std::seed_seq
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std::seed_seq
Defined in header
<random>
class seed_seq;
(since C++11)
std::seed_seq consumes a sequence of integer-valued data and produces a requested number of 32-bit unsigned integer values, 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.
[edit] Nested types
Type
Definition
result_type
std::uint_least32_t
[edit] Data members
Member
Description
[edit] Member functions
operator=
[deleted]
std::seed_seq is not assignable (public member function)
[edit] 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