Re: [Boost-users] How can I use random library in a class? Can any one with kindness help me?

Can anyone tell me why?

You need to initialize the base class, not the base class's members. So: class Usedchild:public Used{ public: Usedchild(Matrix inputmatrix, Vec inputvec):Used(inputmatrix,inputvec){}; }; should work. It may also be worth your while to look at a text on C++ syntax before diving too deep into the complicated parts of Boost.