std::exponential_distribution<RealType>:: lambda

From cppreference.com
RealType lambda ( ) const ;
(since C++11)

Returns the λ distribution parameter the distribution was constructed with. The parameter defines the rate of events, per unit. The default value is 1.0 .

Parameters

(none)

Return value

Floating point value identifying the rate of events per unit.

See also

(C++11)
gets or sets the distribution parameter object
(public member function)