当我们有new/delete时，为什么要使用malloc/free? [英] Why use malloc/free, when we have new/delete?

问题描述

当我们在C ++中具有new和delete时，malloc和free的用途是什么.我想free和delete的功能都相同.

What is the use of malloc and free when we have new and delete in C++. I guess function of both free and delete is same.

推荐答案

它们不一样. new调用构造函数，malloc只是分配内存.

They're not the same. new calls the constructor, malloc just allocates the memory.

此外，未定义的行为将两者混在一起(即，将new与free一起使用，并且将malloc与delete一起使用).

Also, it's undefined behavior mixing the two (i.e. using new with free and malloc with delete).

在C ++中，出于与C的兼容性原因，应该使用new和delete，malloc和free.

In C++, you're supposed to use new and delete, malloc and free are there for compatibility reasons with C.

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