Fix for LWG Issue 2059: C++0x ambiguity problem with map::erase

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@236950 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 23 insertions, 0 deletions

diff --git a/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp b/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
index 6a005d3e3..d3be2b6d6 100644
--- a/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
+++ b/test/std/containers/unord/unord.multiset/erase_const_iter.pass.cpp
@@ -20,6 +20,15 @@
 
 #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()
 {
     {
@@ -67,4 +76,18 @@ int main()
         assert(c.count(4) == 1);
     }
 #endif
+#if __cplusplus >= 201402L
+    {
+    //  This is LWG #2059
+        typedef TemplateConstructor T;
+        typedef std::unordered_set<T, Hash> C;
+        typedef C::iterator I;
+
+        C m;
+        T a{0};
+        I it = m.find(a);
+        if (it != m.end())
+            m.erase(it);
+    }
+#endif
 }