//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)
    {
        mygen gen(treshmin, treshmax);
                .....
                double curThreshold = gen();
                ...
         }

//file: utilities.h
struct mygen
{
    mygen(double low, double high) : dist(low, high) {}
    double operator()() { return dist(eng); }
  private:

    std::mt19937 engine;
    std::uniform_real_distribution<> dist;
}