| // { dg-do compile { target c++17 } } |
| |
| // Copyright (C) 2017-2021 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/>. |
| |
| #include <string> |
| |
| template<typename CT> |
| constexpr bool |
| test_assign() |
| { |
| using char_type = typename CT::char_type; |
| char_type s1[2] = {}; |
| const char_type s2[2] = {1, 0}; |
| CT::assign(s1[0], s2[0]); |
| return s1[0] == char_type{1}; |
| } |
| |
| template<typename CT> |
| constexpr bool |
| test_compare() |
| { |
| using char_type = typename CT::char_type; |
| const char_type s1[3] = {1, 2, 3}; |
| const char_type s2[3] = {1, 2, 3}; |
| if (CT::compare(s1, s2, 3) != 0) |
| return false; |
| if (CT::compare(s2, s1, 3) != 0) |
| return false; |
| if (CT::compare(s1+1, s2, 2) <= 0) |
| return false; |
| return true; |
| } |
| |
| template<typename CT> |
| constexpr bool |
| test_length() |
| { |
| using char_type = typename CT::char_type; |
| const char_type s1[4] = {1, 2, 3, 0}; |
| if (CT::length(s1) != 3) |
| return false; |
| if (CT::length(s1+1) != 2) |
| return false; |
| return true; |
| } |
| |
| template<typename CT> |
| constexpr bool |
| test_find() |
| { |
| using char_type = typename CT::char_type; |
| const char_type s1[3] = {1, 2, 3}; |
| if (CT::find(s1, 3, char_type{2}) != s1+1) |
| return false; |
| if (CT::find(s1, 3, char_type{4}) != nullptr) |
| return false; |
| return true; |
| } |
| |
| #ifndef __cpp_lib_constexpr_string |
| # error Feature-test macro for constexpr char_traits is missing |
| #elif __cpp_lib_constexpr_string < (__cplusplus == 201703 ? 201611 : 201811) |
| # error Feature-test macro for constexpr char_traits has the wrong value |
| #endif |
| |
| // We also provide this non-standard macro for P0426R1 (and P1032R1 in C++20). |
| #ifndef __cpp_lib_constexpr_char_traits |
| # error Feature-test macro for constexpr char_traits is missing |
| #elif __cpp_lib_constexpr_char_traits != (__cplusplus == 201703 ? 201611 : 201811) |
| # error Feature-test macro for constexpr char_traits has the wrong value |
| #endif |
| |
| static_assert( test_assign<std::char_traits<char>>() ); |
| static_assert( test_compare<std::char_traits<char>>() ); |
| static_assert( test_length<std::char_traits<char>>() ); |
| static_assert( test_find<std::char_traits<char>>() ); |
| #ifdef _GLIBCXX_USE_WCHAR_T |
| static_assert( test_assign<std::char_traits<wchar_t>>() ); |
| static_assert( test_compare<std::char_traits<wchar_t>>() ); |
| static_assert( test_length<std::char_traits<wchar_t>>() ); |
| static_assert( test_find<std::char_traits<wchar_t>>() ); |
| #endif |
| #ifdef _GLIBCXX_USE_CHAR8_T |
| static_assert( test_assign<std::char_traits<char8_t>>() ); |
| static_assert( test_compare<std::char_traits<char8_t>>() ); |
| static_assert( test_length<std::char_traits<char8_t>>() ); |
| static_assert( test_find<std::char_traits<char8_t>>() ); |
| #endif |
| static_assert( test_assign<std::char_traits<char16_t>>() ); |
| static_assert( test_compare<std::char_traits<char16_t>>() ); |
| static_assert( test_length<std::char_traits<char16_t>>() ); |
| static_assert( test_find<std::char_traits<char16_t>>() ); |
| static_assert( test_assign<std::char_traits<char32_t>>() ); |
| static_assert( test_compare<std::char_traits<char32_t>>() ); |
| static_assert( test_length<std::char_traits<char32_t>>() ); |
| static_assert( test_find<std::char_traits<char32_t>>() ); |
| |
| struct C { unsigned char c; }; |
| constexpr bool operator==(const C& c1, const C& c2) { return c1.c == c2.c; } |
| constexpr bool operator<(const C& c1, const C& c2) { return c1.c < c2.c; } |
| static_assert( test_assign<std::char_traits<C>>() ); |
| static_assert( test_compare<std::char_traits<C>>() ); |
| static_assert( test_length<std::char_traits<C>>() ); |
| static_assert( test_find<std::char_traits<C>>() ); |