X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/7c63fce3ed1474437f62a5f14cbd9fa398ec9abe..53b9ab56f7b712e6710fd873d456a0fe1f13b785:/src/part08.rs diff --git a/src/part08.rs b/src/part08.rs index 7b471b9..340de24 100644 --- a/src/part08.rs +++ b/src/part08.rs @@ -17,7 +17,7 @@ fn overflowing_add(a: u64, b: u64, carry: bool) -> (u64, bool) { //@ The reason for this is that many serious security vulnerabilities have been caused by integer overflows, so just assuming //@ "per default" that they are intended is dangerous.
//@ If you explicitly *do* want an overflow to happen, you can call the `wrapping_add` - //@ function (see [the documentation](http://doc.rust-lang.org/stable/std/primitive.u64.html#method.wrapping_add), + //@ function (see [the documentation](https://doc.rust-lang.org/stable/std/primitive.u64.html#method.wrapping_add), //@ there are similar functions for other arithmetic operations). There are also similar functions //@ `checked_add` etc. to enforce the overflow check. let sum = a.wrapping_add(b); @@ -57,7 +57,7 @@ fn test_overflowing_add() { impl ops::Add for BigInt { //@ Besides static functions and methods, traits can contain *associated types*: This is a type chosen by every particular implementation //@ of the trait. The methods of the trait can then refer to that type. In the case of addition, it is used to give the type of the result. - //@ (Also see the [documentation of `Add`](http://doc.rust-lang.org/stable/std/ops/trait.Add.html).) + //@ (Also see the [documentation of `Add`](https://doc.rust-lang.org/stable/std/ops/trait.Add.html).) //@ //@ In general, you can consider the two `BigInt` given above (in the `impl` line) *input* types of trait search: When //@ `a + b` is invoked with `a` having type `T` and `b` having type `U`, Rust tries to find an implementation of `Add` for @@ -91,13 +91,13 @@ impl ops::Add for BigInt { } } -// ## Traits and borrowed types +// ## Traits and reference types //@ If you inspect the addition function above closely, you will notice that it actually consumes ownership of both operands //@ to produce the result. This is, of course, in general not what we want. We'd rather like to be able to add two `&BigInt`. // Writing this out becomes a bit tedious, because trait implementations (unlike functions) require full explicit annotation // of lifetimes. Make sure you understand exactly what the following definition says. Notice that we can implement a trait for -// a borrowed type! +// a reference type! impl<'a, 'b> ops::Add<&'a BigInt> for &'b BigInt { type Output = BigInt; fn add(self, rhs: &'a BigInt) -> Self::Output { @@ -152,4 +152,4 @@ mod tests { // **Exercise 08.6**: Write a subtraction function, and testcases for it. Decide for yourself how you want to handle negative results. // For example, you may want to return an `Option`, to panic, or to return `0`. -//@ [index](main.html) | [previous](part07.html) | [next](part09.html) +//@ [index](main.html) | [previous](part07.html) | [raw source](https://www.ralfj.de/git/rust-101.git/blob_plain/HEAD:/workspace/src/part08.rs) | [next](part09.html)