ObjectiveC Syntax for Specifying Protocol Name in Method Argument

What's the ObjectiveC syntax for specifying a protocol as an argument in a method?

Say I have 2 protocols, MyProtocol and MyProtocolCB:

@protocol MyProtocolCB <NSObject>
- (void) func;
@end

@protocol MyProtocol <NSObject>
- (void) register:(MyProtocolCB*) cb;
@end

I'm receiving this syntax error: error: expected type-specifier before 'MyProtocolCB'

objective-c cocoa

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