std::_Not_fn< _Fn > - Generalized negator.

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                                                    libstdc++                          std::_Not_fn<_Fn>(3cxx)

template<typename_Fn>
       class std::_Not_fn< _Fn >"Generalized negator.

       std::_Not_fn< _Fn > - Generalized negator.

       #include <functional>

   PublicMemberFunctions
       template<typename_Fn2 > constexpr _Not_fn (_Fn2 &&__fn, int)
       _Not_fn (_Not_fn &&__fn)=default_Not_fn (const _Not_fn &__fn)=defaultPublicAttributes
       template<typename... _Args> constexpr decltype(_S_not< __inv_res_t< _Fn &&, _Args... > >()) operator()
           (_Args &&... __args) &&noexcept(__is_nothrow_invocable< _Fn &&, _Args... >::value &&noexcept(_S_not<
           __inv_res_t< _Fn &&, _Args... > >()))
       template<typename... _Args> constexpr decltype(_S_not< __inv_res_t< _Fn &, _Args... > >()) operator()
           (_Args &&... __args) &noexcept(__is_nothrow_invocable< _Fn &, _Args... >::value &&noexcept(_S_not<
           __inv_res_t< _Fn &, _Args... > >()))
       template<typename... _Args> constexpr decltype(_S_not< __inv_res_t< _Fn const &&, _Args... > >())
           operator() (_Args &&... __args) const &&noexcept(__is_nothrow_invocable< _Fn const &&, _Args...
           >::value &&noexcept(_S_not< __inv_res_t< _Fn const &&, _Args... > >()))
       template<typename... _Args> constexpr decltype(_S_not< __inv_res_t< _Fn const &, _Args... > >())
           operator() (_Args &&... __args) const &noexcept(__is_nothrow_invocable< _Fn const &, _Args...
           >::value &&noexcept(_S_not< __inv_res_t< _Fn const &, _Args... > >()))