fix broken compilation due to lack of setters for mpd_song

src/song.h

@@ -21,6 +21,7 @@
 #ifndef _SONG_H
 #define _SONG_H
 
+#include <map>
 #include <string>
 
 #include <mpd/client.h>
@@ -29,13 +30,14 @@ namespace MPD
 {
 	class Song
 	{
+		typedef std::map<std::pair<mpd_tag_type, unsigned>, std::string> TagMap;
+		
 		public:
 			
 			typedef void (Song::*SetFunction)(const std::string &);
 			typedef std::string (Song::*GetFunction)() const;
 			
-			Song() : itsSong(0), itsFile(0), itsSlash(std::string::npos), itsHash(0), copyPtr(0), isLocalised(0) { }
-			Song(mpd_song *, bool = 0);
+			Song(mpd_song * = 0, bool = 0);
 			Song(const Song &);
 			~Song();
 			
@@ -73,7 +75,6 @@ namespace MPD
 			void SetDisc(const std::string &);
 			void SetComment(const std::string &);
 			void SetPosition(unsigned);
-			void SetLength(unsigned);
 			
 			void SetNewName(const std::string &name) { itsNewName = name == GetName() ? "" : name; }
 			std::string GetNewName() const { return itsNewName; }
@@ -99,6 +100,9 @@ namespace MPD
 			void SetHashAndSlash();
 			std::string ParseFormat(std::string::const_iterator &it) const;
 			
+			void SetTag(mpd_tag_type, unsigned, const std::string &);
+			std::string GetTag(mpd_tag_type, unsigned) const;
+			
 			/// Used internally for handling filename, since we don't have
 			/// write access to file string in mpd_song, manage our own if
 			/// localization was done and there is localized filename that
@@ -112,6 +116,9 @@ namespace MPD
 			/// localized version of filename
 			const char *itsFile;
 			
+			/// map that contains localized tags or these set by tag editor
+			TagMap *itsTags;
+			
 			std::string itsNewName;
 			
 			size_t itsSlash;