Difference between revisions of "cpp/numeric/random/seed seq"
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class seed_seq; | class seed_seq; | ||
Revision as of 13:56, 15 June 2012
| Defined in header <random>
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| class seed_seq; |
(since C++11) | |
std::seed_seq consumes a sequence of integer-valued data and produces a requested number of unsigned integer values i, 0 ≤ i < 232, based on the consumed data. The produced values are distributed over the entire 32-bit range even if the consumed values are close.
It provides a way to seed a large number of random number engines or to seed a generator that requires a lot of entropy, given a small seed or a poorly distributed initial seed sequence.
std::seed_seq meets the requirements of Template:concept.
Member types
| Member type | Definition |
result_type
|
uint_least32_t |
Member functions
| constructs and seeds the std::seed_seq object (public member function) | |
| operator= (deleted) |
not copy-assignable (public member function) |
| calculates the bias-eliminated, evenly distributed 32-bit values (public member function) | |
| obtains the number of 32-bit values stored in std::seed_seq (public member function) | |
| obtains the 32-bit values stored in std::seed_seq (public member function) |
Example
Run this code
#include <random> #include <iostream> int main() { std::seed_seq seq({1,2,3,4,5}); std::vector<std::uint32_t> seeds(10); seq.generate(seeds.begin(), seeds.end()); for(std::uint32_t n : seeds) std::cout << n << '\n'; }
Output:
3890079369 567513683 1868094942 738085780 2849436979 1267185068 3817490445 2911200628 2374022914 1233116465
