Function none3

tests/test_methods_and_attributes.cpp:130–130

int none1(const NoneTester &obj) { return obj.answer; }
int none2(NoneTester *obj) { return obj ? obj->answer : -1; }
int none3(std::shared_ptr<NoneTester> &obj) { return obj ? obj->answer : -1; }
int none4(std::shared_ptr<NoneTester> *obj) { return obj && *obj ? (*obj)->answer : -1; }
int none5(const std::shared_ptr<NoneTester> &obj) { return obj ? obj->answer : -1; }