Modules

We have seen how impl blocks let us namespace functions to a type.

Similarly, mod lets us namespace types and functions:

  1. mod foo {
  2.     pub fn do_something() {
  3.         println!("In the foo module");
  4.     }
  5. }
  7. mod bar {
  8.     pub fn do_something() {
  9.         println!("In the bar module");
  10.     }
  11. }
  13. fn main() {
  14.     foo::do_something();
  15.     bar::do_something();
  16. }

This slide should take about 3 minutes.

  • Packages provide functionality and include a Cargo.toml file that describes how to build a bundle of 1+ crates.
  • Crates are a tree of modules, where a binary crate creates an executable and a library crate compiles to a library.
  • Modules define organization, scope, and are the focus of this section.