CODEWITHSUNDEEP
genericsswiftprotocols
Aleksey G.
Aleksey G.

Reputation: 181

Segmentation fault with swift generics

This is really confusing me and I'm tired looking for workaround to make it work, may be anyone else faced this issue?

Welcome to Swift!  Type :help for assistance.
  1> protocol Type {}
  2> class Expression<T: Type> {}
  3> var exp: Expression<Type>? = nil
exp: Expression<Type>? = nil
  4> class A { 
  5.     var exp: Expression<Type>? = nil 
  6. }    
Segmentation fault: 11

Somehow third line works only in repl, but doesn't work in playground

Upvotes: 0

Views: 579

Answers (2)

fluidsonic
fluidsonic

Reputation: 4676

Xcode 6.1 GM 2 fixed a lot of the compiler crashes.

If you have to rely on an older Xcode version then there is no other way than changing your code's structure until it compiles successfully without crashes.

Upvotes: 0

Ray Perea
Ray Perea

Reputation: 5851

I have the same issue. I did get it to work.... But at a cost.

You have to make the protocol an objective c protocol by prepending @objc

Try this code:

@objc protocol Type {}
class Expression<T: Type> {}
var exp: Expression<Type>? = nil

class A {
    var exp: Expression<Type>? = nil
}

Upvotes: 2

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