[core] Add optional type template parameter to util::unit, so that it doesn't always pick up the default type of 'double' from util::mag.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mbgl/util/math.hpp b/src/mbgl/util/math.hpp
index fcde01c1a3..c18ce0c254 100644
--- a/src/mbgl/util/math.hpp
+++ b/src/mbgl/util/math.hpp
@@ -77,9 +77,9 @@ T mag(const S& a) {
     return std::sqrt(a.x * a.x + a.y * a.y);
 }
 
-template <typename S>
+template <typename T = double, typename S>
 S unit(const S& a) {
-    auto magnitude = mag(a);
+    auto magnitude = mag<T>(a);
     if (magnitude == 0) {
         return a;
     }