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1 | // { dg-do run { target c++11 } } |
2 | ||
8d9254fc | 3 | // Copyright (C) 2016-2020 Free Software Foundation, Inc. |
a7da4881 VV |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING3. If not see | |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | // 27.6.2.5.3 basic_ostream manipulator inserters | |
21 | ||
22 | #include <sstream> | |
23 | ||
24 | struct X {}; | |
25 | std::istream& operator>>(std::istream&, X&) = delete; | |
26 | ||
27 | struct Y {}; | |
28 | std::istream& operator>>(std::istream& is, Y&) {return is;} | |
29 | std::istream& operator>>(std::istream& is, Y&&) {return is;} | |
30 | ||
31 | struct Z{}; | |
32 | ||
33 | template <class T> | |
34 | auto f(T&&) -> decltype(void(std::declval<std::istream&>() | |
35 | >> std::declval<T&&>()), | |
36 | std::true_type()); | |
37 | ||
38 | std::false_type f(...); | |
39 | ||
40 | template <class T> | |
41 | auto g(T&&) -> decltype(void(std::declval<std::istream&&>() | |
42 | >> std::declval<T&&>()), | |
43 | std::true_type()); | |
44 | ||
45 | std::false_type g(...); | |
46 | ||
47 | void test01() | |
48 | { | |
49 | Y y; | |
50 | std::istringstream is; | |
51 | is >> y; | |
52 | is >> Y(); | |
53 | std::istringstream() >> y; | |
54 | std::istringstream() >> Y(); | |
55 | static_assert(!std::__is_extractable<std::istream&, X&>::value, ""); | |
56 | static_assert(!std::__is_extractable<std::istream&&, X&>::value, ""); | |
57 | static_assert(!std::__is_extractable<std::istream&, X&&>::value, ""); | |
58 | static_assert(!std::__is_extractable<std::istream&&, X&&>::value, ""); | |
59 | static_assert(std::__is_extractable<std::istream&, Y&>::value, ""); | |
60 | static_assert(std::__is_extractable<std::istream&&, Y&>::value, ""); | |
61 | static_assert(std::__is_extractable<std::istream&, Y&&>::value, ""); | |
62 | static_assert(std::__is_extractable<std::istream&&, Y&&>::value, ""); | |
63 | static_assert(!std::__is_extractable<std::istream&, Z&>::value, ""); | |
64 | static_assert(!std::__is_extractable<std::istream&&, Z&>::value, ""); | |
65 | static_assert(!std::__is_extractable<std::istream&, Z&&>::value, ""); | |
66 | static_assert(!std::__is_extractable<std::istream&&, Z&&>::value, ""); | |
67 | static_assert(std::is_same<decltype(f(std::declval<X&>())), | |
68 | std::false_type>::value, ""); | |
69 | static_assert(std::is_same<decltype(f(std::declval<X&&>())), | |
70 | std::false_type>::value, ""); | |
71 | static_assert(std::is_same<decltype(f(std::declval<Y&>())), | |
72 | std::true_type>::value, ""); | |
73 | static_assert(std::is_same<decltype(f(std::declval<Y&&>())), | |
74 | std::true_type>::value, ""); | |
75 | static_assert(std::is_same<decltype(f(std::declval<Z&>())), | |
76 | std::false_type>::value, ""); | |
77 | static_assert(std::is_same<decltype(f(std::declval<Z&&>())), | |
78 | std::false_type>::value, ""); | |
79 | static_assert(std::is_same<decltype(g(std::declval<X&>())), | |
80 | std::false_type>::value, ""); | |
81 | static_assert(std::is_same<decltype(g(std::declval<X&&>())), | |
82 | std::false_type>::value, ""); | |
83 | static_assert(std::is_same<decltype(g(std::declval<Y&>())), | |
84 | std::true_type>::value, ""); | |
85 | static_assert(std::is_same<decltype(g(std::declval<Y&&>())), | |
86 | std::true_type>::value, ""); | |
87 | static_assert(std::is_same<decltype(g(std::declval<Z&>())), | |
88 | std::false_type>::value, ""); | |
89 | static_assert(std::is_same<decltype(g(std::declval<Z&&>())), | |
90 | std::false_type>::value, ""); | |
91 | } | |
92 | ||
93 | int main() | |
94 | { | |
95 | test01(); | |
96 | } |