In scansion, a vowel is long by position if there are more than two or more consonants between it and the next vowel. Can a vowel be long by position if it ends a line and there is no next vowel? E.g. is the "E" in "REX" long if it is the last syllable in a line? I am particularly concerned with the case for dactylic hexameter if it makes a difference for the answer to the question.