void operator=(const valarray<T>&) const; const indirect_array& operator=(const indirect_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 it refers.
If the indirect_array specifies an element in the valarray<T> object to which it refers more than once, the behavior is undefined.
[ Example:
int addr[] = {2, 3, 1, 4, 4};
valarray<size_t> indirect(addr, 5);
valarray<double> a(0., 10), b(1., 5);
a[indirect] = b;
results in undefined behavior since element 4 is specified twice in the indirection. — end example ]
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