tmp/tmpae64xly3/{from.md → to.md}
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##### Class template `poisson_distribution` <a id="rand.dist.pois.poisson">[[rand.dist.pois.poisson]]</a>
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A `poisson_distribution` random number distribution produces integer
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values i ≥ 0 distributed according to the discrete probability function
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$$
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= \frac{ e^{-\mu} \mu^{i} }
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{ i\,! }
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\; \mbox{.}$$ The distribution parameter μ is also known as this
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distribution’s *mean* .
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``` cpp
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template<class IntType = int>
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class poisson_distribution
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{
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// types
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using result_type = IntType;
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using param_type = unspecified;
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// constructors and reset functions
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-
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explicit poisson_distribution(const param_type& parm);
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void reset();
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// generating functions
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template<class URBG>
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result_type max() const;
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};
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```
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``` cpp
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explicit poisson_distribution(double mean
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```
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*
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*
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corresponds to the parameter of the distribution.
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``` cpp
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double mean() const;
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```
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##### Class template `poisson_distribution` <a id="rand.dist.pois.poisson">[[rand.dist.pois.poisson]]</a>
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A `poisson_distribution` random number distribution produces integer
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values i ≥ 0 distributed according to the discrete probability function
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$$P(i\,|\,\mu) = \frac{e^{-\mu} \mu^{i}}{i\,!} \text{ .}$$ The
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distribution parameter μ is also known as this distribution’s *mean* .
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``` cpp
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template<class IntType = int>
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class poisson_distribution
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{
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// types
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using result_type = IntType;
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using param_type = unspecified;
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// constructors and reset functions
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poisson_distribution() : poisson_distribution(1.0) {}
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explicit poisson_distribution(double mean);
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explicit poisson_distribution(const param_type& parm);
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void reset();
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// generating functions
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template<class URBG>
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result_type max() const;
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};
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```
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``` cpp
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explicit poisson_distribution(double mean);
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```
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*Preconditions:* 0 < `mean`.
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*Remarks:* `mean` corresponds to the parameter of the distribution.
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``` cpp
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double mean() const;
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```
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