public member function
<random>
std::exponential_distribution::param (1)param_type param() const;(2)
void param (const param_type& parm);
Distribution parameters
The first version (1) returns an object with the parameters currently associated with the distribution object.An exponential_distribution is defined by a single parameter: lambda (λ), which can be interpreted as the mean frequence of occurrences. An object of type param_type carries this information, but it is meant to be used only to construct or specify the parameters for a exponential_distribution object, not to inspect the individual parameters.
To inspect the individual parameter associated to the distribution object you can use: exponential_distribution::lambda.
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// exponential_distribution::param
#include <iostream>
#include <random>
int main()
{
std::default_random_engine generator;
std::exponential_distribution<double> d1(0.8);
std::exponential_distribution<double> d2(d1.param());
// print two independent values:
std::cout << d1(generator) << std::endl;
std::cout << d2(generator) << std::endl;
return 0;
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