If the containers have equality comparisons, they'll also need 'hash_value'. Untested and undocumented, as before.

[SVN r42108]

test/container/compile_tests.hpp

@@ -129,4 +129,9 @@ void equality_test(X& r, T&)
 
     test::check_return_type<bool>::equals(a == b);
     test::check_return_type<bool>::equals(a != b);
+#if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)
+    test::check_return_type<std::size_t>::equals(boost::hash_value(a));
+#else
+    test::check_return_type<std::size_t>::equals(hash_value(a));
+#endif
 }

test/objects/minimal.hpp

@@ -57,6 +57,10 @@ namespace minimal
         return false;
     }
 
+    std::size_t hash_value(copy_constructible_equality_comparable) {
+        return 1;
+    }
+
     class default_copy_constructible
     {
     public: