Hi, I have some strange behavior on win XP with VC 8.0 version and boost::random library. When I use variate_generator helper template with uniform_01 distribution, I always get an compiler error. like as: //code boost::mt19937 rng(time(0)); boost::uniform_01<mt19937> u01(rng); boost::variate_generator<mt19937, uniform_01<mt19937> > die401(rng, u01); //compile info error C2039: 'input_type' : is not a member of 'boost::uniform_01<UniformRandomNumberGenerator>' with [ UniformRandomNumberGenerator=boost::mt19937 ] f:\my documents\visual studio 2005\projects\testboost\testrandom\testrandom.cpp(169) : see reference to class template instantiation 'boost::variate_generator<Engine,Distribution>' being compiled with [ Engine=boost::mt19937, Distribution=boost::uniform_01<boost::mt19937> ] Actually, the uniform_01 class doesn't declare a type named input_type in uniform_01.hpp, because uniform_01 distribution can accept both IntegerType and RealType UniformRandomGenerator. It seems that variate_generator can not support the uniform_01. However, I found the engine_helper struct be specialized for uniform_01 and uniform_int_float in variate_generator.hpp. I got confused. It's vc8.0compiler's bug? How can I get a variate_generator for uniform_01 distribution? Any feedback welcomed!! Thanks. Waveform.