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## Class template poisson_distribution

boost::poisson_distribution

## Synopsis

    // In header: <boost/random/poisson_distribution.hpp>

    template<typename IntType = int, typename RealType = double>
    class poisson_distribution {
    public:
      // types
      typedef RealType input_type;
      typedef IntType  result_type;

      // construct/copy/destruct
      poisson_distribution(const RealType & = RealType(1));

      // public member functions
      RealType mean() const;
      void reset() ;
      template<typename Engine> result_type operator()(Engine &) ;
    };

## Description

An instantiation of the class template `poisson_distribution` is a model of random distribution . The poisson distribution has

### `poisson_distribution` public construct/copy/destruct

1.     poisson_distribution(const RealType & mean_arg = RealType(1));

   Constructs a `poisson_distribution` with the parameter `mean`.

   Requires: mean > 0

### `poisson_distribution` public member functions

1.     RealType mean() const;

   Returns: the "mean" parameter of the distribution.

2.     void reset() ;

3.     template<typename Engine> result_type operator()(Engine & eng) ;