From df5ba007bbf8cb734f149c0d4b162c1f18c3dc9d Mon Sep 17 00:00:00 2001
From: silviodonato <silvio.donato@cern.ch>
Date: Wed, 17 Jan 2024 11:26:15 +0100
Subject: [PATCH 1/2] add fillDescription in
 CommonTools/UtilAlgos/interface/Merger.h

---
 CommonTools/UtilAlgos/interface/Merger.h | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/CommonTools/UtilAlgos/interface/Merger.h b/CommonTools/UtilAlgos/interface/Merger.h
index 63c72cc1fe6fd..ef6d41172e5d1 100644
--- a/CommonTools/UtilAlgos/interface/Merger.h
+++ b/CommonTools/UtilAlgos/interface/Merger.h
@@ -19,6 +19,8 @@
  */
 #include "FWCore/Framework/interface/global/EDProducer.h"
 #include "FWCore/Framework/interface/Event.h"
+#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
+#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
 #include "FWCore/ParameterSet/interface/ParameterSet.h"
 #include "FWCore/Utilities/interface/transform.h"
 #include "FWCore/Utilities/interface/InputTag.h"
@@ -34,19 +36,20 @@ class Merger : public edm::global::EDProducer<> {
   explicit Merger(const edm::ParameterSet&);
   /// destructor
   ~Merger() override;
+  static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);
 
 private:
   /// process an event
   void produce(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
   /// vector of strings
-  typedef std::vector<edm::EDGetTokenT<InputCollection> > vtoken;
+  typedef std::vector<edm::EDGetTokenT<InputCollection>> vtoken;
   /// labels of the collections to be merged
   vtoken srcToken_;
 };
 
 template <typename InputCollection, typename OutputCollection, typename P>
 Merger<InputCollection, OutputCollection, P>::Merger(const edm::ParameterSet& par)
-    : srcToken_(edm::vector_transform(par.template getParameter<std::vector<edm::InputTag> >("src"),
+    : srcToken_(edm::vector_transform(par.template getParameter<std::vector<edm::InputTag>>("src"),
                                       [this](edm::InputTag const& tag) { return consumes<InputCollection>(tag); })) {
   produces<OutputCollection>();
 }
@@ -69,4 +72,15 @@ void Merger<InputCollection, OutputCollection, P>::produce(edm::StreamID,
   evt.put(std::move(coll));
 }
 
+template <typename InputCollection, typename OutputCollection, typename P>
+void Merger<InputCollection, OutputCollection, P>::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
+  edm::ParameterSetDescription desc;
+  desc.add<std::vector<edm::InputTag>>("src",
+                                       {
+                                           edm::InputTag("collection1"),
+                                           edm::InputTag("collection2"),
+                                       });
+  descriptions.add("simpleMergedTracks", desc);
+}
+
 #endif

From 366848638b155ed6a23c133df9c16917b3b39803 Mon Sep 17 00:00:00 2001
From: silviodonato <silvio.donato@cern.ch>
Date: Wed, 17 Jan 2024 14:21:02 +0100
Subject: [PATCH 2/2] use addWithDefaultLabel instead of add in fillDescription
 of Merger.h

---
 CommonTools/UtilAlgos/interface/Merger.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CommonTools/UtilAlgos/interface/Merger.h b/CommonTools/UtilAlgos/interface/Merger.h
index ef6d41172e5d1..054baa5943a7f 100644
--- a/CommonTools/UtilAlgos/interface/Merger.h
+++ b/CommonTools/UtilAlgos/interface/Merger.h
@@ -80,7 +80,7 @@ void Merger<InputCollection, OutputCollection, P>::fillDescriptions(edm::Configu
                                            edm::InputTag("collection1"),
                                            edm::InputTag("collection2"),
                                        });
-  descriptions.add("simpleMergedTracks", desc);
+  descriptions.addWithDefaultLabel(desc);
 }
 
 #endif