CODEWITHSUNDEEP
swiftmemorystruct
PGDev
PGDev

Reputation: 24341

Why memory address is not changed for different instances of struct?

Since the structs are value types in Swift, so their memory is ofcourse allocated on the stack.

My question is, why is the memory address not changed when different instances of struct are assigned in the same variable.

Explanation:

For the below struct,

struct Person {
    var name: String

    init(_ name: String) {
        self.name = name
    }
}

if I create the instances of Person like,

var p = Person("John")
withUnsafePointer(to: &p) {
    print("\(p) has address: \($0)") //0x000000010dcea3c0
}
p = Person("Jennifer")
withUnsafePointer(to: &p) {
    print("\(p) has address: \($0)") //0x000000010dcea3c0
}
p = Person("Lisa")
withUnsafePointer(to: &p) {
    print("\(p) has address: \($0)") //0x000000010dcea3c0
}

Why is the same address printed everytime?

Upvotes: 0

Views: 155

Answers (1)

iamMobile
iamMobile

Reputation: 969

This is because you are using same variable. Take this example

var p (This is allocating memory to hold your value)

and now you are just changing the values and not the variable which is already been allocated to a memory location.

Upvotes: 4

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