Method value

3rd/asio-1.24.0/include/asio/execution/blocking.hpp:943–946

       //   && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)

  static ASIO_CONSTEXPR blocking_t<I> value()
  {
    return never_t();
  }

  friend ASIO_CONSTEXPR bool operator==(
      const never_t&, const never_t&)