src/doc/book/redirects/associated-types.md

   1 % Associated Types
   2
   3 <small>There is a new edition of the book and this is an old link.</small>
   4
   5 > Associated types are a way of associating a type placeholder with a trait such that the trait method definitions can use these placeholder types in their signatures.
   6
   7 ```rust
   8 pub trait Iterator {
   9     type Item;
  10     fn next(&mut self) -> Option<Self::Item>;
  11 }
  12 ```
  13
  14 ---
  15
  16 Here are the relevant sections in the new and old books:
  17
  18 * **[In the second edition: Ch 19.03 — Advanced Traits][2]**
  19 * <small>[In the first edition: Ch 3.30 — Associated Types][1]</small>
  20
  21
  22 [1]: first-edition/associated-types.html
  23 [2]: second-edition/ch19-03-advanced-traits.html#associated-types-specify-placeholder-types-in-trait-definitions