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Showing content from https://cplusplus.com/reference/random/seed_seq/size/ below:

public member function

<random>

std::seed_seq::size

Return internal sequence size

Returns the number of elements in the object's internal sequence.

Parameters none

Return Value The number of elements in the container.
size_t is an unsigned integral type.

Example 
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// seed_seq::size
#include <iostream>
#include <random>
#include <iterator>
#include <array>

int main ()
{
  std::seed_seq seed = {102,406,7892};

  std::cout << "size: " << seed.size() << std::endl;

  std::ostream_iterator<unsigned> out (std::cout," ");
  std::cout << "elements: "; seed.param(out); std::cout << std::endl;

  return 0;
}

Output: 
size: 3
elements: 102 406 7892


Complexity Constant.

See also
seed_seq::seed_seq
Seed sequence constructor (public member function)
seed_seq::param
Copy internal sequence (public member function)

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