Project

General

Profile

Actions
Copy link

Feature #276

closed

Pointer to extension structure

Added by Ole Hansen over 6 years ago. Updated over 6 years ago.

Status:
Closed
Priority:
Normal
Assignee:
-
Target version:
1.6
Start date:
03/07/2018
Due date:
% Done:

100%

Estimated time:
2.00 h
Spent time:
1.00 h
Responsible:

Description

To help with maintaining binary compatibility for future patch releases of a given main release, add a pointer to an extension data structure to THaAnalysisObject. By default, this is a null pointer. If a bug fix or new feature in a certain class requires new data members (something which happens rather often), its constructor would allocate a structure containing those data members. They would be accessed like

MyDetectorExtraData* ex = static_cast<MyDetectorExtraData*>(fExtra);
if( ex->fSomeData > 0 )
  // do something

The fExtra pointer should be to some kind of "extra data" base class that offers a minimal common API, e.g. to find out the stucture's size, stream the info etc. Maybe it is easiest to let the base class just be TObject.

Actions
Copy link

Also available in: Atom PDF