c++ - generate same random permutation on every computer -


i using random_shuffle on sequence a 1000 times. want ensure on every computer final sequence same. might undesirable, still want achieve this. srand(x) ensure ?

there 2 sources of differences in resulting shuffle: algorithm rand() not specified, different implementations produce different sequences of numbers; , algorithm random_shuffle not specified, so, again, different implementations produce different results, same sequence of pseudo-random numbers.

you can eliminate first problem using of random-number generators in c++11; they're specified in detail, including, specializations, requirement 10,000th value, great in debugging implementation. however, there's no analog shuffling. in particular, algorithm std::shuffle not specified, won't give reproducible results. you'll have write own. that's not difficult (nowhere near difficult writing engine), little research; there lots of discussion out there start from.


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