From 7e8ee5ed9cad6484e9f13f81731b102ced58402e Mon Sep 17 00:00:00 2001
From: Adam Carpenter <gitlab@53hor.net>
Date: Tue, 9 Jul 2019 15:14:04 -0400
Subject: Init.

---
 meap/meap-code/ch3/ch3-not-quite-file-4.rs | 42 ++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100755 meap/meap-code/ch3/ch3-not-quite-file-4.rs

(limited to 'meap/meap-code/ch3/ch3-not-quite-file-4.rs')

diff --git a/meap/meap-code/ch3/ch3-not-quite-file-4.rs b/meap/meap-code/ch3/ch3-not-quite-file-4.rs
new file mode 100755
index 0000000..4c3dbfd
--- /dev/null
+++ b/meap/meap-code/ch3/ch3-not-quite-file-4.rs
@@ -0,0 +1,42 @@
+#[derive(Debug)] // <1>
+struct File {
+  name: String,
+  data: Vec<u8>, // <2>
+  state: &'static str,
+}
+
+type FileMode = &'static str;
+
+const OPEN: FileMode = "open";
+const CLOSED: FileMode = "closed";
+
+fn open(f: &mut File) -> bool {
+    f.state = OPEN;
+    true // <3> let's assume for the moment that this always succeeds
+}
+
+fn close(f: &mut File) -> bool {
+    f.state = CLOSED;
+    true // <3>
+}
+
+fn read(f: &File) -> (usize, Vec<u8>) {
+    (f.data.len(), f.data.clone())
+}
+
+fn main() {
+  let mut f2 = File { 
+    name: String::from("2.txt"), // <3>
+    data: vec![],
+    state: CLOSED,
+  };
+
+  let f2_name = &f2.name.clone(); // <5>
+
+  open(&mut f2);
+  let (f2_length, _) = read(&f2);
+  close(&mut f2);
+  
+  println!("{:?}", f2);
+  println!("{} is {} bytes long", f2_name, f2_length);
+}
\ No newline at end of file
-- 
cgit v1.2.3