strum1: Add AsRefStr

strum1/Cargo.toml

@@ -7,3 +7,6 @@ edition = "2021"
 
 [dependencies]
 strum = { version = "0.24.1", features = ["derive"] }
+
+[dev-dependencies]
+anyhow = "1.0.68"

strum1/README.md

@@ -0,0 +1,5 @@
+# strum
+
+[crates:strum] の例を書く。
+
+[crates:strum]: https://crates.io/crates/strum

strum1/src/as_ref_str.rs

@@ -0,0 +1,27 @@
+// <https://docs.rs/strum_macros/0.24.1/strum_macros/derive.AsRefStr.html>
+// impl X for AsRef<str> を追加できる
+
+#[allow(dead_code)]
+#[derive(strum::AsRefStr)]
+enum E1 {
+    A1,
+    #[strum(serialize = "b")]
+    B1,
+    C1(usize),
+    D1 {
+        s: String,
+    },
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn e1_test() {
+        assert_eq!(E1::A1.as_ref(), "A1");
+        assert_eq!(E1::B1.as_ref(), "b");
+        assert_eq!(E1::C1(10).as_ref(), "C1");
+        assert_eq!(E1::D1 { s: "s1".to_owned() }.as_ref(), "D1");
+    }
+}

strum1/src/enum_count.rs

@@ -0,0 +1,23 @@
+// <https://docs.rs/strum_macros/0.24.1/strum_macros/derive.EnumCount.html>
+// EnumCount は COUNT を追加できる
+
+#[allow(dead_code)]
+#[derive(strum::EnumCount)]
+enum E1 {
+    A1,
+    B1,
+    C1,
+}
+
+#[cfg(test)]
+mod tests {
+    // これがないと E1::COUNT とできない
+    use strum::EnumCount;
+
+    use super::*;
+
+    #[test]
+    fn e1_test() {
+        assert_eq!(E1::COUNT, 3);
+    }
+}

strum1/src/main.rs

@@ -1,24 +1,39 @@
-// <https://docs.rs/strum_macros/0.24.1/strum_macros/derive.EnumCount.html>
-// EnumCount は COUNT を追加できる
+mod as_ref_str;
+mod enum_count;
 
 #[allow(dead_code)]
-#[derive(strum::EnumCount)]
+#[derive(Debug, Eq, PartialEq, strum::EnumString)]
 enum E1 {
     A1,
+    #[strum(serialize = "b")]
     B1,
-    C1,
+    C1(usize),
+    D1 {
+        // TODO: Default が取れない場合
+        s: String,
+    },
 }
 
 #[cfg(test)]
 mod tests {
-    // これがないと E1::COUNT とできない
-    use strum::EnumCount;
+    use std::str::FromStr;
 
     use super::*;
 
     #[test]
-    fn e1_test() {
-        assert_eq!(E1::COUNT, 3);
+    fn e1_test() -> anyhow::Result<()> {
+        assert_eq!(E1::A1, E1::from_str("A1")?);
+        assert_eq!(E1::A1, E1::try_from("A1")?);
+        assert!(E1::from_str("B1").is_err());
+        assert_eq!(E1::B1, E1::try_from("b")?);
+        assert_eq!(E1::C1(0), E1::try_from("C1")?);
+        assert_eq!(
+            E1::D1 {
+                s: String::default()
+            },
+            E1::try_from("D1")?
+        );
+        Ok(())
     }
 }