add LengthSqr

2019-03-18 17:40:08 +08:00 · 2019-03-18 17:40:08 +08:00 · 1eaf2da087
commit 1eaf2da087
parent 128aab9252
1 changed files with 6 additions and 0 deletions
--- a/a8/sysutils.h
+++ b/a8/sysutils.h
@ -48,6 +48,12 @@ namespace a8
        return v < hi ? (v > lo ? v : lo) : hi;
    }

+    template <typename T>
+    const T& LengthSqr(const T& v)
+    {
+        return v.x * v.x + v.y * v.y;
+    }
+
    template <typename T>
    void SetToVector(std::set<T>& set_v, std::vector<T>& vector_v)
    {