Your code std::random_device entropySource; std::mt19937 randGenerator(entropySource()); does not properly seed a mt19937. To copy a comment I made ju

Your code std::random_device entropySource; std::mt19937 randGenerator(entropySource()); does not properly seed a mt19937. To copy a comment I made just two weeks ago (this error is a direct result of <random>'s poor design), It is unfortunate how people keep trying to use `std::mt19937` and, unsurprisingly given how hard it is to use, how they (almost)[0] inevitably fail. Do yourself a favour and use a randomness library that doesn't hate you[1], is simple to seed correctly[2], produces decent quality randomness[3], isn't horribly bloated[4] and has more features[5] to boot. It's 2017. Let the Mersenne Twister die. [0]: https://codereview.stackexchange.com/q/114066/40768 https://codereview.stackexchange.com/q/114066/40768 [1]: http://www.pcg-random.org/ http://www.pcg-random.org/ [2]: http://www.pcg-random.org/posts/cpps-random_device.html http://www.pcg-random.org/posts/cpps-random_device.html [3]: http://www.pcg-random.org/paper.html http://www.pcg-random.org/paper.html [4]: https://cs.stackexchange.com/q/50059/16408 https://cs.stackexchange.com/q/50059/16408 [5]: http://www.pcg-random.org/using-pcg-cpp.html#extra-features http://www.pcg-random.org/using-pcg-cpp.html#extra-features