fixed -=, +=, *=, /= operators in QuantityVector.hpp and .inl (please check if...

fixed -=, +=, *=, /= operators in QuantityVector.hpp and .inl (please check if this modification is really needed)

corsika/detail/framework/geometry/QuantityVector.inl

@@ -102,26 +102,26 @@ namespace corsika {
   }
 
   template <typename TDimension>
-  inline auto& QuantityVector<TDimension>::operator/=(double const p) {
+  inline auto QuantityVector<TDimension>::operator/=(double const p) {
     eigenVector_ /= p;
     return *this;
   }
 
   template <typename TDimension>
-  inline auto& QuantityVector<TDimension>::operator*=(double const p) {
+  inline auto QuantityVector<TDimension>::operator*=(double const p) {
     eigenVector_ *= p;
     return *this;
   }
 
   template <typename TDimension>
-  inline auto& QuantityVector<TDimension>::operator+=(
+  inline auto QuantityVector<TDimension>::operator+=(
       QuantityVector<TDimension> const& pQVec) {
     eigenVector_ += pQVec.eigenVector_;
     return *this;
   }
 
   template <typename TDimension>
-  inline auto& QuantityVector<TDimension>::operator-=(
+  inline auto QuantityVector<TDimension>::operator-=(
       QuantityVector<TDimension> const& pQVec) {
     eigenVector_ -= pQVec.eigenVector_;
     return *this;

corsika/framework/geometry/QuantityVector.hpp

@@ -81,11 +81,11 @@ namespace corsika {
 
     auto operator/(double const p) const;
 
-    auto& operator/=(double const p);
+    auto operator/=(double const p);
 
-    auto& operator*=(double const p);
+    auto operator*=(double const p);
 
-    auto& operator+=(QuantityVector<TDimension> const& pQVec);
+    auto operator+=(QuantityVector<TDimension> const& pQVec);
 
     auto& operator-=(QuantityVector<TDimension> const& pQVec);