[bitwise.operations.and]

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template<class T = void> struct bit_and {
  constexpr T operator()(const T& x, const T& y) const;
};

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constexpr T operator()(const T& x, const T& y) const;

Returns: x & y.

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template<> struct bit_and<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;
};

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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).

22 General utilities library [utilities]

22.10 Function objects [function.objects]

22.10.11 Bitwise operations [bitwise.operations]

22.10.11.2 Class template bit_and [bitwise.operations.and]