TrigT1CaloCalibConditions: broken fwd decl with clang
Work around an issue where clang in c++20 mode instantiates virtual functions when it doesn't really have to. This in some cases breaks the use of forward-declared classes.
See ATLINFR-5113.
Work around an issue where clang in c++20 mode instantiates virtual functions when it doesn't really have to. This in some cases breaks the use of forward-declared classes.
See ATLINFR-5113.