Why do I get the same sequence for every run with std::random_device with mingw gcc4.8.1?

Question

I use the following code to test the C++ library.

Why do I get the exact same sequence for every run of the compiled executable? Is

Answer 1

You may need to pass a parameter to the constructor:

https://gcc.gnu.org/onlinedocs/gcc-4.9.1/libstdc++/api/a00899.html