X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/73bdc651abfbe484d9c97835efc4ad272c44d325..refs/heads/test:/src/part07.rs?ds=inline diff --git a/src/part07.rs b/src/part07.rs index 8f65c2b..b04d766 100644 --- a/src/part07.rs +++ b/src/part07.rs @@ -35,8 +35,8 @@ pub fn vec_min(v: &Vec) -> Option<&T> { //@ much safer to use. // **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 of `BigInt`! +// 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 of `BigInt`! impl Minimum for BigInt { fn min<'a>(&'a self, other: &'a Self) -> &'a Self { unimplemented!() @@ -44,7 +44,6 @@ impl Minimum for BigInt { } // ## Operator Overloading - //@ How can we know that our `min` function actually does what we want it to do? One possibility //@ here is to do *testing*. Rust comes with nice built-in support for both unit tests and //@ integration tests. However, before we go there, we need to have a way of checking whether the @@ -73,7 +72,6 @@ impl PartialEq for BigInt { // Now we can compare `BigInt`s. Rust treats `PartialEq` special in that it is wired to the operator // `==`: - //@ That operator can now be used on our numbers! Speaking in C++ terms, we just overloaded the //@ `==` operator for `BigInt`. Rust does not have function overloading (i.e., it will not dispatch //@ to different functions depending on the type of the argument). Instead, one typically finds (or @@ -155,7 +153,6 @@ fn test_vec_min() { // **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