# TObject

## TObject.txt

```
// Here is the format of the DATA for a TObject object in Release 3.02.06.
//--------
//  0->1  Version   = Version of TObject Class
//  2->5  fUniqueID = Unique ID of object.  Currently, unless this object is or was
//                       | referenced by a TRef or TRefArray, or is itself a TRef or TRefArray,
//                       | this field is not used by ROOT.
//  6->9  fBits     = A 32 bit mask containing status bits for the object.
//                       | The bits relevant to ROOTIO are:
//                       | 0x00000001 - if object in a list can be deleted.
//                       | 0x00000008 - if other objects may need to be deleted when this one is.
//                       | 0x00000010 - if object is referenced by pointer to persistent object.
//                       | 0x00002000 - if object ctor succeeded but object shouldn't be used
//                       | 0x01000000 - if object is on Heap.
//                       | 0x02000000 - if object has not been deleted.
// The "pidf" field below is present only if this TObject object (or an object inheriting
//      from it) is referenced by a pointer to persistent object.
// 10->11 pidf  = An identifier of the TProcessID record for the process that wrote the
//                       | object. This identifier is an unsigned short.  The relevant record
//                       | has a name that is the string "ProcessID" concatenated with the ASCII
//                       | decimal representation of "pidf" (no leading zeros).  0 is a valid pidf.
//-------
// No object in the StreamerInfo record will be a reference or referenced, and all objects
//      are on the heap.  So, for each occurrence in the StreamerInfo record, fUniqueID will be 0,
//      fBits will be 0x03000000, and pidf will be absent.
```