Shared pointer with two template parameter

Question

Hi

Below is my shared pointer implementation:
https://www.sololearn.com/en/compiler-playground/cckRLm8Eai3f

I am confused about last line in main function. I thought it should give me compilation error as we needed to have copy constructor implemented taking two template parameters T and U. Why it is not throwing error? What is this enhancement?
https://sololearn.com/compiler-playground/cckRLm8Eai3f/?ref=app

Answer 1

maybe you were thinking of
sharedptr<base> bdptr(dptr);
? This is not defined.

Answer 2

Thanks. It's what I was missing.