layer defines to enum

keyboards/planck/keymaps/default/keymap.c

@@ -14,13 +14,16 @@ extern keymap_config_t keymap_config;
 // The underscores don't mean anything - you can have a layer called STUFF or any other name.
 // Layer names don't all need to be of the same length, obviously, and you can also skip them
 // entirely and just use numbers.
-#define _QWERTY 0
-#define _COLEMAK 1
-#define _DVORAK 2
-#define _LOWER 3
-#define _RAISE 4
-#define _PLOVER 5
-#define _ADJUST 16
+
+enum planck_layers {
+  _QWERTY,
+  _COLEMAK,
+  _DVORAK,
+  _LOWER,
+  _RAISE,
+  _PLOVER,
+  _ADJUST
+};
 
 enum planck_keycodes {
   QWERTY = SAFE_RANGE,