perform a bit cast from int to string in swift

To perform a bit cast from an Int to a String in Swift, you should first convert the integer to a byte buffer representation and then use the Data type's base64EncodedString() method to obtain the corresponding string:

main.swift
extension Int {
    func toBase64String() -> String? {
        var intVal = self
        let data = Data(bytes: &intVal, count: MemoryLayout.size(ofValue: intVal))
        return data.base64EncodedString()
    }
}

let intValue: Int = 42
let base64String = intValue.toBase64String() // "Kg=="
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The toBase64String() method creates a new Data object from the integer value by specifying the byte buffer value via the & operator and using the MemoryLayout class to obtain the size of the int value in bytes. Then, it returns the base64 representation of that Data object via the base64EncodedString() method.

Please note that this method should not be used to actually encode data or create meaningful string representations of integers. It's purely an example of how to perform a bit cast from an int to a string.