🔗 Pre-Class Learning Material

1. CppCon 2019: Klaus Iglberger “Back to Basics: Move Semantics (part 1 of 2)”
   • covers r- and l-value references, move constructor and assignment operator
2. CppCon 2019: Klaus Iglberger “Back to Basics: Move Semantics (part 2 of 2)”
   • reccomended: first half hour (discusses forwarding references)
   • optional: second half hour, which has some tricky exercises
     • these might be fun to talk through in class (feel free to watch ahead of time!)

These talks were part of a “Back to Basics” series at CppCon 2019, many of which I have enjoyed. It’s worth searching CppCon 2019 Back to Basics up on YouTube and perusing them!

🔗 Conversation Starters/Discussion Questions

1. What (????) does this code snippet even do? (I checked, it compiles.)

   std::string s{"hi"};
   s + s = s;
   

2. What are the plusses and minuses of using

   ...
   , pi( std::move(w.pi) )
   { w.pi = nullptr }
   ...
   

   versus

   ... ,pi( std::exchange(w.pi, nullptr))
   

3. Why is it important to make move constructors and move assignment operators noexcept?
4. What is std::swap and how does it relate to moving?
5. What is the point of a function with a const return object (e.g., const Widget getWidget();)? When (if ever) would this be useful?
6. Do you have any obervations/comments or questions about the giant “Paramater Conventions” table at 53:43?