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// struct methods, closures and ownership in one file, written so the
// compiler's hints have something to say about it. it runs as it is.
struct point {
let x, y;
// methods get a hidden first parameter called this
fn dist(other) {
let dx = this.x - other.x;
let dy = this.y - other.y;
return dx * dx + dy * dy;
}
}
fn sink(.d p) { free(d*p); return 0; }
fn features() {
// a closure copies the variables it uses when it is made
let base = 100;
let add = fn(a, b) { return a + b + base; };
let total = add(10, 20);
let p1 = new(point);
p1.x = 5; p1.y = 12;
let p2 = new(point);
p2.x = 0; p2.y = 0;
// made and given away on the next line, so it never needed a name
let tmp = new(2);
sink(d*tmp);
// allocated again on every pass of the loop
let i = 0;
while (i < 3) {
let scratch = new(10);
scratch[0] = i;
sink(d*scratch);
i++;
}
return total + p1.dist(p2);
}
fn main() {
put_n(features()); put_c(10);
return 0;
}
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