libstdc++-v3/testsuite/20_util/tuple/60497.cc

// { dg-do compile { target c++14 } }

// Copyright (C) 2014-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// libstdc++/60497

#include <tuple>

struct A;
template<typename T> struct B { T t; };

using element_type = B<A>*;
using tuple_type = std::tuple<element_type>;

tuple_type t;
const tuple_type ct;

auto a = std::get<0>(t);
auto b = std::get<0>(ct);
auto c = std::get<element_type>(t);
auto d = std::get<element_type>(ct);

// same again for rvalues
auto e = std::get<0>(std::move(t));
auto f = std::get<0>(std::move(ct));
auto g = std::get<element_type>(std::move(t));
auto h = std::get<element_type>(std::move(ct));