Update documentation

examples/template.cpp

@@ -3,9 +3,14 @@
 // 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)
 
+// Force use of assert.
+#if defined(NDEBUG)
+#undef NDEBUG
+#endif
+
 #include "template.hpp"
-#include <cassert>
 #include <boost/unordered_set.hpp>
+#include <cassert>
 
 int main()
 {