D-Summer-School

Template Constraints Quiz

Question

When doesn’t returnIfPrimeParam(25) compile?

	Because 25 is not prime	While 25 is indeed not prime, this is not the reason the function coll does not compile. `returnIfPrimeParam(17)` doesn’t compile either and 17 is prime. The reason is that because 25 is a parameter and not a template argument, its value isn’t known at compile time.
	Because the parameter value is not known at compile time	Correct!
	Because `isPrime` is not a template function	While 25 is indeed not prime, this is not the reason the function coll does not compile. `returnIfPrimeParam(17)` doesn’t compile either and 17 is prime. The reason is that because 25 is a parameter and not a template argument, its value isn’t known at compile time.
	Because its template paremeter is not explicitly specified	While 25 is indeed not prime, this is not the reason the function coll does not compile. `returnIfPrimeParam(17)` doesn’t compile either and 17 is prime. The reason is that because 25 is a parameter and not a template argument, its value isn’t known at compile time.