coord: add generic dot function

2014-12-15 13:30:02 +11:00 · 2014-12-15 13:30:02 +11:00 · c3cd865c16
commit c3cd865c16
parent 29c2457549
1 changed files with 9 additions and 0 deletions
--- a/detail/coord.hpp
+++ b/detail/coord.hpp
@ -110,6 +110,15 @@ namespace util {
            double  operator[] (size_t i) const { return data[i]; }
        };

+        template <size_t S>
+        double dot (const coord_data<S> &a, const coord_data<S> &b)
+        {
+            double sum = 0;
+            for (size_t i = 0; i < S; ++i)
+                sum += a.data[i] * b.data[i];
+            return sum;
+        }
+
        template <>
        struct coord_data<4> {
            union {