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        A legacy completion handler must meet the requirements for a handler.
        A legacy completion handler must meet the requirements of CopyConstructible
        types (C++Std [copyconstructible]). A value h of a completion
        handler class should work correctly in the expression h().
      
A free function as a completion handler:
void completion_handler()
{
  ...
}
A completion handler function object:
struct completion_handler
{
  ...
  void operator()()
  {
    ...
  }
  ...
};
A lambda as a completion handler:
my_io_service.post(
    []()
    {
      ...
    });
        A non-static class member function adapted to a completion handler using
        std::bind():
      
void my_class::completion_handler()
{
  ...
}
...
my_io_service.post(std::bind(&my_class::completion_handler, this));
        A non-static class member function adapted to a completion handler using
        boost::bind():
      
void my_class::completion_handler()
{
  ...
}
...
my_io_service.post(boost::bind(&my_class::completion_handler, this));