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Showing content from https://cplusplus.com/random_device::random_device below:

public member function

<random>

explicit random_device (const string& token = /* see below */ );

Construct random device

If the random_device cannot be initialized, an exception derived from the standard exception class is thrown.

token

An identifier of a system-specific source of randomness.
The default value is a valid source for the system.
For example, on some implementations for linux systems, this parameter is interpreted as a filesystem path, and has a default value of "/dev/urandom".
string is a standard instantiation of basic_string.

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// random_device constructor
#include <iostream>
#include <random>

int main ()
{
  std::random_device rd;

  std::cout << "Random value: " << rd() << std::endl;

  return 0;
}

random_device::operator()

Generate random number (public member function)

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