bb54e0b879
We already defined the traits in <type_traits> as now required by LWG 3348, but the macro was missing. This adds it. * include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348). * include/std/version (__cpp_lib_unwrap_ref): Likewise. * testsuite/20_util/unwrap_reference/1.cc: Check macro. * testsuite/20_util/unwrap_reference/3.cc: New test.
28 lines
1.0 KiB
C++
28 lines
1.0 KiB
C++
// Copyright (C) 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++2a" }
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// { dg-do compile { target c++2a } }
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#include <version>
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#ifndef __cpp_lib_unwrap_ref
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# error "Feature-test macro for unwrap_reference missing in <version>"
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#elif __cpp_lib_unwrap_ref != 201811L
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# error "Feature-test macro for unwrap_reference has wrong value in <version>"
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#endif
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