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        An accept handler must meet the requirements for a handler.
        A value h of an accept handler class should work correctly in
        the expression h(ec), where ec is an lvalue of
        type const error_code.
      
A free function as an accept handler:
void accept_handler(
    const boost::system::error_code& ec)
{
  ...
}
An accept handler function object:
struct accept_handler
{
  ...
  void operator()(
      const boost::system::error_code& ec)
  {
    ...
  }
  ...
};
A lambda as an accept handler:
acceptor.async_accept(...,
    [](const boost::system::error_code& ec)
    {
      ...
    });
        A non-static class member function adapted to an accept handler using std::bind():
      
void my_class::accept_handler(
    const boost::system::error_code& ec)
{
  ...
}
...
acceptor.async_accept(...,
    std::bind(&my_class::accept_handler,
      this, std::placeholders::_1));
        A non-static class member function adapted to an accept handler using boost::bind():
      
void my_class::accept_handler(
    const boost::system::error_code& ec)
{
  ...
}
...
acceptor.async_accept(...,
    boost::bind(&my_class::accept_handler,
      this, boost::asio::placeholders::error));