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83ffe9cd | 1 | // Copyright (C) 2019-2023 Free Software Foundation, Inc. |
990a09e4 JW |
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 <iterator> | |
22 | ||
23 | template<typename T> | |
24 | using PI = std::projected<T, std::identity>; | |
25 | ||
26 | static_assert(std::same_as<PI<int*>::value_type, int>); | |
27 | static_assert(std::same_as<decltype(*std::declval<const PI<int*>&>()), int&>); | |
28 | ||
29 | struct X | |
30 | { | |
31 | using value_type = char*; | |
c8dd2446 | 32 | char* const& operator*() const; |
990a09e4 | 33 | }; |
c8dd2446 JW |
34 | static_assert( std::indirectly_readable<X> ); |
35 | static_assert( std::indirectly_readable<X&> ); | |
36 | static_assert( std::indirectly_readable<const X> ); | |
990a09e4 JW |
37 | static_assert(std::same_as<PI<X>::value_type, char*>); |
38 | static_assert(std::same_as<decltype(*std::declval<PI<X>&>()), char* const&>); | |
39 | ||
40 | struct Y; | |
41 | using PY = std::projected<const Y*, int Y::*>; | |
42 | static_assert(std::same_as<PY::value_type, int>); | |
43 | static_assert(std::same_as<decltype(*std::declval<PY&>()), const int&>); |