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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/20_util/variant/87619.cc
1 // Copyright (C) 2018-2022 Free Software Foundation, Inc.
3 // This file is part of the GNU ISO C++ Library. This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
18 // { dg-do compile { target c++17 } }
19 // FIXME: Need increased timeout due to PR c++/102780
20 // { dg-timeout-factor 2 { target c++20 } }
26 template<std::size_t I
>
30 template <std::size_t... Is
>
31 void f_impl(std::index_sequence
<Is
...>)
33 using V
= std::variant
<S
<Is
>...>;
34 // For a variant of 255 alternatives the valid indices are [0,254]
35 // and index 255 means valueless-by-exception, so fits in one byte.
36 if constexpr (std::variant_size_v
<V
> <=
37 std::numeric_limits
<unsigned char>::max())
38 static_assert(sizeof(V
) == 2);
40 static_assert(sizeof(V
) > 2);
43 template <std::size_t I
>
46 f_impl(std::make_index_sequence
<I
>{});
51 f
<std::numeric_limits
<unsigned char>::max() - 1>();
52 f
<std::numeric_limits
<unsigned char>::max()>();
53 f
<std::numeric_limits
<unsigned char>::max() + 1>();