# std::poisson_distribution<IntType>::poisson_distribution

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< cpp‎ | numeric‎ | random‎ | poisson distribution

poisson_distribution() : poisson_distribution(1.0) {} | (1) | (since C++11)
explicit poisson_distribution( double mean ); | (2) | (since C++11)
explicit poisson_distribution( const param_type& params ); | (3) | (since C++11)

Constructs a new distribution object. (2) uses `mean` as the distribution parameter. (3) uses `params` as the distribution parameter.

### Parameters

mean | - | the μ distribution parameter (the mean of the distribution)
params | - | the distribution parameter set

### Notes

Requires that 0 < mean.

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
P0935R0 | C++11 | default constructor was explicit | made implicit

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