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tutorial: Fill out bounded type test case

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Brian Anderson 2012-07-08 01:12:43 -07:00
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doc/tutorial.md
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@ -2507,10 +2507,15 @@ values of *an* unknown type that conforms to a given interface.
However, consider this function:
~~~~
# type circle = int; type rectangle = int;
# iface drawable { fn draw(); }
# impl of drawable for int { fn draw() {} }
# fn new_circle() -> int { 1 }
fn draw_all<T: drawable>(shapes: ~[T]) {
for shapes.each |shape| { shape.draw(); }
}
# let c: circle = new_circle();
# draw_all(~[c]);
~~~~
You can call that on an array of circles, or an array of squares