diff -r 68026fe3aaf5 -r 7230e1ea0b07 src/lib/ASN1ContentHandler.h
--- a/src/lib/ASN1ContentHandler.h	Sun Mar 14 19:58:35 2021 +0100
+++ b/src/lib/ASN1ContentHandler.h	Sat Jun 12 18:34:19 2021 +0200
@@ -16,14 +16,53 @@
  */
 #pragma once
 
+#include <memory>
+#include <vector>
+
 namespace relpipe {
 namespace in {
 namespace asn1 {
 namespace lib {
 
 class ASN1ContentHandler {
+public:
+
+	virtual ~ASN1ContentHandler() = default;
+
+	virtual void abc() = 0; // FIXME: remove dummy method
+	virtual void def(int a) = 0; // FIXME: remove dummy method
+	virtual void ghi(int a, int b) = 0; // FIXME: remove dummy method
+
 };
 
+class ASN1ContentHandlerProxy : public ASN1ContentHandler {
+private:
+	std::vector<std::shared_ptr<ASN1ContentHandler>> handlers;
+public:
+
+	void addHandler(std::shared_ptr<ASN1ContentHandler> handler) {
+		handlers.push_back(handler);
+	}
+
+#define handler for (auto ___h : handlers) ___h
+
+	void abc() override {
+		handler->abc();
+	}
+
+	void def(int a) override {
+		handler->def(a);
+	}
+
+	void ghi(int a, int b) override {
+		handler->ghi(a, b);
+	}
+
+#undef handler
+
+};
+
+
 }
 }
 }