std::unwrap_ref_decay< _Tp >

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                                                    libstdc++                 std::unwrap_ref_decay<_Tp>(3cxx)

template<typename_Tp>
       struct std::unwrap_ref_decay< _Tp >"Decay type and if it's a reference_wrapper, unwrap it

       Since
           C++20

       std::unwrap_ref_decay< _Tp >

       #include <type_traits>

   PublicTypesusingtype = unwrap_reference_t< decay_t< _Tp > >