[on the Cforall team] It broadly matches our other operator-overloading syntax, where the ?'s show where the arguments go, e.g. ?+? for binary addition, ?++ for

[on the Cforall team] It broadly matches our other operator-overloading syntax, where the ?'s show where the arguments go, e.g. ?+? for binary addition, ?++ for postincrement and ++? for preincrement. For something as common as constructors and destructors, a concise syntax is a desirable feature.