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swiftstructruntime
Giuseppe Roberto Rossi
Giuseppe Roberto Rossi

Reputation: 796

Swift Struct: adding new parameters at runtime

Given an instance of struct like this: 

struct Size {
    var width: Int
    var height: Int
}

Is there the possibility to extend it by runtime to: 

struct Size {
    var width: Int
    var height: Int
    var depth: Int
}

adding a new parameter to the existing instance of Size struct ?

Thanks

Upvotes: 1

Views: 1851

Answers (2)

Robert Dresler
Robert Dresler

Reputation: 11200

This is Swift. You should know about properites of your object when you're creating it.

You have to options:

  • Make depth property optional. Then this property doesn't have to have any value

    var depth: Int?

  • Or give it default value

    var depth: Int = 1

    With this second option you can create custom init with default value

    struct Size {
    var width, height, depth: Int
}

extension Size {
    init(width: Int, height: Int) {
        self.init(width: width, height: height, depth: 1)
    }
}

Size(width: 1, height: 1)
Size(width: 1, height: 1, depth: 1)

Upvotes: 0

Mohmmad S
Mohmmad S

Reputation: 5088

No, there is no way adding that but what you can do is the following, You can declare everything that you might need at run time as an optional, plus if however you were able to add new properties to the struct at run time what is the use of it ? how are you going to use them ?.

Simply optional the values.

struct Size {
 var width: Int
 var height: Int
 var depth: Int? // this could be nil or Int 
}

Upvotes: 1

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