C ++动态分配数组，这是错的吗？ [英] C++ dynamically allocating arrays , is this wrong?

问题描述

你好



我想接受用户输入并使其达到动态数组的大小，

我做了这个就像你一样可以在下面的代码中看到。



问题是：我只是想知道这是否正确的方法呢？

i已经测试过，甚至做过内存泄漏测试，但一切都很好。





谢谢： ）



我的尝试：



int userinput = 0;



cout<< 输入数组大小：<< std :: endl：

cin>> userinput;



//我有一个名为Runner的班级。



Runner * arr = new Runner [userinput ];





delete [] arr;

Hello

I want to take user input and make it the size of a dynamic array,
and i did this as you can see in code below.

the question is: I just wondring if this is right way to do it ?
i have tested and even did a memory leak test but everything was just fine.


Thank you :)

What I have tried:

int userinput = 0;

cout << "Enter array size: " << std::endl:
cin >> userinput;

//I have class named Runner.

Runner * arr = new Runner[userinput];


delete [] arr;

推荐答案

是的，对我来说很好看。

使用这种技术你唯一需要注意的事项 - 如果Runner对象有一个需要参数的构造函数，那么就无法做到这一点。那时你需要使用std :: vector或指针数组来代替Runner，然后分别初始化（并销毁）每个元素。

Yep, looks good to me.
The only thing you need to be aware of using this technique - if the Runner objects have a constructor that requires a parameter, this cannot be done. That's when you either need to use a std::vector or an array of pointers to type Runner instead, and then initialise (and destroy) each element separately.

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