Function Nullary

cpp/src/arrow/compute/function.h:47–47

\brief A function taking no arguments

struct ARROW_EXPORT Arity {
  /// \brief A function taking no arguments
  static Arity Nullary() { return Arity(0, false); }

  /// \brief A function taking 1 argument
  static Arity Unary() { return Arity(1, false); }