std::seed_seq (3) Linux Manual Page

std::seed_seq – std::seed_seq

Synopsis

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 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 std::uint_least32_t

Member functions

              constructs and seeds the std::seed_seq object
constructor (public member function)

operator= not copy-assignable
              (public member function)
(deleted)
              calculates the bias-eliminated, evenly distributed 32-bit values
generate (public member function)
              obtains the number of 32-bit values stored in std::seed_seq
size (public member function)
              obtains the 32-bit values stored in std::seed_seq
param (public member function)

Example

// Run this code

#include <random>

#include <cstdint>

#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:

  4204997637
  4246533866
  1856049002
  1129615051
  690460811
  1075771511
  46783058
  3904109078
  1534123438
  1495905678