Thread: Question about strange constructors in class

They are respectively the copy constructor and assignment operator.
14.14 — Introduction to the copy constructor – Learn C++
22.3 — Move constructors and move assignment – Learn C++
21.12 — Overloading the assignment operator – Learn C++

The = delete means you're forbidding the use of these methods.
11.4 — Deleting functions – Learn C++

It's basically to prevent you from (accidentally) creating another copy of your app, using things like

Code:

D3DApp a, b;
a = b;  // nope!
D3DApp c(a);  // nope!