Static checks for guidance array sizes.

include/extractor/guidance/turn_instruction.hpp

@@ -16,12 +16,6 @@ namespace extractor
 namespace guidance
 {
 
-namespace detail
-{
-// inclusive bounds for turn modifiers
-const constexpr uint8_t num_direction_modifiers = 8;
-} // detail
-
 // direction modifiers based on angle
 namespace DirectionModifier
 {
@@ -34,6 +28,7 @@ const constexpr Enum Straight = 4;
 const constexpr Enum SlightLeft = 5;
 const constexpr Enum Left = 6;
 const constexpr Enum SharpLeft = 7;
+const constexpr Enum MaxDirectionModifier = 8;
 }
 
 namespace TurnType
@@ -70,6 +65,7 @@ const constexpr Enum ExitRoundaboutIntersection = 24; // Exiting a small Roundab
 const constexpr Enum StayOnRoundabout = 25; // Continue on Either a small or a large Roundabout
 const constexpr Enum Sliproad =
     26; // Something that looks like a ramp, but is actually just a small sliproad
+const constexpr Enum MaxTurnType = 27; // Special value for static asserts
 }
 
 // turn angle in 1.40625 degree -> 128 == 180 degree