Hi, I failed to compile random_demo.cpp (www.boost.org/libs/random/random_demo.cpp) with VC++6.0 under WINXP sp2. I have attached the error message below. (I have installed VC++6.0 service pack 4,5 and 6.) Could anybody help? Examples of using boost::random will help too, such as uniform_01 and normal_distribution, etc. Thanks a lot. Vivid (test2.cpp is random_demo.cpp) e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(29) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(30) : warning C4181: qualifier applied to reference type ignored e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(30) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(31) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(32) : warning C4181: qualifier applied to reference type ignored e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(32) : warning C4181: qualifier applied to reference type ignored e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(32) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\ptr_helper.hpp(32) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(32) : see reference to class template instantiation 'boost::random::detail::ptr_helper &>' being c ompiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(33) : error C2039: 'result_type' : is not a member of '`global namespace'' e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(33) : error C2146: syntax error : missing ';' before identifier 'result_type' e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(33) : error C2868: 'result_type' : illegal syntax for using-declaration; expected qualified-name e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(42) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(43) : warning C4181: qualifier applied to reference type ignored e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\detail\pass_through_engine.hpp(43) : error C2529: '<Unknown>' : reference to reference is illegal e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(90) : see reference to class template instantiation 'boost::random::detail::pass_through_engine &>' being c ompiled E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(104) : error C2529: '<Unknown>' : reference to reference is illegal E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(105) : warning C4181: qualifier applied to reference type ignored E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(105) : error C2529: '<Unknown>' : reference to reference is illegal E:\temp\test2\test2.cpp(71) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_real<double> >' being compiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(104) : error C2529: '<Unknown>' : reference to reference is illegal E:\temp\test2\test2.cpp(116) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_int<int> >' being compiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(105) : warning C4181: qualifier applied to reference type ignored E:\temp\test2\test2.cpp(116) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_int<int> >' being compiled e:\shared\boost_1_32_0\boost\random\variate_generator.hpp(105) : error C2529: '<Unknown>' : reference to reference is illegal E:\temp\test2\test2.cpp(116) : see reference to class template instantiation 'boost::variate_generator &,class boost::uniform_int<int> >' being compiled E:\temp\test2\test2.cpp(124) : error C2679: binary '<<' : no operator defined which takes a right-hand operand of type 'class boost::random::linear_congruential' (or there is no acceptable conversion) Error executing cl.exe.