50 template<typename T>
51 class PollCopyVariable : public Variable<T> {
58   PollCopyVariable(const std::string& name, const T& ref, const bool* is_set_p,  in PollCopyVariable()
60       : Variable<T>(name, kVariableModePoll), ref_(ref), is_set_p_(is_set_p),  in PollCopyVariable()
62   PollCopyVariable(const std::string& name, const T& ref, const bool* is_set_p)  in PollCopyVariable()
64   PollCopyVariable(const std::string& name, const T& ref)  in PollCopyVariable()
68                    const T& ref, const bool* is_set_p,  in PollCopyVariable()
70       : Variable<T>(name, poll_interval), ref_(ref), is_set_p_(is_set_p),  in PollCopyVariable()
73                    const T& ref, const bool* is_set_p)  in PollCopyVariable()
76                    const T& ref)  in PollCopyVariable()
84   inline const T* GetValue(base::TimeDelta /* timeout */,  in GetValue()
95     return new T(ref_);  in GetValue()
100   const T& ref_;
112 template<typename T>
113 class ConstCopyVariable : public Variable<T> {
118   ConstCopyVariable(const std::string& name, const T& obj)  in ConstCopyVariable()
119       : Variable<T>(name, kVariableModeConst), obj_(obj) {}  in ConstCopyVariable()
123   const T* GetValue(base::TimeDelta /* timeout */,  in GetValue()
125     return new T(obj_);  in GetValue()
130   const T obj_;
135 template<typename T>
136 class CallCopyVariable : public Variable<T> {
138   CallCopyVariable(const std::string& name, base::Callback<T(void)> func)  in CallCopyVariable()
139       : Variable<T>(name, kVariableModePoll), func_(func) {}  in CallCopyVariable()
142                    base::Callback<T(void)> func)  in CallCopyVariable()
143       : Variable<T>(name, poll_interval), func_(func) {}  in CallCopyVariable()
147   const T* GetValue(base::TimeDelta /* timeout */,  in GetValue()
151     return new T(func_.Run());  in GetValue()
158   base::Callback<T(void)> func_;
171 template<typename T>
172 class AsyncCopyVariable : public Variable<T> {
175       : Variable<T>(name, kVariableModeAsync), has_value_(false) {}  in AsyncCopyVariable()
177   AsyncCopyVariable(const std::string& name, const T value)  in AsyncCopyVariable()
178       : Variable<T>(name, kVariableModeAsync),  in AsyncCopyVariable()
181   void SetValue(const T& new_value) {  in SetValue()
198   const T* GetValue(base::TimeDelta /* timeout */,  in GetValue()
205     return new T(value_);  in GetValue()
213   T value_;