rsmith added inline comments.
================
Comment at: include/iterator:442
@@ +441,3 @@
+struct __is_exactly_input_iterator
+ : public integral_constant<bool, is_same<typename
iterator_traits<_Tp>::iterator_category, input_iterator_tag>::value> {};
+
----------------
Is it permitted for people to derive their own tag types from
input_iterator_tag and use them here? Perhaps "not (derived from)
forward_iterator_tag" would be more robust?
http://reviews.llvm.org/D15862
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