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