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Telegram/ThirdParty/range-v3/test/bug1633.cpp

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+// Range v3 library
+//
+//  Use, modification and distribution is subject to the
+//  Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// Project home: https://github.com/ericniebler/range-v3
+
+#include <cstddef>
+#include <iterator>
+#include <range/v3/iterator.hpp>
+
+struct X { };
+
+namespace std {
+    template<> struct iterator_traits<X> { };
+}
+
+struct Y {
+    using difference_type = std::ptrdiff_t;
+    using value_type = int;
+    using pointer = int*;
+    using reference = int&;
+    using iterator_category = std::forward_iterator_tag;
+};
+
+static_assert(ranges::detail::is_std_iterator_traits_specialized_v<X>, "");
+static_assert(!ranges::detail::is_std_iterator_traits_specialized_v<Y>, "");
+static_assert(!ranges::detail::is_std_iterator_traits_specialized_v<int*>, "");
+
+int main()
+{
+}