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  1. use std::ops::{Deref, DerefMut, Index, IndexMut};
  2.  
  3. #[derive(Debug)]
  4. struct MyVec<T>(Vec<T>);
  5.  
  6. impl<T> Deref for MyVec<T> {
  7.     type Target = Vec<T>;
  8.     fn deref(&self) -> &Vec<T> {
  9.         &self.0
  10.     }
  11. }
  12.  
  13. impl<T> DerefMut for MyVec<T> {
  14.     fn deref_mut(&mut self) -> &mut Vec<T> {
  15.         &mut self.0
  16.     }
  17. }
  18.  
  19. impl<T> Index<i32> for MyVec<T> {
  20.     type Output = T;
  21.     fn index(&self, index: i32) -> &T {
  22.         &self.0[index as usize]
  23.     }
  24. }
  25.  
  26. impl<T> IndexMut<i32> for MyVec<T> {
  27.     fn index_mut(&mut self, index: i32) -> &mut T {
  28.         &mut self.0[index as usize]
  29.     }
  30. }
  31.  
  32. fn main() {
  33.     let mut v = MyVec(Vec::<i32>::new());
  34.  
  35.     v.push(10);
  36.     v.push(20);
  37.     println!("{:?}", v);
  38.     for i in v.iter() {
  39.         println!("{}", i);
  40.     }
  41.  
  42.     v.pop();
  43.     println!("{:?}", v);
  44.     for i in v.iter() {
  45.         println!("{}", i);
  46.     }
  47.  
  48.     v.push(30);
  49.     let mut i :i32 = 0;
  50.     v[i] = -78;
  51.     println!("{:?}", v);
  52.     while i < v.len() as i32 {
  53.         println!("{}", v[i]);
  54.         i += 1;
  55.     }
  56. }
Success #stdin #stdout 0s 4444KB
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MyVec([10, 20])
10
20
MyVec([10])
10
MyVec([-78, 30])
-78
30
https://ideone.com/4HZTOr
language:
Rust (rust 1.56)
created:
6 years ago
visibility:
public

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