Replace typedef with using

src/collection/collectionbackend.h

@@ -72,7 +72,7 @@ class CollectionBackendInterface : public QObject {
     Song::FileType filetype;
     QString cue_path;
   };
-  typedef QList<Album> AlbumList;
+  using AlbumList = QList<Album>;
 
   virtual QString songs_table() const = 0;
   virtual QString fts_table() const = 0;

src/collection/collectionmodel.h

@@ -308,7 +308,7 @@ class CollectionModel : public SimpleTreeModel<CollectionItem> {
 
   AlbumCoverLoaderOptions cover_loader_options_;
 
-  typedef QPair<CollectionItem*, QString> ItemAndCacheKey;
+  using ItemAndCacheKey = QPair<CollectionItem*, QString>;
   QMap<quint64, ItemAndCacheKey> pending_art_;
   QSet<QString> pending_cache_keys_;
 };

src/collection/directory.h

@@ -40,7 +40,7 @@ struct Directory {
 };
 Q_DECLARE_METATYPE(Directory)
 
-typedef QList<Directory> DirectoryList;
+using DirectoryList = QList<Directory>;
 Q_DECLARE_METATYPE(DirectoryList)
 
 
@@ -53,7 +53,7 @@ struct Subdirectory {
 };
 Q_DECLARE_METATYPE(Subdirectory)
 
-typedef QList<Subdirectory> SubdirectoryList;
+using SubdirectoryList = QList<Subdirectory>;
 Q_DECLARE_METATYPE(SubdirectoryList)
 
 #endif  // DIRECTORY_H

src/collection/groupbydialog.cpp

@@ -63,11 +63,7 @@ struct tag_group_by {};
 
 class GroupByDialogPrivate {
  private:
-  typedef multi_index_container<
-      Mapping,
-      indexed_by<
-          ordered_unique<tag<tag_index>, member<Mapping, int, &Mapping::combo_box_index> >,
-          ordered_unique<tag<tag_group_by>, member<Mapping, CollectionModel::GroupBy, &Mapping::group_by> > > > MappingContainer;
+  using MappingContainer = multi_index_container<Mapping, indexed_by<ordered_unique<tag<tag_index>, member<Mapping, int, &Mapping::combo_box_index>>, ordered_unique<tag<tag_group_by>, member<Mapping, CollectionModel::GroupBy, &Mapping::group_by>>>>;
 
  public:
   MappingContainer mapping_;