PropertyWrappers.swift

@propertyWrapper
struct UpperCased {
    private(set) var value: String = ""
    
    init(wrappedValue initialValue: String) {
        self.wrappedValue = initialValue
    }
    
    var wrappedValue: String {
        get { value }
        set { value = newValue.uppercased() }
    }
}

@propertyWrapper
struct Currency {
    
    private let currencyCode: String
    private(set) var value: String = ""
    
    init(wrappedValue initialValue: String, currencyCode: String) {
        self.currencyCode = currencyCode.uppercased()
        self.wrappedValue = self.currencyCode + " " + initialValue
    }
    
    var wrappedValue: String {
        get { value }
        set { value = newValue }
    }
}

/*
struct CurrencyTest {
    @Currency(currencyCode: "SGD") var totalAmount = "2.0"
    @Currency(currencyCode: "INR") var inrAmount = "100.0"
}

let currencyTest = CurrencyTest(totalAmount: "5.0")
print(currencyTest.totalAmount)
print(currencyTest.inrAmount)

let range = 0.0..<5.0
if range.contains(0.3) {
    print("inside range...")
} else {
    print("outside range...")
}
*/