X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=blobdiff_plain;f=concepts%2Fsrc%2Flib.rs;fp=concepts%2Fsrc%2Flib.rs;h=5f1feea9404c8116e1cbb1106b825e5a6d52c677;hp=b0839ad391739cb186adcf2bb81c97484c5a3dfe;hb=d6fbfabfaf434ae365854f0587547cff3ca78dae;hpb=1962a5412d16f34c738e9f81bb5271da043a7505

diff --git a/concepts/src/lib.rs b/concepts/src/lib.rs
index b0839ad..5f1feea 100644
--- a/concepts/src/lib.rs
+++ b/concepts/src/lib.rs
@@ -210,3 +210,46 @@ impl State for Published {
         &post.content
     }
 }
+
+// state encoded as types; this is the "approved" state
+pub struct TPost {
+    content: String,
+}
+
+impl TPost {
+    pub fn new() -> TPostDraft {
+        TPostDraft {content: String::new()}
+    }
+
+    pub fn content(&self) -> &str {
+        &self.content
+    }
+}
+
+pub struct TPostDraft {
+    content: String,
+}
+
+impl TPostDraft {
+    pub fn add_text(&mut self, text: &str) {
+        self.content.push_str(text);
+    }
+
+    pub fn request_review(self) -> TPostReview {
+        TPostReview {content: self.content}
+    }
+}
+
+pub struct TPostReview {
+    content: String,
+}
+
+impl TPostReview {
+    pub fn approve(self) -> TPost {
+        TPost {content: self.content}
+    }
+
+    pub fn reject(self) -> TPostDraft {
+        TPostDraft {content: self.content}
+    }
+}