29 Numerics library [numerics]

A weibull_­distribution random number distribution produces random numbers $x\ge 0$ distributed according to the probability density function

$$p(x|a,b)=\frac{a}{b}\cdot {\left(\frac{x}{b}\right)}^{a-1}\cdot \exp \left(-{\left(\frac{x}{b}\right)}^a\right)\text{.}$$

template<class RealType = double>
  class weibull_distribution {
  public:
    // types
    using result_type = RealType;
    using param_type  = unspecified;

    // constructor and reset functions
    explicit weibull_distribution(RealType a = 1.0, RealType b = 1.0);
    explicit weibull_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 a() const;
    RealType b() const;
    param_type param() const;
    void param(const param_type& parm);
    result_type min() const;
    result_type max() const;
  };