29 Numerics library [numerics]

29.7 Numeric arrays [numarray]

29.7.5 Class template slice_­array [template.slice.array]

29.7.5.2 slice_­array assignment [slice.arr.assign]

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

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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.