36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
// Copyright (C) 2019-2022 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 <span>
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constexpr bool
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test01(bool b)
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{
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std::span<int, 0> s;
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if (b || !s.empty())
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s.front();
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return true;
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}
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static_assert(test01(false));
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static_assert(test01(true)); // { dg-error "non-constant" }
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// { dg-error "unreachable" "" { target *-*-* } 0 }
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// { dg-prune-output "in 'constexpr' expansion" }
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