40 lines
1.5 KiB
C++
40 lines
1.5 KiB
C++
// Copyright (C) 2017-2020 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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// { dg-options "-std=gnu++17" }
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// { dg-do compile { target c++17 } }
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#include <functional>
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// PR libstdc++/83427
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int f(short) noexcept { return 0; }
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std::reference_wrapper<decltype(f)> r(f);
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static_assert(std::is_same_v<decltype(r)::result_type, int>);
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static_assert(std::is_same_v<decltype(r)::argument_type, short>);
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auto* p = &f;
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std::reference_wrapper<decltype(&f)> r2(p);
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static_assert(std::is_same_v<decltype(r2)::result_type, int>);
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static_assert(std::is_same_v<decltype(r2)::argument_type, short>);
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struct X { long f() const & noexcept { return 0L; } };
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auto m = &X::f;
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std::reference_wrapper<decltype(m)> r3(m);
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static_assert(std::is_same_v<decltype(r3)::result_type, long>);
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static_assert(std::is_same_v<decltype(r3)::argument_type, const X*>);
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