From b311fcefb2478bbe3aea776f9686c188bd053fa9 Mon Sep 17 00:00:00 2001
From: Niels Dekker <nielsdekker@xs4all.nl>
Date: Fri, 25 Jul 2008 18:48:09 +0000
Subject: [PATCH] Added test_adl_barrier to swap/test, as discussed with Joseph
 Gauterin.

[SVN r47808]
---
 swap/test/Jamfile.v2           |  5 ++---
 swap/test/test_adl_barrier.cpp | 36 ++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 3 deletions(-)
 create mode 100644 swap/test/test_adl_barrier.cpp

diff --git a/swap/test/Jamfile.v2 b/swap/test/Jamfile.v2
index a13cbd0..d648de2 100644
--- a/swap/test/Jamfile.v2
+++ b/swap/test/Jamfile.v2
@@ -20,7 +20,6 @@ test-suite utility/swap
     [ run specialized_in_global.cpp ../../../test/build//boost_test_exec_monitor/<link>static ]
     [ run specialized_in_other.cpp ../../../test/build//boost_test_exec_monitor/<link>static  ]
     [ run specialized_in_std.cpp ../../../test/build//boost_test_exec_monitor/<link>static    ]
-    [ run swap_arrays.cpp ../../../test/build//boost_test_exec_monitor/<link>static    ]
+    [ run test_adl_barrier.cpp ../../../test/build//boost_test_exec_monitor/<link>static      ]
+    [ run swap_arrays.cpp ../../../test/build//boost_test_exec_monitor/<link>static           ]
     ;
-
-
diff --git a/swap/test/test_adl_barrier.cpp b/swap/test/test_adl_barrier.cpp
new file mode 100644
index 0000000..e30a1b6
--- /dev/null
+++ b/swap/test/test_adl_barrier.cpp
@@ -0,0 +1,36 @@
+// Copyright (c) 2008 Joseph Gauterin, Niels Dekker
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// boost::swap internally does an unqualified function call to swap.
+// This could have led to ambiguity or infinite recursion, when the
+// objects to be swapped would themselves be from the boost namespace.
+// If so, boost::swap itself might be found by argument dependent lookup
+// (ADL). The implementation of boost::swap resolves this issue by
+// using a barrier namespace. The following test checks this "ADL barrier".
+
+#include <boost/utility/swap.hpp>
+#define BOOST_INCLUDE_MAIN
+#include <boost/test/test_tools.hpp>
+
+//Put test class in namespace boost
+namespace boost
+{
+  #include "./swap_test_class.hpp"
+}
+
+
+int test_main(int, char*[])
+{
+  boost::swap_test_class object1;
+  boost::swap_test_class object2;
+  boost::swap(object1,object2);
+
+  BOOST_CHECK_EQUAL(boost::swap_test_class::swap_count(),0);
+  BOOST_CHECK_EQUAL(boost::swap_test_class::copy_count(),3);
+
+  return 0;
+}
+