35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
// Copyright (C) 2016-2018 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-do compile { target c++11 } }
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// NB: Don't include any other headers in this file.
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// LWG 2192 requires <cstdlib> to declare overloads for floating point types.
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#include <cstdlib>
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template<typename, typename> struct is_same { enum { value = 0 }; };
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template<typename T> struct is_same<T, T> { enum { value = 1 }; };
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template<typename T>
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constexpr bool check(T val) {
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return is_same<decltype(std::abs(val)), T>::value;
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}
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static_assert( check(1.f), "abs(1.f) returns float" );
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static_assert( check(1.), "abs(1.) returns double" );
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static_assert( check(1.l), "abs(1.l) returns long double" );
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