INFINITY in Swift Lang

Question

According to Apple's documentation, Swift doesn't support preprocessor directives. In C/Objective-c the "INFINITY" definition is very useful for some checks. So, How do I get a number that never is less that another?

Answer 1

There is already buildin infinity and also a check function. And you could also directly compare them with <.

var infinity = Double.infinity var isInfinite = infinity.isInfinite var someDouble = 234432.0 if someDouble < infinity {     println("Less than") } else {     println("Small than") } // And the answer is Less than. 

Answer 2

For integer values, you should use Int.max.

var highestNumber = Int.max  //if you need negative infinity var lowestNumber = Int.min 

Using NSIntegerMax instead of Int.max or -1 * NSIntegerMax instead of Int.min is equivalent, but less pretty. (Thanks @Charlesism)