diff -r ec750c536705 -r e11f1ad20826 src/DataTypeReaderBase.h
--- a/src/DataTypeReaderBase.h	Mon Aug 27 00:06:14 2018 +0200
+++ b/src/DataTypeReaderBase.h	Mon Sep 03 23:40:12 2018 +0200
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <string>
+#include <functional>
 #include "../include/relpipe/reader/TypeId.h"
 #include "../include/relpipe/reader/typedefs.h"
 
@@ -24,6 +25,8 @@
 	};
 
 	/**
+	 * TODO: delete, use handler?
+	 * 
 	 * @param input input stream, should be at position where the value is to be read; the stream will not be closed afred reading
 	 * @return read value in form of the string representation of given data type.
 	 * E.g. integer 123 is returned as a character string "123",
@@ -33,6 +36,22 @@
 	virtual string_t readString(std::istream &input) = 0;
 
 	/**
+	 * The value is read from the input and then passed to the handler.
+	 * 
+	 * @param input
+	 * @param handler
+	 */
+	virtual void read(std::istream &input, std::function<void(const void *, const std::type_info&) > handler) = 0;
+
+	/**
+	 * TODO: documentation
+	 * 
+	 * @param input
+	 * @param handler
+	 */
+	virtual void read(std::istream &input, std::function<void(const string_t&, const void *, const std::type_info&) > handler) = 0;
+
+	/**
 	 * @param dataType data type code as defined in DDP L0
 	 * @return whether this class supports conversions of this type
 	 */