删除指针是什么意思？ [英] What does deleting a pointer mean?

问题描述

删除指针是否与释放指针一样（分配内存）？

Is deleting a pointer same as freeing a pointer (that allocates the memory)?

推荐答案

删除指针它指向，或者）意味着

Deleting a pointer (or deleting what it points to, alternatively) means

delete p;
delete[] p; // for arrays

p = new type;

它也可以指使用其他方式的动态内存管理，如 free

It may also refer to using other ways of dynamic memory management, like free

free(p);

以前使用malloc或calloc分配

which was previously allocated using malloc or calloc

p = malloc(size);

后者通常被称为释放，而前者通常被称为删除。 delete 用于具有析构函数的类，因为除了释放内存之外， delete 还会调用析构函数。 free （和malloc，calloc等）用于基本类型，但是在C ++中，new和delete也可以用于它们，所以没有太多理由使用malloc在C ++中，除了兼容性原因。

The latter is more often referred to as "freeing", while the former is more often called "deleting". delete is used for classes with a destructor since delete will call the destructor in addition to freeing the memory. free (and malloc, calloc etc) is used for basic types, but in C++ new and delete can be used for them likewise, so there isn't much reason to use malloc in C++, except for compatibility reasons.

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