src/doc/book/listings/ch13-functional-features/listing-13-08/src/main.rs

   1 #[derive(Debug)]
   2 struct Rectangle {
   3     width: u32,
   4     height: u32,
   5 }
   6
   7 fn main() {
   8     let mut list = [
   9         Rectangle {
  10             width: 10,
  11             height: 1,
  12         },
  13         Rectangle {
  14             width: 3,
  15             height: 5,
  16         },
  17         Rectangle {
  18             width: 7,
  19             height: 12,
  20         },
  21     ];
  22
  23     let mut sort_operations = vec![];
  24     let value = String::from("by key called");
  25
  26     list.sort_by_key(|r| {
  27         sort_operations.push(value);
  28         r.width
  29     });
  30     println!("{:#?}", list);
  31 }