coord: add product function

2018-04-17 17:01:53 +10:00 · 2018-04-17 17:01:53 +10:00 · e0f0e3b19b
commit e0f0e3b19b
parent 1678cb3a69
1 changed files with 15 additions and 0 deletions
--- a/coord/ops.hpp
+++ b/coord/ops.hpp
@ -1098,6 +1098,21 @@ namespace util {
    }


+    //-------------------------------------------------------------------------
+    template <
+        typename K,
+        typename = std::enable_if_t<is_coord_v<K>>
+    >
+    auto
+    product (K const& k)
+    {
+        typename K::value_type accum = 1;
+        for (auto i: k)
+            accum *= i;
+        return accum;
+    }
+
+
    ///////////////////////////////////////////////////////////////////////////
 #define VECTOR_OP(OP)                                   \
    template <                                          \