public member function
<random>
std::piecewise_constant_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 piecewise_constant_distribution object transforms the values obtained this way so that successive calls to this member function with the same arguments produce values that follow a piecewise constant distribution with the appropriate intervals and probability densities.
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// piecewise_constant_distribution::operator()
#include <iostream>
#include <chrono>
#include <random>
int main()
{
// construct a trivial random generator engine from a time-based seed:
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
std::default_random_engine generator (seed);
std::piecewise_constant_distribution<double> distribution ( 4, 0.0, 10.0, [](double x){return x;} );
std::cout << "intervals : ";
for (double x:distribution.intervals()) std::cout << x << " ";
std::cout << std::endl;
std::cout << "densities : ";
for (double x:distribution.densities()) std::cout << x << " ";
std::cout << std::endl;
return 0;
}intervals: 0 2.5 5. 7.5 10 densities: 0.025 0.075 0.125 0.175
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