18

1 files changed, 32 insertions, 0 deletions

diff --git a/18/src/types.rs b/18/src/types.rs
new file mode 100644
index 0000000..6800fdc
--- /dev/null
+++ b/18/src/types.rs
@@ -0,0 +1,32 @@
+use std::fmt;
+
+
+#[derive(Clone)]
+pub enum Value {
+  Literal(i64),
+  Pair(Box<Pair>),
+}
+
+#[derive(Clone)]
+pub struct Pair {
+  pub left: Value,
+  pub right: Value,
+}
+
+
+impl fmt::Debug for Value {
+  fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+    match self {
+      Value::Literal(n) => { write!(formatter, "{}", n) }
+      Value::Pair(pair) => { write!(formatter, "{:?}", pair) }
+    }
+  }
+}
+
+
+impl fmt::Debug for Pair {
+  fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+    write!(formatter, "[{:?},{:?}]", self.left, self.right)
+  }
+}
+