db/DatabaseListener: add `noexcept`

src/Instance.cxx

@@ -88,7 +88,7 @@ Instance::GetDatabaseOrThrow() const
 }
 
 void
-Instance::OnDatabaseModified()
+Instance::OnDatabaseModified() noexcept
 {
 	assert(database != nullptr);
 
@@ -101,7 +101,7 @@ Instance::OnDatabaseModified()
 }
 
 void
-Instance::OnDatabaseSongRemoved(const char *uri)
+Instance::OnDatabaseSongRemoved(const char *uri) noexcept
 {
 	assert(database != nullptr);
 

src/Instance.hxx

@@ -178,8 +178,9 @@ struct Instance final
 
 private:
 #ifdef ENABLE_DATABASE
-	void OnDatabaseModified() override;
-	void OnDatabaseSongRemoved(const char *uri) override;
+	/* virtual methods from class DatabaseListener */
+	void OnDatabaseModified() noexcept override;
+	void OnDatabaseSongRemoved(const char *uri) noexcept override;
 #endif
 
 #ifdef ENABLE_NEIGHBOR_PLUGINS

src/db/DatabaseListener.hxx

@@ -34,13 +34,13 @@ public:
 	 * thread that has created the #Database instance and that
 	 * runs the #EventLoop.
 	 */
-	virtual void OnDatabaseModified() = 0;
+	virtual void OnDatabaseModified() noexcept = 0;
 
 	/**
 	 * During database update, a song is about to be removed from
 	 * the database because the file has disappeared.
 	 */
-	virtual void OnDatabaseSongRemoved(const char *uri) = 0;
+	virtual void OnDatabaseSongRemoved(const char *uri) noexcept = 0;
 };
 
 #endif

test/DumpDatabase.cxx

@@ -68,11 +68,11 @@ InputStream::LockRead(void *, size_t)
 
 class MyDatabaseListener final : public DatabaseListener {
 public:
-	virtual void OnDatabaseModified() override {
+	virtual void OnDatabaseModified() noexcept override {
 		cout << "DatabaseModified" << endl;
 	}
 
-	virtual void OnDatabaseSongRemoved(const char *uri) override {
+	virtual void OnDatabaseSongRemoved(const char *uri) noexcept override {
 		cout << "SongRemoved " << uri << endl;
 	}
 };