//file: myclass.h
       status myclass::doThat(param1, param2){

          bool cond = shouldIStop(param1, param2, param3, param4);
          status myStatus = NOTLEAF;
          if(!cond){
              ...
              doSomething(param3, param4);
              ...
              ...
              ...
              doThat(param1, param2, param3, param4);
          }
          else{
              ...
              ...
              myStatus = LEAF;
              ...
          }
          return (myStatus);
        }

    void myclass::doSomething(double treshmin, double treshmax)
    {
        std::random_device rd;
        static std::mt19937 engine(rd());
                .....
                double curThreshold = randomDoubleEngine(engine, treshmin, treshmax );
                ...
         }

//file: utilities.h
template <typename Generator>
double randomDoubleEngine(Generator& engine, double low_bound, double high_bound )
{
    if (low_bound > high_bound){
        std::swap(low_bound, high_bound);
    }

    return std::uniform_real_distribution<>( low_bound, high_bound )( engine );
}