为什么这段代码在C ++中有内存泄漏

Question

I was told that the following code would result in a memory leak but I'm not certain why

object f(void)
    {
    object * o = new object(...);
    return *o;
    }

Is it because the object *o is copied before it is returned and the original copy is never deleted because it isn't an automatic variable?

Answer 1

The object created by new is never delete d.

The returned value is a separate object that is copy-constructed from the object pointed to by o .

In general, a function T f(){ /*...*/ return y; } T f(){ /*...*/ return y; } creates its return value as if by T{y} , ie constructing a T with the argument y .