1 files changed, 93 insertions, 0 deletions
diff --git a/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
new file mode 100644
index 000000000000..803ecb5adfcb
--- /dev/null
+++ b/test/std/containers/unord/unord.map/unord.map.modifiers/erase_const_iter.pass.cpp
@@ -0,0 +1,93 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <unordered_map>
+
+// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
+//           class Alloc = allocator<pair<const Key, T>>>
+// class unordered_map
+
+// iterator erase(const_iterator p)
+
+#include <unordered_map>
+#include <string>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+struct TemplateConstructor
+{
+    template<typename T>
+    TemplateConstructor (const T&) {}
+};
+
+bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
+struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
+
+int main()
+{
+    {
+        typedef std::unordered_map<int, std::string> C;
+        typedef std::pair<int, std::string> P;
+        P a[] =
+        {
+            P(1, "one"),
+            P(2, "two"),
+            P(3, "three"),
+            P(4, "four"),
+            P(1, "four"),
+            P(2, "four"),
+        };
+        C c(a, a + sizeof(a)/sizeof(a[0]));
+        C::const_iterator i = c.find(2);
+        c.erase(i);
+        assert(c.size() == 3);
+        assert(c.at(1) == "one");
+        assert(c.at(3) == "three");
+        assert(c.at(4) == "four");
+    }
+#if TEST_STD_VER >= 11
+    {
+        typedef std::unordered_map<int, std::string, std::hash<int>, std::equal_to<int>,
+                            min_allocator<std::pair<const int, std::string>>> C;
+        typedef std::pair<int, std::string> P;
+        P a[] =
+        {
+            P(1, "one"),
+            P(2, "two"),
+            P(3, "three"),
+            P(4, "four"),
+            P(1, "four"),
+            P(2, "four"),
+        };
+        C c(a, a + sizeof(a)/sizeof(a[0]));
+        C::const_iterator i = c.find(2);
+        c.erase(i);
+        assert(c.size() == 3);
+        assert(c.at(1) == "one");
+        assert(c.at(3) == "three");
+        assert(c.at(4) == "four");
+    }
+#endif
+#if TEST_STD_VER >= 14
+    {
+    //  This is LWG #2059
+        typedef TemplateConstructor T;
+        typedef std::unordered_map<T, int, Hash> C;
+        typedef C::iterator I;
+
+        C m;
+        T a{0};
+        I it = m.find(a);
+        if (it != m.end())
+            m.erase(it);
+    }
+#endif
+}