Set a variable to the < (“less than”) operator as a function in Swift?

Question

There\'s a neat guide here about overloading operators in Swift, but it doesn\'t say anything about treating operators as functions that I can pass around as variables like

Answer 1

If you give comparator an explicit type, then it will work.

var comparator: (Int, Int) -> Bool = (<)

or

var comparator: (Double, Double) -> Bool = (<)

Less than < isn't a single function, but a whole collection of them for different types. By identifying the type you are interested in comparing, you allow the compiler to select the correct less than function.