How can I use random library in a class? Can any one with kindness help me? I am using boost(version boost_1_37_0) random library in Dev-C++ with gcc. and the code is: #include "boost/random/normal_distribution.hpp" #include ................................. class TransferedSignal{ public: TransferedSignal(){ one(0.0,1.0) ; die(rng, one); }; double output(){ return die(); }; private: boost::mt19937 rng; boost::uniform_real<> one; boost::variate_generator > die; }; int main(int argc, char *argv[]) { TransferedSignal transferedsignal(); for (int i=0; i<100;i++) transferedsignal.output(); system("PAUSE"); return 0; } But the complier told me that: mainprojectme13.cpp: In constructor 'TransferedSignal::TransferedSignal()': mainprojectme13.cpp:154: error: no matching function for call to 'boost::variate_generator::variate_generator()' F:/CB2009/boost_1_37_0/boost/random/variate_generator.hpp:97: note: candidates are: boost::variate_generator::variate_generator(Engine, Distribution) [with Engine = boost::mt19937&, Distribution = boost::uniform_real<double>] F:/CB2009/boost_1_37_0/boost/random/variate_generator.hpp:87: note: boost::variate_generator::variate_generator(const boost::variate_generator&) mainprojectme13.cpp:155: error: no match for call to '(boost::uniform_real<double>) (double, double)' mainprojectme13.cpp:156: error: no match for call to '(boost::variate_generator) (boost::mt19937&, boost::uniform_real<double>&)' F:/CB2009/boost_1_37_0/boost/random/variate_generator.hpp:100: note: candidates are: typename Distribution::result_type boost::variate_generator::operator()() [with Engine = boost::mt19937&, Distribution = boost::uniform_real<double>] mainprojectme13.cpp: In function 'int main(int, char**)': mainprojectme13.cpp:173: error: request for member 'output' in 'transferedsignal', which is of non-class type 'TransferedSignal()' And I do not know how to solve it. Shauld I define "boost::variate_generator::variate_generator() " in the random library? But God knows what will be happened after that. Can any one with kindness help me? Thanks a lot.