1 // Copyright (C) 2020-2021 Free Software Foundation, Inc. 2 // 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) 7 // any later version. 8 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. 13 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/>. 17 18 // { dg-options "-std=gnu++2a" } 19 // { dg-do compile { target c++2a } } 20 21 #include <ranges> 22 23 using S1 = std::ranges::subrange<int*>; 24 using S2 = std::ranges::subrange<long*, void*>; 25 26 static_assert( std::tuple_size_v<S1> == 2 ); 27 static_assert( std::tuple_size_v<S2> == 2 ); 28 29 static_assert( std::same_as<std::tuple_element_t<0, S1>, int*> ); 30 static_assert( std::same_as<std::tuple_element_t<1, S1>, int*> ); 31 // LWG 3398 32 static_assert( std::same_as<std::tuple_element_t<0, const S1>, int*> ); 33 static_assert( std::same_as<std::tuple_element_t<1, const S1>, int*> ); 34 35 static_assert( std::same_as<std::tuple_element_t<0, S2>, long*> ); 36 static_assert( std::same_as<std::tuple_element_t<1, S2>, void*> ); 37 // LWG 3398 38 static_assert( std::same_as<std::tuple_element_t<0, const S2>, long*> ); 39 static_assert( std::same_as<std::tuple_element_t<1, const S2>, void*> ); 40 41 S1 s1; 42 static_assert( std::same_as<decltype(std::get<0>(s1)), int*> ); 43 static_assert( std::same_as<decltype(std::get<1>(s1)), int*> ); 44 const S1 c1; 45 static_assert( std::same_as<decltype(std::get<0>(c1)), int*> ); 46 static_assert( std::same_as<decltype(std::get<1>(c1)), int*> ); 47 S2 s2; 48 static_assert( std::same_as<decltype(std::get<0>(s2)), long*> ); 49 static_assert( std::same_as<decltype(std::get<1>(s2)), void*> ); 50 const S2 c2; 51 static_assert( std::same_as<decltype(std::get<0>(c2)), long*> ); 52 static_assert( std::same_as<decltype(std::get<1>(c2)), void*> ); 53