Add example of ConditionAccessorHolder implementation for integration in Functional
this is an example of implementation of the ConditionAccessorHolder concept LHCb is going to use to migrate the detector description to DD4hep.
While it's not Gaudi specific and experiments are required to provide a specific implementation of it, the example is needed to be able to integrate the functionality in Gaudi::Functional
(as opt in).
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doxygen comments
CC: @graven
Edited by Marco Clemencic