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