Deep-const Propagation Using propagate_const - Video

How is "const Data*" different from "Data * const"?
If you have an instance variable "Data* m_data" in a class, can you then change the data pointed to in a const method? (The answer is a bit unexpected, yes).

In this episode, Jesper interviews Peppe on a helper class called propogate_const, which also makes the pointed-to object const in const methods.

Links mentioned in this video:
* Blog post on "QObjects, Ownership, propagate_const and C++ Evolution": https://www.kdab.com/qobject_ownership_propagate_const/
* Episode on "Working with Git Sub-Modules": https://www.youtube.com/watch?v=Np8FOQ4nM4U

00:00 intro
00:40 What is const useful for?
02:50 Why do we use pointers in Qt?
12:10 Constness and pointers
20:00 Const methods 101
22:15 What happens with pointer data members in const methods?
26:08 Introducing propagate_const
33:30 How to deal with autogenerated code
37:20 Can we automatically refactor existing code?

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