Mingw random number generator generator [duplicate]

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• why do I get same sequence for everyrun with std::random_device with mingw gcc4.8.1 4 answers

I have problem on MinGW 4.8.1-4 using random number generator.

class RandomGenInt
{
    std::random_device rd;
    std::mt19937 gen;
    std::uniform_int_distribution<d_type::Buint> i_dis;
public:
    RandomGenInt(d_type::Bint min,d_type::Bint max)
    {
    gen.seed(rd());
i_dis=std::uniform_int_distribution<d_type::Buint>(min,max);
    }
    d_type::Buint generateRandomInt()
    {

        return i_dis(gen);
    }

};
class RandomGenFloat
{

    std::random_device rd;
    std::mt19937 gen;
    std::uniform_real_distribution<d_type::Bfloat> f_dis;
public:
    RandomGenFloat(d_type::Buint min=0,d_type::Buint max=1000000000)
    {
    gen.seed(rd());
f_dis=std::uniform_real_distribution<d_type::Bfloat>(min,max);

    }
    d_type::Bfloat generateRandomFloat()
    {

        return f_dis(gen);
    }
};

this functions always return the same numbers.

On Linux using gcc the problem doesn't occures... so... what should I do to generate number in c++ on Windows?