std::function vs function pointer (was ::Non-portable: Converting a function pointer to an object pointer type or vice versa is conditionally-supported)

[aka-sps]

INTERNATIONAL STANDARD ISO/IEC14882:2011(E) Third edition 2011-09-01

5.2.10 Reinterpret cast [expr.reinterpret.cast]

8 Converting a function pointer to an object pointer type or vice versa is conditionally-supported. The meaning of such a conversion is implementation-defined, except that if an implementation supports conversions in both directions, converting a prvalue of one type to the other type and back, possibly with different cv-qualification, shall yield the original pointer value.

[r35382]

Currently 'void*' variable is used for user`s callback storage. So, the above report is not exactly an issue.
However, usege of function pointers instead of modern std::function approach is the topic for discussions