Module show_notes::e002

Something borrowed, something... moved?

• Date: October 12, 2015
• Subject: The struct data type constructor, and the basics of Rust's "ownership" concept and "borrowing" and "moving".
• Audio

Notes

Today's episode discusses, and the associated source code demonstrates, a few basic behaviors of structs... including borrowing!

After taking a short look at one of Rust's basic approaches to creating new types, we dive into a fairly thorough overview of how borrowing works in fairly run-of-the-mill Rust code. This is a basic introduction, and as such I'm not getting into things like heap-allocated memory (Box) or dealing with move semantics with threads or closures. (I haven't actually figured those out well enough yet to write something like this for them!)

As usual, you'll want to have the src open to see what I'm doing with the components documented below.

Links

• rustfmt -- a tool for formatting Rust code
  • repo
  • "rustfmt-ing Rust`
  • Reddit discussion
• RFC for incremental compilation
  • Text of the RFC
  • GitHub pull request

Follow/Support

• New Rustacean:
  • Twitter: @newrustacean
    • App.net: @newrustacean
    • Patreon
  • Email: [email protected]
• Chris Krycho
  • Twitter: @chriskrycho
    • App.net: @chriskrycho

Structs

Circle

This struct is simple but useful to see how borrowing and moving work.

Functions

borrow	Demonstrates general borrowing of an immutable reference.
borrow_mut	Demonstrates general borrowing of a mutable reference.
demonstrate_method_ownership	Demonstrates how the same concepts apply when dealing with methods.
demonstrate_ownership	Demonstrates how borrowing works with plain old functions.
move_circle	Demonstrates general moving of an instance.