Will reference to member variable get corrupted after object deletion?

Question

Can I use ref after object deletion like shown in this example or is it unsafe?

struct Object
{
    int value;
};

void function()
{
    Object* object = new Object();
    int& ref = object->value;
    delete object;
    ref = 50;
}

Answer 1

It is unsafe.

Any use of a pointer or reference to a member of a destroyed object is undefined behavior.

Answer 2

No, you cannot. Object::value is a subobject of Object. Destroying *object also destroys object->value. After delete object;, the reference no longer refers to a valid object and any usage of the value of ref is undefined behavior.