int* ptr = nullptr; if(ptr.isNull()) { std::cout << "Pointer is null." << std::endl; } else { std::cout << "Pointer is not null." << std::endl; }
class MyClass { private: int* ptr = nullptr; public: MyClass() {} bool isNull() { return ptr == nullptr; } }; MyClass obj; if(obj.isNull()) { std::cout << "Object has null pointer." << std::endl; } else { std::cout << "Object does not have null pointer." << std::endl; }It is difficult to determine the package library for this example without more context. However, based on the usage of the class and method names, it is possible that it is part of a larger library for managing memory and pointer manipulation.