Generate random numbers in C++-11 in different parts of a code using the same seed

I am trying to encapsulate a class to generate random numbers controlling by seed and by the range of random values. I want to call this class from different parts of my codes, with different ranges, but using the same seed.

Following suggestions of other post (Encapsulated Random number generator in C++-11 using boost) I implemented the following code:

My Random Number Generator class:

    #include <random>
    #include <iostream>

    typedef std::mt19937                     ENG;    // Mersenne Twister
    typedef std::uniform_int_distribution<> iDIST;   // Uniform Integer Distribution

    class RNG {
      private:
         ENG eng;
         iDIST idist;

      public:
         iDIST::result_type igen() { return idist(eng); }
         RNG(ENG eng_,int imin,int imax)
         : idist(imin,imax)
         {eng = eng_; }

    };

A function to create an object of RNG class and print the random values:

    void myfunc(ENG eng_,int imin, int imax, int N){
        RNG myirn(eng_,imin,imax);
        for (int i = 0; i < N; i++){
            std::cout << myirn.igen() << std::endl;
        }
        return;
    }

My main function:

    int main(int argc, char **argv){
        int myseed = 1;
        int N = 5;
        int imin1 = 1;
        int imax1 = 10;

    //Seed globally
        ENG eng_;
        eng_.seed(myseed);

        std::cout << "Range = [" << imin1 << "," << imax1 << "]" << std::endl;
        myfunc(eng_,imin1,imax1,N);
            std::cout << "Range = [" << imin1 << "," << imax1 << "]" << std::endl;
        myfunc(eng_,imin1,imax1,N);


    return 0;
    }

As you can see, my strategy was to seed my random number generator globally (in the main function) and pass the variable eng_ as a parameter to the function func, that will instantiate the RNG object and print the random values. If everything were correct, this code should print 2 sequences of 5 random numbers within the same range but with different values. However, they are exactly the same sequence. Could anyone help me to fix this?