Accept a new connection.

template<
    typename SocketService>
void accept(
    basic_socket< protocol_type, SocketService > & peer);

template<
    typename SocketService>
asio::error_code accept(
    basic_socket< protocol_type, SocketService > & peer,
    asio::error_code & ec);

template<
    typename SocketService>
void accept(
    basic_socket< protocol_type, SocketService > & peer,
    endpoint_type & peer_endpoint);

template<
    typename SocketService>
asio::error_code accept(
    basic_socket< protocol_type, SocketService > & peer,
    endpoint_type & peer_endpoint,
    asio::error_code & ec);