RAttrValue.hxx

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/*************************************************************************
 * Copyright (C) 1995-2020, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT7_RAttrValue
#define ROOT7_RAttrValue
 
#include <ROOT/RAttrBase.hxx>
 
namespace ROOT {
namespace Experimental {
 
/** \class RAttrValue
\ingroup GpadROOT7
\author Sergey Linev <s.linev@gsi.de>
\date 2020-06-24
\brief Template class to access single value from drawable or other attributes
\warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback is welcome!
*/
 
 
template<typename T>
class RAttrValue : public RAttrBase {
protected:
 
   RAttrMap  fDefaults;    ///<!    map with default values
 
   const RAttrMap &GetDefaults() const override { return fDefaults; }
 
   bool IsValue() const override { return true; }
 
public:
 
   RAttrValue() = default;
 
   RAttrValue(RDrawable *drawable, const std::string &name, const T &dflt = T())
   {
      fDefaults.AddValue("", dflt);
      AssignDrawable(drawable, name);
   }
 
   RAttrValue(RAttrBase *parent, const std::string &name, const T &dflt = T())
   {
      fDefaults.AddValue("", dflt);
      AssignParent(parent, name);
   }
 
   void Set(const T &v) { SetValue("", v); }
   T Get() const { return GetValue<T>(""); }
   void Clear() { ClearValue(""); }
   bool Has() const { return HasValue<T>(""); }
 
   RAttrValue &operator=(const T &v) { Set(v); return *this; }
 
   operator T() const { return Get(); }
};
 
} // namespace Experimental
} // namespace ROOT
 
#endif // ROOT7_RAttrValue