diff options
author | Adam Carpenter <53hornet@gmail.com> | 2019-03-27 15:32:37 -0400 |
---|---|---|
committer | Adam Carpenter <53hornet@gmail.com> | 2019-03-27 15:32:37 -0400 |
commit | 67cdcc2e12118becb823e20a40cc2687f2b8425a (patch) | |
tree | ed92c3234b89079e6d4cf36f5e80c5ffa79def48 /meap/meap-code/ch3/ch3-files-with-modes.rs | |
parent | e25482fca375d318a39c3b54db396b0db6e0b263 (diff) | |
download | learning-rust-67cdcc2e12118becb823e20a40cc2687f2b8425a.tar.xz learning-rust-67cdcc2e12118becb823e20a40cc2687f2b8425a.zip |
Started Rust in Action MEAP.
Diffstat (limited to 'meap/meap-code/ch3/ch3-files-with-modes.rs')
-rw-r--r-- | 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 100644 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 |