"<i>Is possible to implement traits on generic types?<\/i>可以在泛型类型上实现特征吗？<\/b> <i>(Rust)<\/i> （锈）<\/b>"

Question

I'm new to rust, and I want to implement the frequent math multiplication of a vector by a scalar: k * v<\/strong> =(k * v0,k * v1,k* v2..). The code is the following:

#[derive(Debug)]
struct V(Vec<i32>);

impl std::ops::Mul<V> for i32 {
    type Output = V;
    fn mul(self, v: V) -> V {
        V(v.0.iter().map(|v| v * self).collect())
    }
}

fn main() {
    let v = V(vec![1,2]);
    println!("{:?}", 3 * v);
}

Answer 1

In short, no.

struct Wrapper<T>(T);

trait Print {
  fn print(&self);
}

impl Print for Wrapper<i32> {
  fn print(&self) {
    println!("a very special int: {}", self);
  }
}

impl<T: Display> Print for Wrapper<T> {
  fn print(&self) {
    print!("a normal type: {}", self);
  }
}