Don't forget your implicit casts

I recently answered a question on the apple forums regarding an error that arose from passing an NSDictionary object to a function that requires a CFDictionaryRef, although apple states that they are a toll free bridge to eachother, you still need to implicitly cast them.

example:

NSDictionary * someNSDictionary = [[NSDictionary alloc]initWithContentsOfFile:@"/SomePath"];

CFDictionaryRef someCFDictionary = (CFDictionaryRef)someNSDictionary;