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std::random_device

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std::random_device
 
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class random_device;
 ( C++11)
std::random_device . (, ) .
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std::random_device is a uniformly-distributed integer random number generator, which produces non-deterministic random numbers, if a non-deterministic source (e.g. a hardware device) is available to the implementation.
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result_type unsigned int

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Construction
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the assignment operator is deleted
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Generation
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Characteristics
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obtains the entropy estimate for the non-deterministic random number generator
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gets the smallest possible value in the output range
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#include <iostream>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::map<int, int> hist;
    for(int n=0; n<20000; ++n)
        ++hist[rd()%10];
    for(auto p : hist)
        std::cout << p.first << " : " << std::string(p.second/100, '*') << '\n';
}

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