public member function
<random>
std::exponential_distribution::operator() (1)template<class URNG>result_type operator()(URNG& g);(2)
template<class URNG>result_type operator()(URNG& g, const param_type& parm);
Generate random number
Returns a new random number that follows the distribution's parameters associated to the object (version 1) or those specified by parm (version 2).The generator object (g) supplies uniformly-distributed random integers through its operator() member function. The exponential_distribution object transforms the values obtained this way so that successive calls to this member function with the same arguments produce floating-point values that follow an exponential distribution with the appropriate lambda parameter.
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// exponential_distribution example
#include <iostream>
#include <chrono>
#include <thread>
#include <random>
int main()
{
// construct a trivial random generator engine from a time-based seed:
int seed = std::chrono::system_clock::now().time_since_epoch().count();
std::default_random_engine generator (seed);
std::exponential_distribution<double> distribution (1.0);
std::cout << "ten beeps, spread by 1 second, on average: " << std::endl;
for (int i=0; i<10; ++i) {
double number = distribution(generator);
std::chrono::duration<double> period ( number );
std::this_thread::sleep_for( period );
std::cout << "beep!" << std::endl;
}
return 0;
}ten beeps, spread by 1 second, on average: beep! beep! beep! beep! beep! beep! beep! beep! beep! beep!
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