Remove a few IExtrapolator interfaces

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:IExtrapolator_try_to_reduce_interface into master

The IExtrapolator seems to have > 20 interface methods.

  • Quite of few of them are not actually used anywhere
  • A few of the unused ones provide similar signature/functionality as the current Impl methods (Added in MT)
  • But they lack the Cache which was added for MT (to avoid internal state). So they end up creating a cache and just calling the impl
  • This is more header changes rather than .cxx changes , i.e is just unused interfaces (Do not try to really touch the core implementation here)

mentioning @sroe, @amorley , @asalzbur in case it actually turns out that indeed we can remove a few of them ...

Edited by Christos Anastopoulos

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