std::experimental::_Has_addressof< _Tp > - Trait that detects the presence of an overloaded unary

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libstdc++                                        Tue Jul 19 2022  std::experimental::_Has_addressof<_Tp>(3cxx)

template<typename_Tp>
       struct std::experimental::_Has_addressof< _Tp >" Trait that detects the presence of an overloaded unary
       operator&.

       Practically speaking this detects the presence of such an operator when called on a const-qualified
       lvalue (e.g. declval<const _Tp&>().operator&()).

       Definition at line 162 of file optional.

       std::experimental::_Has_addressof< _Tp > - Trait that detects the presence of an overloaded unary
       operator&.

       Inherits std::__or_<... >::type.