initial commitHEADmaster

1 files changed, 24 insertions, 0 deletions

diff --git a/examples/13_trait.rs b/examples/13_trait.rs
new file mode 100644
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--- /dev/null
+++ b/examples/13_trait.rs
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+trait Area {
+    fn area (&self) -> f64;
+}
+struct Rectangle {
+    width:  f64,
+    height: f64,
+}
+impl Area for Rectangle {
+    fn area (&self) -> f64 { self.width * self.height }
+}
+struct Circle {
+    radius: f64,
+}
+impl Area for Circle {
+    fn area (&self) -> f64 { 3.14 * self.radius * self.radius }
+}
+fn print_area<T: Area> (shape: T) {
+    println!("{}", shape.area());
+}
+fn main () {
+    print_area(Circle { radius: 2.0 });
+    print_area(Rectangle { width: 3.2, height: 4.5 });
+}
+