deleting array 'list'
时间: 2024-10-19 13:05:52 浏览: 3
删除数组`list`通常意味着释放它所占用的所有内存空间,因为在C++中,动态创建的数组是通过`new[]`运算符分配的,所以在不再需要时应该使用`delete[]`运算符来清理。然而,由于这里`list`被声明为全局变量,而不是通过`new`初始化,删除数组的操作并不适用于这种静态存储区的对象。
在C++中,全局变量会在程序结束时自动析构,所以不需要手动删除。如果你是在堆上动态分配的`std::vector<Student>`或者其他自定义容器,那么你应该在完成所有操作后使用`vector.clear()`来清空内容,然后用`vector.shrink_to_fit()`尝试缩小到最小大小,最后用`vector.pop_back()`直到变得空,但不释放内存。对于`list`这样的数组,因为它是固定大小的,一般不需要特别去删除,除非是为了演示动态内存管理的概念。
```cpp
// 如果list是一个动态分配的数组,示例:
if (list != nullptr) {
for (int i = 0; i < listCount; ++i) {
delete &list[i];
}
delete[] list;
list = nullptr;
listCount = 0; // 或者保持listCount不变,但这取决于后续的逻辑
}
```
不过,鉴于这段代码中`list`是一个全局变量,上述操作并不适用。如果你担心内存泄漏,可以确保`Add`函数在复制完元素后释放掉新建的`Student`对象,避免内存浪费。
相关问题
array based list
An array-based list is a data structure that stores a collection of elements in an array. It provides a way to access elements in the list by their index position, and allows for adding, removing, and modifying elements.
In an array-based list, the elements are stored in contiguous memory locations, which means that elements can be accessed quickly by their index position. The array size is fixed at the time of creation, and the list size cannot exceed this limit. When elements are added or removed, the array may need to be resized, which can be a costly operation.
The advantage of an array-based list is that it provides constant-time access to elements by their index position. However, it may not be efficient for inserting or deleting elements in the middle of the list, as all the elements after the insertion or deletion point need to be shifted to make room or close the gap.
Overall, an array-based list is a simple and efficient data structure for storing a collection of elements, but its performance depends on the specific use case and the operations performed on the list.
E:\bird\bird\bird\mainscene.cpp:84: warning: deleting array '((MainScene*)this)->MainScene::m_barriers' delete m_barriers; ^
这个警告通常是由于使用了错误的删除操作符导致的。
根据警告信息,你尝试使用 `delete` 删除了一个数组 `m_barriers`。然而,根据你的描述,`m_barriers` 应该是一个指针而不是指向数组的指针。
要想正确删除指向数组的指针,应该使用 `delete[]` 运算符而不是 `delete` 运算符。因此,你需要将 `delete m_barriers;` 改为 `delete[] m_barriers;`。
修正后的代码如下:
```cpp
// 删除数组指针时使用 delete[]
delete[] m_barriers;
```
这样就可以避免警告并正确地删除指向数组的指针。请确保只有在使用 `new[]` 运算符分配内存时才使用 `delete[]` 运算符来删除对应的数组。如果你使用的是普通的指针(而不是指向数组的指针),则应该使用 `delete` 运算符来进行删除。
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