is_handle.h

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#ifndef canvas_Persistency_Common_detail_is_handle_h
#define canvas_Persistency_Common_detail_is_handle_h

#include "cetlib/metaprogramming.h"

#include <type_traits>

namespace art {
  namespace detail {
    template <class T, class Enable = void>
    struct is_handle : std::false_type {
    };

    template <class T>
    struct is_handle<T, cet::enable_if_type_exists_t<typename T::HandleTag>>
      : std::true_type {
    };

    template <class T, class U>
    struct are_handles {
      static constexpr bool value{detail::is_handle<T>::value &&
                                  detail::is_handle<U>::value};
    };
  }
}
#endif /* canvas_Persistency_Common_detail_is_handle_h */

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