34 lines
642 B
Plaintext
34 lines
642 B
Plaintext
// borrow.bux — Test explicit borrow expressions
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struct Point {
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x: int;
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y: int;
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}
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// NOT @[Checked] — borrow keyword available everywhere
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func MovePoint(p: *Point) {
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let ref: &Point = borrow &p;
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let x: int = (*ref).x;
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}
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// @[Checked] enables borrow protection
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@[Checked]
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func SwapPoints(a: *Point, b: *Point) {
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let ra: &mut Point = borrow &mut a;
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let rb: &mut Point = borrow &mut b;
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let tmp: int = (*ra).x;
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(*ra).x = (*rb).x;
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(*rb).x = tmp;
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}
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func Main() -> int {
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var p1: Point;
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p1.x = 10;
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p1.y = 20;
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var p2: Point;
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p2.x = 30;
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p2.y = 40;
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SwapPoints(&p1, &p2);
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return 0;
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}
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