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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 non-static class member function adapted to a write handler using 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));