47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
// { dg-options "-std=gnu++17" }
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// { dg-do compile { target c++17 } }
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// Copyright (C) 2013-2020 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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#include <optional>
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#include <testsuite_hooks.h>
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int main()
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{
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// [20.5.6] Disengaged state indicator
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static_assert( std::is_same<decltype(std::nullopt), const std::nullopt_t>(), "" );
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static_assert( std::is_empty<std::nullopt_t>(), "" );
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static_assert( std::is_literal_type<std::nullopt_t>(), "" );
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static_assert( !std::is_default_constructible<std::nullopt_t>(), "" );
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{
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constexpr std::optional<int> o = std::nullopt;
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static_assert( !o, "" );
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}
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{
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constexpr std::optional<int> o = { std::nullopt };
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static_assert( !o, "" );
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}
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{
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constexpr std::optional<int> o { std::nullopt };
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static_assert( !o, "" );
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}
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}
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