26 Numerics library [numerics]

26.7 Numeric arrays [numarray]

26.7.5 Class template slice_array [template.slice.array]

26.7.5.2 slice_array assignment [slice.arr.assign]

void operator=(const valarray<T>&) const; const slice_array& operator=(const slice_array&) const;

These assignment operators have reference semantics, assigning the values of the argument array elements to selected elements of the valarray<T> object to which the slice_array object refers.