33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
// { dg-options "-std=gnu++11" }
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// { dg-do compile }
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// Copyright (C) 2012-2016 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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//
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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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//
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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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#include <type_traits>
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#include <functional>
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class S{}; // No hash specialization
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template<class T>
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auto f(int) -> decltype(std::hash<T>(), std::true_type());
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template<class T>
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auto f(...) -> decltype(std::false_type());
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static_assert(!decltype(f<S>(0))::value, "");
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