//Create a connection and set a target URL.	
auto connection = std::make_shared<curlion::Connection>();
connection->SetUrl("http://www.qq.com");

//Start the connection, this call would not return until it is finished.
connection->Start();

//Get result code. 
auto result = connection->GetResult();

//Get response body.
auto response_body = connection->GetResponseBody();

class MyTimer : public curlion::Timer {
public:    
    void Start(long timeout_ms, const std::function<void()>& callback) override {
        //Start a timer which expires in timeout_ms, then call callback to notify curlion.
    }	

    void Stop() override {
        //Stop the timer which starts in Start method.
    }
};

class MySocketWatcher : public curlion::SocketWatcher {
public:
    void Watch(curl_socket_t socket, Event event, const EventCallback& callback) override {
        //Start a monitor to watch the socket on event. 
        //When the event is triggered, call callback to notify curlion.
    }

    void StopWatching(curl_socket_t socket) override {
        //Stop the monitor which starts in Watch method.
    }
};

class MySocketFactory : public curlion::SocketFactory {
public:
    curl_socket_t Open(curlsocktype socket_type, const curl_sockaddr* address) override {
        //Open a socket with specified type and address.
    }

    bool Close(curl_socket_t socket) override {
        //Close the specified socket.
    }
};

auto timer = std::make_shared<MyTimer>();
auto socket_watcher = std::make_shared<MySocketWatcher>();
auto socket_factory = std::make_shared<MySocketFactory>();

curlion::ConnectionManager connection_manager(socket_factory, socket_watcher, timer);

auto connection = std::make_shared<curlion::Connection>();
connection->SetUrl("http://www.qq.com");

connection->SetFinishedCallback([](const std::shared_ptr<Connection>& connection) {

    //Get result code. 
    auto result = connection->GetResult();

    //Get response body.
    auto response_body = connection->GetResponseBody();
});

connection_manager.StartConnection(connection);