fromFutureImport.h

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#ifndef LARCOREALG_COREUTILS_FROMFUTUREIMPORT_H
#define LARCOREALG_COREUTILS_FROMFUTUREIMPORT_H

#include <utility> // std::forward()

namespace util::pre_std {

#if (__cplusplus < 202000L) // still to be defined, should be C++20

  struct identity {

    struct is_transparent {}; // STL algorithms will be happy to find this

    template <typename T>
    constexpr T&& operator()(T&& t) const noexcept
    {
      return std::forward<T>(t);
    }

  }; // identity<>

#endif // (__cplusplus < 202000L)

} // namespace pre_std

#endif // LARCOREALG_COREUTILS_FROMFUTUREIMPORT_H