29 Numerics library [numerics]

29.7 Numeric arrays [numarray]

29.7.8 Class template mask_­array [template.mask.array]

29.7.8.2 mask_­array assignment [mask.array.assign]

void operator=(const valarray<T>&) const; const mask_array& operator=(const mask_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 it refers.