TBuffer question

ROOT
1

I have a streamer that reads with TMyClass::Class()->ReadBuffer(R__b,this)I would like to know what the class version I am reading is. If I useVersion_t R__v = R__b.ReadVersion(&R__s, &R__c)before calliong ReadBuffer() - it advances the buffer position. How do I backup? Or is there another way to get the class version I’m currently reading? Thanks.
I am using 5.06/00 and am reading root files created with root version streaching back to 3.02. Thanks.
Ed Oltman

2

Hi Ed,

When calling this incarnation of ReadVersion, you must also call the other incarnation of ReadBuffer, eg:

UInt_t R__s, R__c; Version_t R__v = R__b.ReadVersion(&R__s, &R__c); if (R__v > 5) { TAxis::Class()->ReadBuffer(R__b, this, R__v, R__s, R__c); return; }

Rene

3

Thanks Rene - that does it.
Ed