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Instantiating the __deduce_funcref function body for function pointers without arguments or member pointers with non-matching object types previously led to hard errors due to the formation of invalid types. The __deduce_funcref function is now adjusted to return void in such cases. The corresponding function_ref deduction guide is constrained to only match if the return type is not void, making it SFINAE friendly. PR libstdc++/121940 libstdc++-v3/ChangeLog: * include/bits/funcwrap.h (__polyfunc::__deduce_funcref): Return void for ill-formed constructs. (function_ref(nontype_t<__f>, _Tp&&)): Constrain on __deduce_funcref producing non-void results. * testsuite/20_util/function_ref/deduction.cc: Negative tests. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>
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