

int main() {    
    int len = 2, hen = 5;   
    int len2 = 4, hen2 = 10;

    Rectangle rect1(len, hen);  
    Rectangle rect2(len2, hen2);        
    vector<Rectangle> Rects;
    Rects.push_back(rect1);
    Rects.push_back(rect2);

    for (std::vector<Rectangle>::iterator it = Rects.begin(); it != Rects.end(); ++it) {        
       //how to access length and height here?  
    }

    system("pause");    
    return 0; 
}

Rectangle.h：

#pragma once
class Rectangle
{
private:        

public:
    int length;
    int height;

    Rectangle(int& length, int& height);
    ~Rectangle();
};

Rectangle.cpp：

#include "Rectangle.h"

Rectangle::Rectangle(int& length, int& height) 
    : length(length), height(height)
{ }

Rectangle::~Rectangle() {}

Answer 1

首先将矩形添加到矢量，然后取消迭代迭代器并访问元素。

int main() {    
    int len = 2, hen = 5;   
    int len2 = 4, hen2 = 10;

    Rectangle rect1(len, hen);  
    Rectangle rect2(len2, hen2);        
    vector<Rectangle> Rects;
    Rects.push_back(rect1);
    Rects.push_back(rect2);

    for (std::vector<Rectangle>::iterator it = Rects.begin(); it != Rects.end(); ++it) {        
       std::cout << "length " <<(*it).length<<std::endl;
       std::cout << "height " <<(*it).height<<std::endl;
    }

    system("pause");    
    return 0; 
}

如何在向量迭代器内访问类变量？

1 个答案: