mirror of git://gcc.gnu.org/git/gcc.git
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
// Copyright (C) 2017-2018 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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// { dg-options "-std=gnu++17" }
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// { dg-do compile { target c++17 } }
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#include <optional>
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#include <type_traits>
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struct MoveOnly
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{
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MoveOnly() = default;
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MoveOnly(MoveOnly&&);
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MoveOnly& operator=(MoveOnly&&);
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};
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int main()
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{
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std::optional x = 5;
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static_assert(std::is_same_v<decltype(x), std::optional<int>>);
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int y = 42;
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std::optional x2 = y;
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static_assert(std::is_same_v<decltype(x2), std::optional<int>>);
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const int z = 666;
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std::optional x3 = z;
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static_assert(std::is_same_v<decltype(x3), std::optional<int>>);
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std::optional mo = MoveOnly();
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static_assert(std::is_same_v<decltype(mo), std::optional<MoveOnly>>);
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mo = MoveOnly();
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std::optional copy = x;
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static_assert(std::is_same_v<decltype(copy), std::optional<int>>);
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std::optional move = std::move(mo);
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static_assert(std::is_same_v<decltype(move), std::optional<MoveOnly>>);
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}
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