mixing objective-c and c++

Hello,
I'm trying to write a class in c++ that needs to implement some objective-c methods. I read here, that it's possible: http://www.mactech.com/articles/mactech/Vol.13/13.03/CandObjectiveCCompared/ (at the end of the document)

However, I get this error: 'error: expected unqualified-id before '-' token' at this line
+- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response+

Here's the url_connection.h

#ifndef URL_CONNECTIONH
#define URL_CONNECTIONH

#include "debug.h"

class URL_Connection
{
private:
NSData *receivedData;
NSURL *url;
NSURLRequest *theRequest;
NSURLConnection *theConnection;

public:

URL_Connection();
~URL_Connection();

};

+- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response+
{
// this method is called when the server has determined that it
// has enough information to create the NSURLResponse
// it can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.
// receivedData is declared as a method instance elsewhere
[receivedData setLength:0];
}

#endif


I really have no ideea how to fix this and couldn't find something similar on the web. What am I doing wrong?

Please advice,
Thanks