c ++：新的Object（）和Object（）之间的区别是什么？ [英] c++: what's the difference between new Object() and Object()

问题描述

所以在C ++中你可以使用new关键字或其他实例化对象...

so in C++ you can instantiate objects using the new keyword or otherwise...

Object o = new Object();

但您也可以执行

Object o = Object();

两者之间的区别是什么，为什么要使用一个呢？

what exactly is the difference b/w the two and why would I use one over the other?

推荐答案

你不能做 Object o = new Object（）; new 运算符返回一个指向类型的指针。它必须是 Object * o = new Object（）; Object 堆。

You can't do Object o = new Object(); The new operator returns a pointer to the type. It would have to be Object* o = new Object(); The Object instance will be on the heap.

Object o = Object（）将创建对象 堆栈上的实例。我的C ++是生锈的，但我相信，虽然这天真地看起来像一个创作，然后一个作业，它实际上将作为一个构造函数调用。

Object o = Object() will create an Object instance on the stack. My C++ is rusty, but I believe even though this naively looks like an creation followed by an assignment, it will actually be done as just a constructor call.

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