--- uniform_01.hpp.orig 2008-11-27 02:10:56.000000000 +0800                                                
+++ uniform_01.hpp      2009-01-26 16:56:46.000000000 +0800                                                
@@ -39,7 +39,7 @@                                                                                          
   BOOST_STATIC_ASSERT(!std::numeric_limits<RealType>::is_integer);                                        
 #endif                                                                                                    
                                                                                                           
-  explicit uniform_01(base_type rng)                                                                      
+  explicit uniform_01(const base_type& rng)                                                               
     : _rng(rng),                                                                                          
       _factor(result_type(1) /                                                                            
               (result_type((_rng.max)()-(_rng.min)()) +