a

1 files changed, 47 insertions, 0 deletions

diff --git a/examples/struct_closure_opt.zc b/examples/struct_closure_opt.zc
new file mode 100644
index 0000000..67315bf
--- /dev/null
+++ b/examples/struct_closure_opt.zc
@@ -0,0 +1,47 @@
+// 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;
+}