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Explained asterisk on & and &mut reference

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Ruby 2015-08-06 19:29:03 +01:00
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src/doc/trpl/references-and-borrowing.md
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@ -125,6 +125,10 @@ This will print `6`. We make `y` a mutable reference to `x`, then add one to
the thing `y` points at. You’ll notice that `x` had to be marked `mut` as well, the thing `y` points at. You’ll notice that `x` had to be marked `mut` as well,
if it wasn’t, we couldn’t take a mutable borrow to an immutable value. if it wasn’t, we couldn’t take a mutable borrow to an immutable value.
You'll also notice we added an asterisk in front of `y`, making it `*y`,
this is because y is an `&mut` reference. You'll also need to use them for
accessing and modifying `&` references as well.
Otherwise, `&mut` references are just like references. There _is_ a large Otherwise, `&mut` references are just like references. There _is_ a large
difference between the two, and how they interact, though. You can tell difference between the two, and how they interact, though. You can tell
something is fishy in the above example, because we need that extra scope, with something is fishy in the above example, because we need that extra scope, with