您是否能够将指针数组的值设置为等于指向类的指针的类 [英] Are you able to set the value of an array of pointers to classes equal to a pointer to a class

问题描述

假设有一个功能程序围绕此工作将进行以下工作：

Assuming that there is a functional program built around this will the following work:

Item** items;
Item* item;
int nItems;

items[nItems] = item;

或者我必须设置每个实例的每个成员变量更像是这样的项目：

Or would I have to set each member variable of each instance of Item more like this:

int newId = item->getId();


items[i]->setID(newId);

推荐答案

第一个如果变量被正确初始化，选项将有一些修改。

The first option will work with some modifications, provided that the variables are initialized properly.

int nItems = 5;
Item** items = (Item**)calloc(nItems, sizeof(Item*));
Item* item = new Item(); // If Item is a class

items[nItems] = item;  // nItems will be outside the length of the array
items[0] = item;



// Cleanup
if (items != null)
{
    for (int i=0; i<nitems;>    {
        if (items[i] != null)
            delete items[i];
    }
    free(items);
    items = null;
}

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