diff -r e1ced2523cad -r 008989bc7d6e src/main.h
--- a/src/main.h	Tue Nov 02 15:43:57 2021 +0200
+++ b/src/main.h	Tue Mar 01 17:00:19 2022 +0200
@@ -226,6 +226,21 @@
 	>{map};
 }
 
+template<typename K, typename V, typename Fn>
+void mapapply(const QMap<K, V>& map, Fn fn)
+{
+	for (
+		 typename QMap<K, V>::const_iterator it = map.constBegin();
+		 it != map.constEnd();
+		 ++it
+	) {
+		fn(it.key(), it.value());
+	}
+}
+
+#define MAP_PARMS(map) decltype(map)::key_type const& key, decltype(map)::mapped_type& value
+#define MAP_CPARMS(map) decltype(map)::key_type const& key, decltype(map)::mapped_type const& value
+
 template<typename T, typename IdentifierType>
 struct TypeValue
 {