result_type operator()();
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// random_device example
#include <iostream>
#include <random>
int main ()
{
std::random_device rd;
std::cout << "default random_device characteristics:" << std::endl;
std::cout << "minimum: " << rd.min() << std::endl;
std::cout << "maximum: " << rd.max() << std::endl;
std::cout << "entropy: " << rd.entropy() << std::endl;
std::cout << "a random number: " << rd() << std::endl;
return 0;
}default random_device characteristics: minimum: 0 maximum: 4294967295 entropy: 32 a random number: 3286206242