29 Numerics library [numerics]

29.6 Random number generation [rand]

29.6.8 Random number distribution class templates [rand.dist]

29.6.8.4 Poisson distributions [rand.dist.pois]

29.6.8.4.2 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
    explicit exponential_distribution(RealType lambda = 1.0);
    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 = 1.0);
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Requires: .
3
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Effects: Constructs an exponential_­distribution object; 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.