if operator-() can change the type we have to use static_cast to get the correct type back
if operator-() can change the type we have to use static_cast to get the correct type back

VcDevel/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,chr-engwer/Vc,VcDevel/Vc,chr-engwer/Vc