[HistogramRegistry] add string handling for template form (AliceO2Group#13538)

Author: njacazio

Framework/Core/include/Framework/HistogramRegistry.h

@@ -104,6 +104,8 @@ class HistogramRegistry
   std::shared_ptr<T> add(char const* const name, char const* const title, const HistogramConfigSpec& histConfigSpec, bool callSumw2 = false);
   template <typename T>
   std::shared_ptr<T> add(char const* const name, char const* const title, HistType histType, const std::vector<AxisSpec>& axes, bool callSumw2 = false);
+  template <typename T>
+  std::shared_ptr<T> add(const std::string& name, char const* const title, HistType histType, const std::vector<AxisSpec>& axes, bool callSumw2 = false);
 
   void addClone(const std::string& source, const std::string& target);
 
@@ -369,6 +371,12 @@ std::shared_ptr<T> HistogramRegistry::add(char const* const name, char const* co
   }
 }
 
+template <typename T>
+std::shared_ptr<T> HistogramRegistry::add(const std::string& name, char const* const title, HistType histType, const std::vector<AxisSpec>& axes, bool callSumw2)
+{
+  return add<T>(name.c_str(), title, histType, axes, callSumw2);
+}
+
 template <typename T>
 std::shared_ptr<T> HistogramRegistry::get(const HistName& histName)
 {

Framework/Core/src/HistogramRegistry.cxx

@@ -121,7 +121,7 @@ HistPtr HistogramRegistry::add(char const* const name, char const* const title,
 
 HistPtr HistogramRegistry::add(const std::string& name, char const* const title, HistType histType, const std::vector<AxisSpec>& axes, bool callSumw2)
 {
-  return insert({name.c_str(), title, {histType, axes}, callSumw2});
+  return add(name.c_str(), title, histType, axes, callSumw2);
 }
 
 // store a copy of an existing histogram (or group of histograms) under a different name