[QC-1176] added tools to QC to check whether objects is mergeable (#13472)

* added tools to QC to check whether objects is mergeable

* fix copyright, fix comment

---------

Co-authored-by: Michal Tichák <michal.tichak@cern.ch>

Author: justonedev1

Utilities/Mergers/CMakeLists.txt

@@ -12,8 +12,9 @@
 # FIXME: the LinkDef should not be in the public area
 
 o2_add_library(Mergers
-               SOURCES src/MergerAlgorithm.cxx src/IntegratingMerger.cxx src/MergerInfrastructureBuilder.cxx
-                       src/MergerBuilder.cxx src/FullHistoryMerger.cxx src/ObjectStore.cxx
+               SOURCES src/FullHistoryMerger.cxx src/IntegratingMerger.cxx src/Mergeable.cxx
+                       src/MergerAlgorithm.cxx src/MergerBuilder.cxx src/MergerInfrastructureBuilder.cxx
+                       src/ObjectStore.cxx
                PUBLIC_LINK_LIBRARIES O2::Framework AliceO2::InfoLogger)
 
 o2_target_root_dictionary(

Utilities/Mergers/include/Mergers/Mergeable.h

@@ -0,0 +1,52 @@
+// Copyright 2019-2024 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+#ifndef ALICEO2_MERGERS_H
+#define ALICEO2_MERGERS_H
+
+/// \file Mergeable.h
+/// \brief Mergeable concept.
+///
+/// \author Michal Tichak, michal.tichak@cern.ch
+
+#include <concepts>
+
+class TObject;
+class TH1;
+class TCollection;
+class TObjArray;
+class TH1;
+class TTree;
+class THnBase;
+class TEfficiency;
+class TGraph;
+class TCanvas;
+
+namespace o2::mergers
+{
+
+class MergeInterface;
+
+template <typename T, typename... Ts>
+constexpr bool IsDerivedFrom = (std::derived_from<T, Ts> || ...);
+
+// \brief Concept to be used to test if some parameter is mergeable
+//
+// \parameter T type to be restricted
+template <typename T>
+concept Mergeable = IsDerivedFrom<std::remove_pointer_t<T>, mergers::MergeInterface, TCollection, TH1, TTree, TGraph, TEfficiency, THnBase>;
+
+// \brief runtime check whether TObject is mergeable
+bool isMergeable(TObject* obj);
+
+} // namespace o2::mergers
+
+#endif

Utilities/Mergers/src/Mergeable.cxx

@@ -0,0 +1,36 @@
+// Copyright 2019-2024 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+#include <TCollection.h>
+#include <TEfficiency.h>
+#include <TGraph.h>
+#include <TH1.h>
+#include <THnBase.h>
+#include <TObject.h>
+#include <TTree.h>
+#include "Mergers/MergeInterface.h"
+#include "Mergers/Mergeable.h"
+
+namespace o2::mergers
+{
+
+bool isMergeable(TObject* obj)
+{
+  return obj->InheritsFrom(mergers::MergeInterface::Class()) ||
+         obj->InheritsFrom(TCollection::Class()) ||
+         obj->InheritsFrom(TH1::Class()) ||
+         obj->InheritsFrom(THnBase::Class()) ||
+         obj->InheritsFrom(TTree::Class()) ||
+         obj->InheritsFrom(TGraph::Class()) ||
+         obj->InheritsFrom(TEfficiency::Class());
+}
+
+} // namespace o2::mergers