Hi rooters,
in the dox I found:
from: http://root.cern.ch/root/SchemaEvolution.html
------------------------
How to use the new system
We will distinguish the following cases:
Case A: You have your own Streamer function in your class
implementation
[...]
Case B: You use the automatic streamer in the dictionary file.
Move the old Streamer from the file generated by rootcint to
your class implementation file, then modified the Streamer
function as in case A above.
Increment your class version id in ClassDef by 1, eg.
ClassDef(MyClass, 2)
Add option "-" in the pragma line of LinkDef.
Case C: You use the automatic streamer in the dictionary file and
you
already use the option "+" in the LinkDef file. If the old
automatic Streamer does not contain any statement using the
functions ReadArray, ReadStaticArray, WriteArray,
WriteStaticArray you have nothing to do, except running rootcint
again to regenerate the new form of the Streamer function,
otherwise proceed like for case B.
-------------------------
In our case we have classes with some basic data types (Float_t, Int_t,
etc.) and some fixed size arrays (Float_t[16], ...) without an own
streamer. Someone made a test (with root 3.02/06) and found out: that if
we compile a writing version of the program and a reading one, both
versions once with auto scheme evolution enabled ('+' added in the
LinkDef file) and without it: both readers can read both files without
any further changes. Does this work by chance or did I missunderstood
the stetement above.
Best regards,
Thomas.
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