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7adcbafe | 1 | // Copyright (C) 2021-2022 Free Software Foundation, Inc. |
a49a045b 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++20" } | |
19 | // { dg-do compile { target c++20 } } | |
20 | ||
21 | // PR libstdc++/100768 - Range iterator operations should be function objects | |
22 | ||
23 | #include <iterator> | |
24 | #include <ranges> | |
25 | ||
26 | namespace ns1 | |
27 | { | |
28 | struct R { }; | |
29 | void check_adl(R) { } | |
30 | } | |
31 | ||
32 | namespace ns2 | |
33 | { | |
34 | using ns1::R; | |
35 | ||
36 | struct A { }; | |
37 | ||
38 | template<typename I> | |
39 | R advance(I, ...) { return R{}; } | |
40 | ||
41 | template<typename I> | |
42 | R distance(I, ...) { return R{}; } | |
43 | ||
44 | template<typename I> | |
45 | R next(I, ...) { return R{}; } | |
46 | ||
47 | template<typename I> | |
48 | R prev(I, ...) { return R{}; } | |
49 | } | |
50 | ||
51 | template<typename T, typename U> struct associated { }; | |
52 | ||
53 | void | |
54 | test02() | |
55 | { | |
56 | // This type has both ns2 and std::ranges as associated namespaces. | |
57 | using X = associated<ns2::A, std::ranges::dangling>; | |
58 | ||
59 | X range[1]; | |
60 | X* iter = range; | |
61 | X* const sentinel = iter + 1; | |
62 | ||
63 | // [range.iter.op.general] p2 says: "The function templates defined in | |
64 | // [range.iter.ops] are not found by argument-dependent name lookup." | |
65 | // | |
66 | // If we do not meet that requirement then the following will find those | |
67 | // function templates (because std::ranges is an associated namespace), | |
68 | // and the calls to check_adl will be ill-formed. | |
69 | check_adl( advance(iter, 1) ); | |
70 | check_adl( advance(iter, 1, sentinel) ); | |
71 | check_adl( distance(iter, sentinel) ); | |
72 | check_adl( distance(range) ); | |
73 | check_adl( next(iter) ); | |
74 | check_adl( next(iter, 1) ); | |
75 | check_adl( next(iter, sentinel) ); | |
76 | check_adl( next(iter, 1, sentinel) ); | |
77 | check_adl( prev(iter) ); | |
78 | check_adl( prev(iter, 1) ); | |
79 | check_adl( prev(iter, 1, sentinel) ); | |
80 | } | |
81 | ||
82 | namespace ns3 | |
83 | { | |
84 | struct A { }; | |
85 | ||
86 | void advance(A*, int) = delete; | |
87 | void advance(A*, int, A*) = delete; | |
88 | ||
89 | void distance(A*, A*) = delete; | |
90 | void distance(A(&)[1]) = delete; | |
91 | ||
92 | void next(A*) = delete; | |
93 | void next(A*, int) = delete; | |
94 | void next(A*, A*) = delete; | |
95 | void next(A*, int, A*) = delete; | |
96 | ||
97 | void prev(A*) = delete; | |
98 | void prev(A*, int) = delete; | |
99 | void prev(A*, int, A*) = delete; | |
100 | } | |
101 | ||
102 | void | |
103 | test01() | |
104 | { | |
105 | ns3::A range[1]; | |
106 | ns3::A* iter = range; | |
107 | ns3::A* const sentinel = iter + 1; | |
108 | ||
109 | // [range.iter.op.general] p2 also says: "When found by unqualified name | |
110 | // lookup for the postfix-expression in a function call, they inhibit | |
111 | // argument-dependent name lookup." | |
112 | // | |
113 | // If we do not meet that requirement then the following will find the | |
114 | // deleted overloads in namespace ns3 (because it is an associated namespace | |
115 | // and those functions are exact matches for the arguments). | |
116 | using namespace std::ranges; | |
240b01b0 JW |
117 | (void) advance(iter, 1); |
118 | (void) advance(iter, 3, sentinel); | |
119 | (void) distance(iter, sentinel); | |
120 | (void) distance(range); | |
121 | (void) next(iter); | |
122 | (void) next(iter, -1); | |
123 | (void) next(iter, sentinel); | |
124 | (void) next(iter, 5, sentinel); | |
125 | (void) prev(iter); | |
126 | (void) prev(iter, 0); | |
127 | (void) prev(iter, 0, sentinel); | |
a49a045b | 128 | } |