Add compile-time checks w.r.t. is_primary or existance of get_secondary_event()
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is_primary or existance of get_secondary_event()
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That is not a polished commit, but rather just a draft showing that some more compile-time checking of the interfaces is possible without any restructuring. (Cf. discussion in PR #2988).
IS_PRIMARYproperty, we now can dropConnection::get_secondary_event(), which could only be reached by illegal code.not IS_PRIMARYand the existence of the derived Connection'sget_secondary_event— and it provides a compile-time error message in cases where this isn't the case.