结构体中使用泛型

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//结构体中使用不同的泛型
#[derive(Debug)]
struct Point<T,U> {
    x: T,
    y: U,
  }
fn main() {
    let a = Point{x:1.1,y:'a'};
    println!("{:?}",a);

  }

枚举中使用泛型

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enum Option<T> {
     Some(T),
     None,
  }
enum Result<T,E> {
    Ok(T),
    Err(E),
  }

方法中使用泛型

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# [derive(Debug)]
struct Point<T> {
    x:T,
    y:T,
  }
impl <T> Point<T> {
    fn get_x(&self) -> &T {
        &self.x
      }
    fn get_y(&self) -> &T {
        &self.y
      }
  }
struct Point2<T,U> {
    x:T,
    y:U,
  }
impl <T,U> Point2<T,U> {
      fn create_point<V,W> (self, other:Point2<V,W>) -> Point2<T,W> {
         //这里使用self是因为没有实现cpoy trait,如果实现了copy trait就可以
         Point2 {
            x: self.x,
            y: other.y,
          } 
        }
  }

fn main() {
    let p = Point{x:1.1,y:2.2};
    println!("x = {},y = {}",p.get_x(),p.get_y()); 
   
   let p = Point{x:1.1,y:2.2};
    println!("x = {},y = {}",p.get_x(),p.get_y());
   
   let p1 = Point2{x:5,y:1.1};
   let p2 = Point2{x:"hello",y:'c'};
   let p3 = p1.create_point(p2);
   println!("p3 = {:?}",p3);
  }