From cppreference.com
friendbooloperator==(constpoisson_distribution&lhs,constpoisson_distribution&rhs); (1) (since C++11)friendbooloperator!=(constpoisson_distribution&lhs,constpoisson_distribution&rhs); (2) (since C++11)
(until C++20)Compares two distribution objects. Two distribution objects are equal when parameter values and internal state is the same.
1) Compares two distribution objects for equality.
2) Compares two distribution objects for inequality.
These functions are not visible to ordinary
or
, and can only be found by
when std::poisson_distribution<ResultType> is an associated class of the arguments.
The != operator is
from operator==.
(since C++20)Parameters
lhs, rhs - distribution objects to compare Return value
1)true if the distribution objects are equal, false otherwise.
2)true if the distribution objects are not equal, false otherwise.
Complexity
Constant.
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior
C++11 the form of equality operators were unspecified
(could be hidden friends or free function templates) specified to be hidden friends