X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/4f61be32dd480f23a7fef05ee66c42ae27c980c6..ab7f9b241429bd675b437d2437799de75d2f409b:/workspace/src/part07.rs?ds=inline

diff --git a/workspace/src/part07.rs b/workspace/src/part07.rs
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--- a/workspace/src/part07.rs
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-// ***Remember to enable/add this part in `main.rs`!***
-
-// Rust-101, Part 07: Operator Overloading, Tests, Formatting
-// ==========================================================
-
-pub use part05::BigInt;
-
-// With our new knowledge of lifetimes, we are now able to write down the desired type of `min`:
-pub trait Minimum {
-    fn min<'a>(&'a self, other: &'a Self) -> &'a Self;
-}
-
-pub fn vec_min<T: Minimum>(v: &Vec<T>) -> Option<&T> {
-    let mut min: Option<&T> = None;
-    for e in v {
-        unimplemented!()
-    }
-    min
-}
-
-// **Exercise 07.1**: For our `vec_min` to be usable with `BigInt`, you will have to provide an implementation of
-// `Minimum`. You should be able to pretty much copy the code you wrote for exercise 06.1. You should *not*
-// make any copies!
-impl Minimum for BigInt {
-    fn min<'a>(&'a self, other: &'a Self) -> &'a Self {
-        unimplemented!()
-    }
-}
-
-// ## Operator Overloading
-
-impl PartialEq for BigInt {
-    #[inline]
-    fn eq(&self, other: &BigInt) -> bool {
-        debug_assert!(self.test_invariant() && other.test_invariant());
-        unimplemented!()
-    }
-}
-
-
-// Now we can compare `BigInt`s. Rust treats `PratialEq` special in that it is wired to the operator `==`:
-fn compare_big_ints() {
-    let b1 = BigInt::new(13);
-    let b2 = BigInt::new(37);
-    println!("b1 == b1: {} ; b1 == b2: {}; b1 != b2: {}", b1 == b1, b1 == b2, b1 != b2);
-}
-
-// ## Testing
-// With our equality test written, we are now ready to write our first testcase.
-// the `test` attribute. `assert!` is like `debug_assert!`, but does not get compiled away in a release build.
-#[test]
-fn test_min() {
-    let b1 = BigInt::new(1);
-    let b2 = BigInt::new(42);
-    let b3 = BigInt::from_vec(vec![0, 1]);
-
-    unimplemented!()
-}
-// Now run `cargo test` to execute the test. If you implemented `min` correctly, it should all work!
-
-// ## Formatting
-
-// All formating is handled by [`std::fmt`](http://doc.rust-lang.org/std/fmt/index.html). I won't explain
-// all the details, and refer you to the documentation instead.
-use std::fmt;
-
-impl fmt::Debug for BigInt {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.data.fmt(f)
-    }
-}
-
-// Now we are ready to use `assert_eq!` to test `vec_min`.
-/*#[test]*/
-fn test_vec_min() {
-    let b1 = BigInt::new(1);
-    let b2 = BigInt::new(42);
-    let b3 = BigInt::from_vec(vec![0, 1]);
-
-    let v1 = vec![b2.clone(), b1.clone(), b3.clone()];
-    let v2 = vec![b2.clone(), b3.clone()];
-    unimplemented!()
-}
-
-// **Exercise 07.1**: Add some more testcases. In particular, make sure you test the behavior of
-// `vec_min` on an empty vector. Also add tests for `BigInt::from_vec` (in particular, removing
-// trailing zeros). Finally, break one of your functions in a subtle way and watch the test fail.
-// 
-// **Exercise 07.2**: Go back to your good ol' `SomethingOrNothing`, and implement `Display` for it. (This will,
-// of course, need a `Display` bound on `T`.) Then you should be able to use them with `println!` just like you do
-// with numbers, and get rid of the inherent functions to print `SomethingOrNothing<i32>` and `SomethingOrNothing<f32>`.
-