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        A value h of a cancellation handler class should work correctly
        in the expression h(t), where t is a value of type
        boost::asio::cancellation_type.
      
A free function as a cancellation handler:
void cancellation_handler(
    boost::asio::cancellation_type type)
{
  ...
}
slot.assign(cancellation_handler);
A cancellation handler function object:
struct cancellation_handler
{
  ...
  void operator()(
      boost::asio::cancellation_type type)
  {
    ...
  }
  ...
};
cancellation_handler& h = slot.assign(cancellation_handler{ ... });
A lambda as a cancellation handler:
auto& h = slot.assign(
    [](boost::asio::cancellation_type type)
    {
      ...
    });