Idle: convert anonymous enum to constexpr

src/Idle.hxx

@@ -25,41 +25,39 @@
 #ifndef MPD_IDLE_HXX
 #define MPD_IDLE_HXX
 
-enum {
-	/** song database has been updated*/
-	IDLE_DATABASE = 0x1,
+/** song database has been updated*/
+static constexpr unsigned IDLE_DATABASE = 0x1;
 
-	/** a stored playlist has been modified, created, deleted or
-	    renamed */
-	IDLE_STORED_PLAYLIST = 0x2,
+/** a stored playlist has been modified, created, deleted or
+    renamed */
+static constexpr unsigned IDLE_STORED_PLAYLIST = 0x2;
 
-	/** the current playlist has been modified */
-	IDLE_PLAYLIST = 0x4,
+/** the current playlist has been modified */
+static constexpr unsigned IDLE_PLAYLIST = 0x4;
 
-	/** the player state has changed: play, stop, pause, seek, ... */
-	IDLE_PLAYER = 0x8,
+/** the player state has changed: play, stop, pause, seek, ... */
+static constexpr unsigned IDLE_PLAYER = 0x8;
 
-	/** the volume has been modified */
-	IDLE_MIXER = 0x10,
+/** the volume has been modified */
+static constexpr unsigned IDLE_MIXER = 0x10;
 
-	/** an audio output device has been enabled or disabled */
-	IDLE_OUTPUT = 0x20,
+/** an audio output device has been enabled or disabled */
+static constexpr unsigned IDLE_OUTPUT = 0x20;
 
-	/** options have changed: crossfade, random, repeat, ... */
-	IDLE_OPTIONS = 0x40,
+/** options have changed: crossfade; random; repeat; ... */
+static constexpr unsigned IDLE_OPTIONS = 0x40;
 
-	/** a sticker has been modified. */
-	IDLE_STICKER = 0x80,
+/** a sticker has been modified. */
+static constexpr unsigned IDLE_STICKER = 0x80;
 
-	/** a database update has started or finished. */
-	IDLE_UPDATE = 0x100,
+/** a database update has started or finished. */
+static constexpr unsigned IDLE_UPDATE = 0x100;
 
-	/** a client has subscribed or unsubscribed to/from a channel */
-	IDLE_SUBSCRIPTION = 0x200,
+/** a client has subscribed or unsubscribed to/from a channel */
+static constexpr unsigned IDLE_SUBSCRIPTION = 0x200;
 
-	/** a message on the subscribed channel was received */
-	IDLE_MESSAGE = 0x400,
-};
+/** a message on the subscribed channel was received */
+static constexpr unsigned IDLE_MESSAGE = 0x400;
 
 /**
  * Adds idle flag (with bitwise "or") and queues notifications to all