TConvertingBranchElement.h File Reference

A variant of TBranchElement that can call converters when reading objects in split mode. More...

#include <atomic>
#include "TBranchElement.h"

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Classes
class	TConvertingBranchElement
	A variant of TBranchElement that can call converters when reading objects in split mode. More...

Detailed Description

A variant of TBranchElement that can call converters when reading objects in split mode.

Author

scott snyder snyde.nosp@m.r@bn.nosp@m.l.gov

Date

Dec, 2006

This class adds the ability to call converters on classes being read in split mode. It is implemented as a derived class of TBranchElement. In order to use it, you must first register your converters with TConverterRegistry (and call TConvertingBranchElement::Initialize, but normally the registry class will take care of that).

A few notes:

• The Initialize method will change the New() method of the TBranchElement class to point at our new method. Thus, when we read a TBranchElement from a file, we'll actually make an instance of this class instead. (TBranchElement instances that are created explicitly, for writing, are not affected by this.)
• We make some changes in the contents of the TBranchElement if a conversion is happening. However, the old values are saved, so that when the branch gets written, the original values are restored.

TODO:

• Alternate name in file.
• Emulated persistent class.
• Rewriting the same tree doesn't really work. In the rewritten file, we get the new streamerinfo's for the classes with conversions.

Definition in file TConvertingBranchElement.h.