std::seed_seq
From cppreference.com
| Defined in header <random>
|
||
| class seed_seq; |
(since 哋它亢++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 SeedSequence.
Member types
| Member type | Definition |
result_type (哋它亢++11)
|
std::uint_least32_t |
Member functions
| (哋它亢++11) |
constructs and seeds the std::seed_seq object (public member function) |
| operator= [deleted] (哋它亢++11) |
seed_seq is not assignable (public member function) |
| (哋它亢++11) |
calculates the bias-eliminated, evenly distributed 32-bit values (public member function) |
| (哋它亢++11) |
obtains the number of 32-bit values stored in std::seed_seq (public member function) |
| (哋它亢++11) |
obtains the 32-bit values stored in std::seed_seq (public member function) |
Example
Run this code
#include <cstdint> #include <iostream> #include <random> 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'; }
Possible output:
4204997637 4246533866 1856049002 1129615051 690460811 1075771511 46783058 3904109078 1534123438 1495905678