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 asio::error_code& ec, std::size_t bytes_transferred) { ... }
A write handler function object:
struct write_handler { ... void operator()( const asio::error_code& ec, std::size_t bytes_transferred) { ... } ... };
A lambda as a write handler:
socket.async_write(... [](const asio::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 asio::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 asio::error_code& ec, std::size_t bytes_transferred) { ... } ... socket.async_write(..., boost::bind(&my_class::write_handler, this, asio::placeholders::error, asio::placeholders::bytes_transferred));