# std::normal_distribution<RealType>::normal_distribution

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< cpp‎ | numeric‎ | random‎ | normal distribution

normal_distribution() : normal_distribution(0.0) {} | (1) | (since C++11)
explicit normal_distribution( RealType mean, RealType stddev = 1.0 ); | (2) | (since C++11)
explicit normal_distribution( const param_type& params ); | (3) | (since C++11)

Constructs a new distribution object.

2) Uses mean and stddev as the distribution parameters.
3) Uses params as the distribution parameters.

The behavior is undefined if stddev is not greater than zero.

### Parameters

mean | - | the μ distribution parameter (mean)
stddev | - | the σ distribution parameter (standard deviation)
params | - | the distribution parameter set

### 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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