diff options
| author | Adam Carpenter <gitlab@53hor.net> | 2019-07-09 15:14:04 -0400 |
|---|---|---|
| committer | Adam Carpenter <gitlab@53hor.net> | 2019-07-09 15:14:04 -0400 |
| commit | 7e8ee5ed9cad6484e9f13f81731b102ced58402e (patch) | |
| tree | 5395402ab07bbb5a659dbd68c701e22a1227202f /meap/meap-code/ch3/ch3-files-with-modes.rs | |
| download | learning-rust-7e8ee5ed9cad6484e9f13f81731b102ced58402e.tar.xz learning-rust-7e8ee5ed9cad6484e9f13f81731b102ced58402e.zip | |
Init.
Diffstat (limited to 'meap/meap-code/ch3/ch3-files-with-modes.rs')
| -rwxr-xr-x | meap/meap-code/ch3/ch3-files-with-modes.rs | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/meap/meap-code/ch3/ch3-files-with-modes.rs b/meap/meap-code/ch3/ch3-files-with-modes.rs new file mode 100755 index 0000000..4440924 --- /dev/null +++ b/meap/meap-code/ch3/ch3-files-with-modes.rs @@ -0,0 +1,75 @@ +#[derive(Debug)]
+pub enum FileOpenMode {
+ Read,
+ Write,
+ Append,
+ Truncate,
+}
+
+#[derive(Debug)]
+pub enum FileHandle {
+ Handle(usize),
+ None,
+}
+
+#[derive(Debug)]
+pub enum FileState {
+ PendingCreation,
+ Created(FileOpenMode),
+ Opened(FileOpenMode),
+ Error(String),
+ Closed,
+ Deleted,
+}
+
+#[derive(Debug)]
+pub struct File {
+ name: String,
+ data: Vec<u8>,
+ state: FileState,
+ handle: FileHandle,
+}
+
+impl File {
+ pub fn new(name: &str) -> File {
+ File {
+ name: String::from(name),
+ data: Vec::new(),
+ state: FileState::PendingCreation, // <1>
+ handle: FileHandle::None, // <1>
+ }
+ }
+
+ pub fn from_options(name: &str, state: FileState, handle: FileHandle) -> File {
+ File {
+ name: String::from(name),
+ data: Vec::new(),
+ state: state,
+ handle: handle,
+ }
+ }
+}
+
+fn main() {
+ let f1 = File::new("f1.txt");
+ let f2 = File::from_options("f2.txt",
+ FileState::Opened(FileOpenMode::Read),
+ FileHandle::Handle(123)
+ );
+ let f3 = File::from_options("f3.txt",
+ FileState::Opened(FileOpenMode::Write),
+ FileHandle::None
+ );
+
+ let mut files = [f1, f2, f3];
+
+ for f in &files {
+ println!("{:?}", f);
+ }
+
+ // uh oh, disk failure
+ for ref mut f in &mut files {
+ f.state = FileState::Error(String::from("disk read failure"));
+ println!("{:?}", f);
+ }
+}
\ No newline at end of file |