is_handle.h
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1 #ifndef canvas_Persistency_Common_detail_is_handle_h
2 #define canvas_Persistency_Common_detail_is_handle_h
3 
5 
6 #include <type_traits>
7 
8 namespace art {
9  namespace detail {
10  template <class T, class Enable = void>
11  struct is_handle : std::false_type {};
12 
13  template <class T>
14  struct is_handle<T, std::void_t<typename T::HandleTag>> : std::true_type {};
15 
16  template <class T, class U>
17  struct are_handles {
18  static constexpr bool value{detail::is_handle<T>::value &&
20  };
21  }
22 }
23 #endif /* canvas_Persistency_Common_detail_is_handle_h */
24 
25 // Local Variables:
26 // mode: c++
27 // End:
const XML_Char int const XML_Char * value
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