std::lognormal_distribution<RealType>:: lognormal_distribution

From cppreference.com
lognormal_distribution ( ) : lognormal_distribution ( 0.0 ) { }
(1) (since C++11)
explicit lognormal_distribution ( RealType m, RealType s = 1.0 ) ;
(2) (since C++11)
explicit lognormal_distribution ( const param_type & params ) ;
(3) (since C++11)

Constructs a new distribution object.

2) Uses m and s as the distribution parameters.
3) Uses params as the distribution parameters.

Parameters

m - the m distribution parameter (log-scale)
s - the s distribution parameter (shape)
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