db/LightSong: pass URI to constructor

src/DetachedSong.cxx

@@ -33,9 +33,8 @@ DetachedSong::DetachedSong(const LightSong &other)
 
 DetachedSong::operator LightSong() const noexcept
 {
-	LightSong result(tag);
+	LightSong result(uri.c_str(), tag);
 	result.directory = nullptr;
-	result.uri = uri.c_str();
 	result.real_uri = real_uri.empty() ? nullptr : real_uri.c_str();
 	result.mtime = mtime;
 	result.start_time = start_time;

src/db/LightSong.hxx

@@ -78,8 +78,8 @@ struct LightSong {
 	 */
 	SongTime end_time = SongTime::zero();
 
-	explicit LightSong(const Tag &_tag) noexcept
-		:tag(_tag) {}
+	LightSong(const char *_uri, const Tag &_tag) noexcept
+		:uri(_uri), tag(_tag) {}
 
 	gcc_pure
 	std::string GetURI() const noexcept {

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -203,10 +203,8 @@ Copy(TagBuilder &tag, TagType d_tag,
 }
 
 ProxySong::ProxySong(const mpd_song *song)
-	:LightSong(tag2)
+	:LightSong(mpd_song_get_uri(song), tag2)
 {
-	uri = mpd_song_get_uri(song);
-
 	const auto _mtime = mpd_song_get_last_modified(song);
 	if (_mtime > 0)
 		mtime = std::chrono::system_clock::from_time_t(_mtime);

src/db/plugins/simple/Song.cxx

@@ -98,10 +98,9 @@ Song::GetURI() const noexcept
 LightSong
 Song::Export() const noexcept
 {
-	LightSong dest(tag);
+	LightSong dest(uri, tag);
 	dest.directory = parent->IsRoot()
 		? nullptr : parent->GetPath();
-	dest.uri = uri;
 	dest.real_uri = nullptr;
 	dest.mtime = mtime;
 	dest.start_time = start_time;

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -48,18 +48,24 @@
 
 static const char *const rootid = "0";
 
-class UpnpSong : public LightSong {
-	std::string uri2, real_uri2;
+class UpnpSongData {
+protected:
+	std::string uri;
+	Tag tag;
+
+	template<typename U, typename T>
+	UpnpSongData(U &&_uri, T &&_tag) noexcept
+		:uri(std::forward<U>(_uri)), tag(std::forward<T>(_tag)) {}
+};
 
-	Tag tag2;
+class UpnpSong : UpnpSongData, public LightSong {
+	std::string real_uri2;
 
 public:
 	UpnpSong(UPnPDirObject &&object, std::string &&_uri)
-		:LightSong(tag2),
-		 uri2(std::move(_uri)),
-		 real_uri2(std::move(object.url)),
-		 tag2(std::move(object.tag)) {
-		uri = uri2.c_str();
+		:UpnpSongData(std::move(_uri), std::move(object.tag)),
+		 LightSong(UpnpSongData::uri.c_str(), UpnpSongData::tag),
+		 real_uri2(std::move(object.url)) {
 		real_uri = real_uri2.c_str();
 	}
 };
@@ -318,8 +324,7 @@ visitSong(const UPnPDirObject &meta, const char *path,
 	if (!visit_song)
 		return;
 
-	LightSong song(meta.tag);
-	song.uri = path;
+	LightSong song(path, meta.tag);
 	song.real_uri = meta.url.c_str();
 
 	if (selection.Match(song))