CODEWITHSUNDEEP
iosswiftgenerics
Ihor M.
Ihor M.

Reputation: 302

Class func for create subclass objects in Swift

I have Animal class with "class func create()" :

class func create<T>() -> T {
    let animal = Animal() as! T
    return animal
}

and I have subclass Dog:

class Dog: Animal { }

I use create() for creating subclass objects:

let doggy: Dog = Dog.create()

But if I create doggy this way: 

let doggy = Dog.create()

I have error "Generic parameter 'T' could not be inferred" How can I setup dynamic type inferred based on caller type?

Upvotes: 0

Views: 81

Answers (1)

zgorawski
zgorawski

Reputation: 2727

this line:

let doggy = Dog.create()

declares a constant, without explicitly naming its type, yet, create function requires it. Try:

let doggy: Dog = Dog.create()

Upvotes: 0

Related Questions