Last time #
C++ is C with:
- Generics
- Classses
- A big stdlib
- Some smaller changes.
This time #
RAII #
Need to specifically talk about the RAII is pattern.
- Destructors let us free resources other than memory.
- Show file wrapper (we can even do this for open (2)).
- Show mutex wrapper.
Then, more stdlib #
- std::string_view - Look, it’s slices
And the key stuff #
Two more stdlib features:
- std::unique_ptr / make_unique
- std::shared_ptr / make_shared
These are huge, and can save us from needing to manually call “delete” or “free” almost ever.
Sequence:
- Port our conslist to use std::unique_ptr
- Make shared structure lists.
- Port our conslist to use std::shared_ptr
- Complain about circular lists.
- Demonstrate solving it with std::weak_ptr
When might we still need to manually call new / delete?
When might we still need to call malloc / free in a C++ program?
Overflow #
- Let’s figure out lambdas and do a lambda example.
