https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111854
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #6) > You are mixing up 2 different things. > First this is about if the operator new is valid and it is because there is > a corresponding placement delete operator (this would be rejected at compile > time). The point is that [expr.new] p28 says it's ill-formed. Yes, there's a corresponding delete operator, but it's one of the "usual deallocation functions", and that isn't an allowed lookup result for a placement new expression. This might seem surprising, but it's what the standard says. > Second is if you can call the normal delete on an allocated memory from that > inplacement new call. The answer is yes you can and not invoke undefined > behavior. That's not what the standard says. 'delete p' will call either operator delete(void*) or operator delete(void*, size_t), and those functions have a precondition that the pointer was obtained from an allocation function without an alignment parameter. See [new.delete.single] p11.
