--- shuffle_output.hpp	2011-04-05 22:27:52.000000000 +0100
+++ shuffle_output.hpp	2012-07-25 11:42:13.000000000 +0100
@@ -28,13 +28,13 @@
 class shuffle_output : public shuffle_order_engine<URNG, k>
 {
     typedef shuffle_order_engine<URNG, k> base_t;
-    typedef typename base_t::result_type result_type;
 public:
+    typedef typename base_t::result_type result_type;
     shuffle_output() {}
     template<class T>
-    shuffle_output(T& arg) : base_t(arg) {}
+    explicit shuffle_output(T& arg) : base_t(arg) {}
     template<class T>
-    shuffle_output(const T& arg) : base_t(arg) {}
+    explicit shuffle_output(const T& arg) : base_t(arg) {}
     template<class It>
     shuffle_output(It& first, It last) : base_t(first, last) {}
     result_type min BOOST_PREVENT_MACRO_SUBSTITUTION ()