copymask(d.elem(),mask.elem(),s1.elem());
copymask(d.real(),mask.elem(),s1.real()); copymask(d.imag(),mask.elem(),s1.imag());
void copymask(RScalar<T>& d, const RScalar<T1>& mask, const RScalar<T>& s1) {  copymask(d.elem(),mask.elem(),s1.elem());}