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doc: Fix explanation and example of struct-like enum variants. rs=busted

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Patrick Walton 2012-12-30 07:09:14 -08:00
parent 4b3dd4b920
commit 4be7310be0
1 changed files with 6 additions and 6 deletions
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doc/tutorial.md
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@ -733,9 +733,7 @@ fn point_from_direction(dir: Direction) -> Point {
}
~~~~
A special kind of enum variant, called _struct-like enums_,
can have its fields extracted with dot notation and not just destructuring.
For example:
Enum variants may also be structs. For example:
~~~~
# use core::float;
@ -743,12 +741,14 @@ For example:
# fn square(x: float) -> float { x * x }
enum Shape {
Circle { center: Point, radius: float },
Rectangle { left: Point, right: Point }
Rectangle { top_left: Point, bottom_right: Point }
}
fn area(sh: Shape) -> float {
match sh {
Circle(c) => float::consts::pi * square(c.radius),
Rectangle(r) => r.right.x - r.left.x * r.right.y - r.right.y
Circle { radius: radius, _ } => float::consts::pi * square(radius),
Rectangle { top_left: top_left, bottom_right: bottom_right } => {
(bottom_right.x - top_left.x) * (bottom_right.y - top_left.y)
}
}
}
~~~~