long primitive NaN value wanted

Scenario: 1) I have a long state variable that can either be set or not set. 2) This long variable has valid values from Long.MIN_VALUE to Long.MAX_VALUE including zero 3) This is performance sensitive code so I don't want to use a Long wrapper type How do I write an 'is set' kind of check for this long? Do I really have to add a second boolean value to test whether the long is valid or not? This seems sloppy. I know I could use a Long wrapper here but this seems like a performance waste to be creating so many objects and checking for null. Pseudo Code (this is sort of what I want): ``` class foo { long someLong = NaN; //NaN = hypothetical not a number like Double public reset() { someLong = NaN; } public doSomethingElse() { if(someLong !=NaN) { //report reset(); } } public doSomeStuff() { if(someLong == NaN) { someLong = //something } } } } ```