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git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
1 // Copyright (C) 2020-2024 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++20 } }
19 // { dg-add-options no_pch }
21 #include <string_view>
23 #ifndef __cpp_lib_constexpr_string_view
24 # error "Feature test macro for constexpr copy is missing in <string_view>"
25 #elif __cpp_lib_constexpr_string_view < 201811L
26 # error "Feature test macro for constexpr copy has wrong value in <string_view>"
32 std::string_view s
= "Everything changes and nothing stands still.";
34 auto n
= s
.copy(buf
, 7, 11);
35 return std::string_view(buf
, n
) == "changes";
38 static_assert( test01() );