26 Numerics library [numerics]

26.6 Random number generation [rand]

26.6.9 Random number distribution class templates [rand.dist]

26.6.9.4 Poisson distributions [rand.dist.pois]

26.6.9.4.2 Class template exponential_­distribution [rand.dist.pois.exp]

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An exponential_­distribution random number distribution produces random numbers distributed according to the probability density function
template<class RealType = double> class exponential_distribution { public: // types using result_type = RealType; using param_type = unspecified; // constructors and reset functions exponential_distribution() : exponential_distribution(1.0) {} explicit exponential_distribution(RealType lambda); explicit exponential_distribution(const param_type& parm); void reset(); // generating functions template<class URBG> result_type operator()(URBG& g); template<class URBG> result_type operator()(URBG& g, const param_type& parm); // property functions RealType lambda() const; param_type param() const; void param(const param_type& parm); result_type min() const; result_type max() const; };
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explicit exponential_distribution(RealType lambda);
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Preconditions: .
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Remarks: lambda corresponds to the parameter of the distribution.
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RealType lambda() const;
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Returns: The value of the lambda parameter with which the object was constructed.