Implement NULL iterators for <forward_list> and <deque> re: N3644

llvm-svn: 187805

1 files changed, 19 insertions, 0 deletions

diff --git a/libcxx/test/containers/sequences/deque/iterators.pass.cpp b/libcxx/test/containers/sequences/deque/iterators.pass.cpp
index ee5e96e8f9a..5645b5d9499 100644
--- a/libcxx/test/containers/sequences/deque/iterators.pass.cpp
+++ b/libcxx/test/containers/sequences/deque/iterators.pass.cpp
@@ -44,4 +44,23 @@ int main()
     assert(i == j);
     }
 #endif
+#if _LIBCPP_STD_VER > 11
+    { // N3664 testing
+        std::deque<int>::iterator ii1{}, ii2{};
+        std::deque<int>::iterator ii4 = ii1;
+        std::deque<int>::const_iterator cii{};
+        assert ( ii1 == ii2 );
+        assert ( ii1 == ii4 );
+        assert ( ii1 == cii );
+
+        assert ( !(ii1 != ii2 ));
+        assert ( !(ii1 != cii ));
+
+//         std::deque<int> c;
+//         assert ( ii1 != c.cbegin());
+//         assert ( cii != c.begin());
+//         assert ( cii != c.cend());
+//         assert ( ii1 != c.end());
+    }
+#endif
 }