From 8fda9113b8f568c32790f49559268c00509350fd Mon Sep 17 00:00:00 2001
From: Daniel James <daniel@calamity.org.uk>
Date: Sun, 18 Sep 2016 12:22:48 +0100
Subject: [PATCH] Make 'has_unique_keys' container independent.

---
 test/helpers/metafunctions.hpp | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/test/helpers/metafunctions.hpp b/test/helpers/metafunctions.hpp
index 139fe0a2..8e36549d 100644
--- a/test/helpers/metafunctions.hpp
+++ b/test/helpers/metafunctions.hpp
@@ -8,8 +8,6 @@
 
 #include <boost/config.hpp>
 #include <boost/type_traits/is_same.hpp>
-#include <boost/unordered_set.hpp>
-#include <boost/unordered_map.hpp>
 
 namespace test
 {
@@ -22,19 +20,11 @@ namespace test
     template <class Container>
     struct has_unique_keys
     {
-        BOOST_STATIC_CONSTANT(bool, value = false);
-    };
-
-    template <class V, class H, class P, class A>
-    struct has_unique_keys<boost::unordered_set<V, H, P, A> >
-    {
-        BOOST_STATIC_CONSTANT(bool, value = true);
-    };
-
-    template <class K, class M, class H, class P, class A>
-    struct has_unique_keys<boost::unordered_map<K, M, H, P, A> >
-    {
-        BOOST_STATIC_CONSTANT(bool, value = true);
+        static char flip(BOOST_DEDUCED_TYPENAME Container::iterator const&);
+        static long flip(std::pair<BOOST_DEDUCED_TYPENAME Container::iterator, bool> const&);
+        BOOST_STATIC_CONSTANT(bool, value = sizeof(long) == sizeof(
+                flip(((Container*) 0)->insert(*(BOOST_DEDUCED_TYPENAME Container::value_type*) 0))
+            ));
     };
 }