https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78420
--- Comment #17 from Ville Voutilainen <ville.voutilainen at gmail dot com> --- (In reply to Jens Maurer from comment #16) > I'd like to point out that there is no prohibition against writing > reinterpret_cast inside a constexpr function. It's just if you call that > function and actually evaluate the reinterpret_cast does the expression turn > into an expression that is not a constant expression. In this case, it violates [dcl.constexpr]/5, so the function definition would be ill-formed NDR.
