mercredi 23 septembre 2015

Random output different between implementations

I've tried this program with libstdc++, libc++ and dinkumware:

#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <functional>
#include <limits>

int main()
{
    std::vector<int> v(10);

    std::mt19937 rand{0};
    std::uniform_int_distribution<> dist(
        1, 10
    );

    std::generate_n(v.begin(), v.size(),
        std::bind(dist, rand));

    for (auto i : v)
        std::cout << i << " ";
}

Output respectively is:

6 6 8 9 7 9 6 9 5 7 

6 1 4 4 8 10 4 6 3 5 

5 10 4 1 4 10 8 4 8 4 

The output is consistent for each run but as you can see, they're different. Explain?




Aucun commentaire:

Enregistrer un commentaire