These options control whether an implicitly instantiated template
member function can be selected as a key function. (Normally the
key, or decider, function for a class is its first non-inline virtual
function, in declaration order, that is not pure virtual. However,
in the case of an implicitly instantiated template function, the
function would have vague linkage, that is, might be multiply defined.)
Remark #2819-D is produced when a key function
is implicit. This remark can be seen with --remarks or
with --diag_warning=2819.
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