20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.11 Bitwise operations [bitwise.operations]

20.14.11.3 Class template bit_­or [bitwise.operations.or]

template<class T = void> struct bit_or { constexpr T operator()(const T& x, const T& y) const; };
constexpr T operator()(const T& x, const T& y) const;
Returns: x | y.
template<> struct bit_or<void> { template<class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) | std::forward<U>(u)); using is_transparent = unspecified; };
template<class T, class U> constexpr auto operator()(T&& t, U&& u) const -> decltype(std::forward<T>(t) | std::forward<U>(u));
Returns: std​::​forward<T>(t) | std​::​forward<U>(u).