fix a const error in IndexSetIter::operator+() #94

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merged 1 commit into from Apr 8, 2016
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@@ -507,7 +507,7 @@ operator-(const IndexSetIter<T>& x, const IndexSetIter<T>& y)
template <typename T>
IndexSetIter<T>
-operator+(const IndexSetIter<T>& x, typename IndexSetIter<T>::difference_type d)
+operator+(IndexSetIter<T>& x, typename IndexSetIter<T>::difference_type d)
{
return x += d;
}