28 Numerics library [numerics]

28.6 Numeric arrays [numarray]

28.6.9 Class template indirect_array [template.indirect.array]

28.6.9.3 Compound assignment [indirect.array.comp.assign]

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void operator*= (const valarray<T>&) const; void operator/= (const valarray<T>&) const; void operator%= (const valarray<T>&) const; void operator+= (const valarray<T>&) const; void operator-= (const valarray<T>&) const; void operator^= (const valarray<T>&) const; void operator&= (const valarray<T>&) const; void operator|= (const valarray<T>&) const; void operator<<=(const valarray<T>&) const; void operator>>=(const valarray<T>&) const;
1
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These compound assignments have reference semantics, applying the indicated operation to the elements of the argument array and selected elements of the valarray<T> object to which the indirect_array object refers.
2
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If the indirect_array specifies an element in the valarray<T> object to which it refers more than once, the behavior is undefined.