public member function
Returns the greatest lower bound of the range of values potentially returned by member operator().
Because normal_distribution represents an unbounded distribution, the function returns the minimum value representable by result_type:
-numeric_limits<result_type>::infinity(), depending on library implementation.
The value of the greatest lower bound of the distribution's range that is representable with result_type.
result_type is a member type, defined as an alias of the first class template parameter (RealType).