std::geometric_distribution<IntType>:: p

From cppreference.com
double p ( ) const ;
(since C++11)

Returns the p distribution parameter the distribution was constructed with. The parameter defines the probability of a trial generating true . The default value is 0.5 .

Parameters

(none)

Return value

Floating point value identifying the p distribution parameter.

See also

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