23 General utilities library [utilities]

23.7 Variants [variant]

23.7.10 Specialized algorithms [variant.specalg]

template <class... Types> void swap(variant<Types...>& v, variant<Types...>& w) noexcept(see below);

Effects: Equivalent to v.swap(w).

Remarks: This function shall not participate in overload resolution unless is_­move_­constructible_­v<> && is_­swappable_­v<> is true for all i. The expression inside noexcept is equivalent to noexcept(v.swap(w)).