feat: 枚举关联数据 ADT — enum Option { Some(i64), None }

2026-06-06 14:21:43 +08:00
parent 0ec3c3d65f
commit 0e1f8c5795
9 changed files with 172 additions and 37 deletions
@@ -0,0 +1,17 @@
+enum Option { Some(i64), None }
+
+fn main() -> i64 {
+    let s = Option::Some(42);
+    let n = Option::None;
+
+    // 打印 tag 值 (Some=0, None=1)
+    print_i64(s);
+    print_i64(n);
+
+    // match 判断是 Some 还是 None（只比较 tag）
+    match s {
+        Option::None => { print_i64(999); }
+        _ => { print_i64(100); }
+    }
+    return 0;
+}