51 class PollCopyVariable : public Variable<T> {
58   PollCopyVariable(const std::string& name, const T& ref, const bool* is_set_p,  in PollCopyVariable()  function
62   PollCopyVariable(const std::string& name, const T& ref, const bool* is_set_p)  in PollCopyVariable()  function
63       : PollCopyVariable(name, ref, is_set_p, std::string()) {}  in PollCopyVariable()
64   PollCopyVariable(const std::string& name, const T& ref)  in PollCopyVariable()  function
65       : PollCopyVariable(name, ref, nullptr) {}  in PollCopyVariable()
67   PollCopyVariable(const std::string& name, const base::TimeDelta poll_interval,  in PollCopyVariable()  function
72   PollCopyVariable(const std::string& name, const base::TimeDelta poll_interval,  in PollCopyVariable()  function
74       : PollCopyVariable(name, poll_interval, ref, is_set_p, std::string()) {}  in PollCopyVariable()
75   PollCopyVariable(const std::string& name, const base::TimeDelta poll_interval,  in PollCopyVariable()  function
77       : PollCopyVariable(name, poll_interval, ref, nullptr) {}  in PollCopyVariable()