lecture 3 stuff

lectures/03/closures.rs

@@ -0,0 +1,29 @@
+fn main() {
+    let v = vec![3, 2, 7, 6, 8];
+    println!("{v:?}");
+    let c = || { println!("{v:?}"); };  // Fn
+    println!("{v:?}");
+    c();
+    c();
+
+    let mut v = vec![3, 2, 7, 6, 8];
+    println!("{v:?}");
+    let mut c = |x| { v.push(x); };  // FnMut
+    // println!("{v:?}");
+    c(1);
+    c(2);
+    println!("{v:?}");
+
+    let v = vec![3, 2, 7, 6, 8];
+    let c = || { drop(v); };  // FnOnce
+    // println!("{v:?}");
+    c();
+    // c();  // ERROR
+
+    let v = vec![3, 2, 7, 6, 8];
+    let c = move || { println!("{v:?}"); };  // v moved in c; c is still Fn
+    // println!("{v:?}"); 
+    c();
+    c();
+}
+