44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
// { dg-do compile { target c++11 } }
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// Copyright (C) 2012-2020 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// libstdc++/53648
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#include <tuple>
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#include <type_traits>
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using std::tuple;
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struct A { };
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template class std::tuple<tuple<>>;
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template class std::tuple<tuple<tuple<>>>;
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template class std::tuple<A, tuple<A, tuple<A, tuple<A>>>>;
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template class std::tuple<tuple<tuple<A, A>, A>, A>;
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// Verify the following QoI properties are preserved
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static_assert( std::is_empty<tuple<>>::value, "tuple<> is empty" );
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static_assert( std::is_empty<tuple<tuple<>>>::value,
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"tuple<tuple<>> is empty" );
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static_assert( sizeof(tuple<char, tuple<>>) == sizeof(char),
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"tuple<> is eligible for EBO" );
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