v0.25

src/main/kotlin/blitz/math/Direction.kt

@@ -0,0 +1,29 @@
+package blitz.math
+
+import blitz.unreachable
+
+/** only 6 directions -> only needs 3 bits */
+@JvmInline
+value class Direction(
+    val idx: U3
+) {
+    companion object {
+        val UP = Direction(U3(0u))
+        val DOWN = Direction(U3(1u))
+        val NORTH = Direction(U3(2u))
+        val EAST = Direction(U3(3u))
+        val SOUTH = Direction(U3(4u))
+        val WEST = Direction(U3(5u))
+    }
+
+    override fun toString() =
+        when (this) {
+            UP -> "Up"
+            DOWN -> "Down"
+            NORTH -> "North"
+            EAST -> "East"
+            SOUTH -> "South"
+            WEST -> "West"
+            else -> unreachable()
+        }
+}