An
exponential_distribution random number distribution
produces random numbers
x>0
distributed according to
the probability density function
p(x|λ)=λe−λx .template<class RealType = double>
class exponential_distribution {
public:
using result_type = RealType;
using param_type = unspecified;
exponential_distribution() : exponential_distribution(1.0) {}
explicit exponential_distribution(RealType lambda);
explicit exponential_distribution(const param_type& parm);
void reset();
template<class URBG>
result_type operator()(URBG& g);
template<class URBG>
result_type operator()(URBG& g, const param_type& parm);
RealType lambda() const;
param_type param() const;
void param(const param_type& parm);
result_type min() const;
result_type max() const;
};