intermediateGenerics
Trait Bounds
Constrain generic types with trait bounds.
Trait Bounds
Constrain generic types with trait bounds.
Difficulty
Intermediate
Code
rust
use std::fmt::Display;
fn print_pair<T: Display, U: Display>(first: T, second: U) {
println!("{}, {}", first, second);
}
fn sum<T>(items: &[T]) -> T
where
T: std::ops::Add<Output = T> + Copy + Default,
{
let mut total = T::default();
for &item in items {
total = total + item;
}
total
}
fn main() {
print_pair(42, "hello");
println!("sum: {}", sum(&[1, 2, 3, 4, 5]));
}Explanation
Trait bounds constrain generic types. Use where for complex bounds.
Key Concepts
- Read the code carefully and understand the data flow
- Try modifying the example to see how it changes behavior
- Run this code in the Rust Playground
Related Topics
Browse more examples in the generics category to build a complete understanding of this topic.