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- // Copyright (C) 2017-2022 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the
- // terms of the GNU General Public License as published by the
- // Free Software Foundation; either version 3, or (at your option)
- // any later version.
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // You should have received a copy of the GNU General Public License along
- // with this library; see the file COPYING3. If not see
- // <http://www.gnu.org/licenses/>.
- // { dg-options "-std=gnu++17" }
- // { dg-do compile { target c++17 } }
- #include <string_view>
- struct constexpr_char_traits : std::char_traits<char>
- {
- static constexpr size_t
- length(const char* val)
- {
- size_t res = 0;
- for (; val[res] != '\0'; ++res)
- ;
- return res;
- }
- static constexpr int
- compare(const char* lhs, const char* rhs, std::size_t count)
- {
- for (size_t pos = 0; pos < count; ++pos)
- {
- if (lhs[pos] != rhs[pos])
- return lhs[pos] - rhs[pos];
- }
- return 0;
- }
- };
- using string_view = std::basic_string_view<char, constexpr_char_traits>;
- constexpr
- string_view get()
- {
- string_view res = "x::";
- string_view start_pattern = "x";
- res = res.substr(res.find(start_pattern) + start_pattern.size());
- res = res.substr(0, res.find_first_of(";]"));
- res = res.substr(res.rfind("::"));
- return res;
- }
- static_assert( get() == get() );
- using std::u16string_view;
- constexpr
- u16string_view get16()
- {
- u16string_view res = u"x::";
- u16string_view start_pattern = u"x";
- res = res.substr(res.find(start_pattern) + start_pattern.size());
- res = res.substr(0, res.find_first_of(u";]"));
- res = res.substr(res.rfind(u"::"));
- return res;
- }
- static_assert( get16() == get16() );
- using std::u32string_view;
- constexpr
- u32string_view get32()
- {
- u32string_view res = U"x::";
- u32string_view start_pattern = U"x";
- res = res.substr(res.find(start_pattern) + start_pattern.size());
- res = res.substr(0, res.find_first_of(U";]"));
- res = res.substr(res.rfind(U"::"));
- return res;
- }
- static_assert( get32() == get32() );
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