X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/63b7a79069a399c32d575bb71832fcad134117c9..530115b3acbf1d7503b4065f12fd0879708a5c90:/src/part05.rs?ds=sidebyside diff --git a/src/part05.rs b/src/part05.rs index 71d712a..adbe5c7 100644 --- a/src/part05.rs +++ b/src/part05.rs @@ -47,7 +47,8 @@ impl BigInt { } } - // We can convert any vector of digits into a number, by removing trailing zeros. The `mut` + // Any vector of digits, which meets the structure of BigInt's `data` field, can be easily + // converted into a big number just by removing trailing zeros. The `mut` // declaration for `v` here is just like the one in `let mut ...`: We completely own `v`, but Rust // still asks us to make our intention of modifying it explicit. This `mut` is *not* part of the // type of `from_vec` - the caller has to give up ownership of `v` anyway, so they don't care anymore @@ -124,7 +125,7 @@ enum Variant { Text(String), } //@ Now consider the following piece of code. Like above, `n` will be a reference to a part of `var`, -//@ and since we wrote `ref mut`, the reference will be exclusive and mutable. In other words, right after the match, `ptr` +//@ and since we wrote `ref mut`, the reference will be unique and mutable. In other words, right after the match, `ptr` //@ points to the number that's stored in `var`, where `var` is a `Number`. Remember that `_` means //@ "we don't care". fn work_on_variant(mut var: Variant, text: String) { @@ -147,4 +148,4 @@ fn work_on_variant(mut var: Variant, text: String) { //@ I hope this example clarifies why Rust has to rule out mutation in the presence of aliasing *in general*, //@ not just for the specific case of a buffer being reallocated, and old pointers becoming hence invalid. -//@ [index](main.html) | [previous](part04.html) | [raw source](https://www.ralfj.de/git/rust-101.git/blob_plain/HEAD:/workspace/src/part05.rs) | [next](part06.html) +//@ [index](main.html) | [previous](part04.html) | [raw source](workspace/src/part05.rs) | [next](part06.html)