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        A write handler must meet the requirements for a handler.
        A value h of a write handler class should work correctly in
        the expression h(ec, s), where ec is an lvalue
        of type const error_code and s is an lvalue of
        type const size_t.
      
A free function as a write handler:
void write_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
A write handler function object:
struct write_handler
{
  ...
  void operator()(
      const boost::system::error_code& ec,
      std::size_t bytes_transferred)
  {
    ...
  }
  ...
};
A lambda as a write handler:
socket.async_write(...
    [](const boost::system::error_code& ec,
      std::size_t bytes_transferred)
    {
      ...
    });
        A non-static class member function adapted to a write handler using std::bind():
      
void my_class::write_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
...
socket.async_write(...,
    std::bind(&my_class::write_handler,
      this, std::placeholders::_1,
      std::placeholders::_2));
        A non-static class member function adapted to a write handler using boost::bind():
      
void my_class::write_handler(
    const boost::system::error_code& ec,
    std::size_t bytes_transferred)
{
  ...
}
...
socket.async_write(...,
    boost::bind(&my_class::write_handler,
      this, boost::asio::placeholders::error,
      boost::asio::placeholders::bytes_transferred));