X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fmath%2FSGVec4.hxx;h=4339dfd9b79879a3fab0da2b59a5cca747cc5578;hb=584ee1364f25e5c3795f9ff4633a792cba39bfc7;hp=6e42d957d8710f9a3a56c85cfa9d0b3ddf41f0bd;hpb=2cc5e776b335e2d18573270bbe9ded1f834ea3d1;p=simgear.git

diff --git a/simgear/math/SGVec4.hxx b/simgear/math/SGVec4.hxx
index 6e42d957..4339dfd9 100644
--- a/simgear/math/SGVec4.hxx
+++ b/simgear/math/SGVec4.hxx
@@ -18,6 +18,8 @@
 #ifndef SGVec4_H
 #define SGVec4_H
 
+#include <iosfwd>
+
 /// 4D Vector Class
 template<typename T>
 class SGVec4 {
@@ -242,6 +244,19 @@ max(S s, const SGVec4<T>& v)
                    SGMisc<T>::max(s, v(3)));
 }
 
+/// Add two vectors taking care of (integer) overflows. The values are limited
+/// to the respective minimum and maximum values.
+template<class T>
+SGVec4<T> addClipOverflow(SGVec4<T> const& lhs, SGVec4<T> const& rhs)
+{
+  return SGVec4<T>(
+    SGMisc<T>::addClipOverflow(lhs.x(), rhs.x()),
+    SGMisc<T>::addClipOverflow(lhs.y(), rhs.y()),
+    SGMisc<T>::addClipOverflow(lhs.z(), rhs.z()),
+    SGMisc<T>::addClipOverflow(lhs.w(), rhs.w())
+  );
+}
+
 /// Scalar dot product
 template<typename T>
 inline