How to obtain a shared pointer to a member

Asked Apr 07 '17 at 16:01

Active Apr 07 '17 at 16:04

Viewed 41 times

Suppose I have a shared pointer to some data structure:

struct Data {
    int a;
    int b;
};
shared_ptr<Data> data = make_shared<Data>();

Is it possible to obtain a shared_ptr<int> to data->b which reuses the ref-count of data.

I.e. I want to pass a shared pointer to only a part of a reference-counted structure.

asked Apr 07 '17 at 16:01

Tali

Yes it is possible. – Jarod42 Apr 07 '17 at 16:14
Thanks for the pointer, I really missed the aliasing constructor. – Tali Apr 07 '17 at 16:59
So the answer is: `shared_ptr b = shared_ptr(data, &data->b);`. – Tali Apr 08 '17 at 10:27

0 Answers0