There is a new edition of the book and this is an old link.
Generics are abstract stand-ins for concrete types or other properties.
struct Point<T, U> { x: T, y: U, } fn main() { let both_integer = Point { x: 5, y: 10 }; let both_float = Point { x: 1.0, y: 4.0 }; let integer_and_float = Point { x: 5, y: 4.0 }; }Run
Here are the relevant sections in the new and old books: