template <class T> constexpr auto operator==(T lhs, std::nullptr_t) -> stlab::implementation::enable_if_bitmask_or_arithmetic<T, bool> (1) template <class T> constexpr auto operator==(std::nullptr_t, T rhs) -> stlab::implementation::enable_if_bitmask_or_arithmetic<T, bool> (2) (1) template <class T> constexpr auto operator==(T lhs, std::nullptr_t) -> stlab::implementation::enable_if_bitmask_or_arithmetic<T, bool> Parameters T lhs std::nullptr_t unnamed (2) template <class T> constexpr auto operator==(std::nullptr_t, T rhs) -> stlab::implementation::enable_if_bitmask_or_arithmetic<T, bool> MISSING Parameters std::nullptr_t unnamed T rhs