> On Jan 9, 2017, at 11:19 PM, Rien via swift-users <swift-users@swift.org> > wrote: > > It means that a call to that function with an optional will unwrap the > optional before it is used. > > That is quite neat when dealing with C-API’s because often you will receive a > pointer from a C-function which is optional to account for the fact that it > can be NULL (= nil). > By using a forced unwrapped input parameter you are saved the trouble of > unwrapping all these pointers when using them as input for other C-APIs. > > In short, it makes it easier to interface with C-API’s. > > Note that there is some under-the-hood magic going on because a C-pointer is > an unboxed value, while a ‘normal’ optional is a boxed value.
Optionals are never boxed. -Joe _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users
