diff --git a/libs/functional/hash/examples/portable.cpp b/libs/functional/hash/examples/portable.cpp
new file mode 100644
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+++ b/libs/functional/hash/examples/portable.cpp
@@ -0,0 +1,54 @@
+
+// Copyright 2005-2009 Daniel James.
+// 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)
+
+#include <boost/functional/hash.hpp>
+#include <cassert>
+
+// This example illustrates how to customise ndnboost::hash portably, so that
+// it'll work on both compilers that don't implement argument dependent lookup
+// and compilers that implement strict two-phase template instantiation.
+
+namespace foo
+{
+    template <class T>
+    class custom_type
+    {
+        T value;
+    public:
+        custom_type(T x) : value(x) {}
+
+        std::size_t hash() const
+        {
+            ndnboost::hash<T> hasher;
+            return hasher(value);
+        }
+    };
+}
+
+#ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
+namespace ndnboost
+#else
+namespace foo
+#endif
+{
+    template <class T>
+    std::size_t hash_value(foo::custom_type<T> x)
+    {
+        return x.hash();
+    }
+}
+
+int main()
+{
+    foo::custom_type<int> x(1), y(2), z(1);
+
+    ndnboost::hash<foo::custom_type<int> > hasher;
+
+    assert(hasher(x) == hasher(x));
+    assert(hasher(x) != hasher(y));
+    assert(hasher(x) == hasher(z));
+
+    return 0;
+}