xref: /llvm-project/libcxx/test/std/containers/associative/set/set.cons/deduct.verify.cpp (revision 9c4a716c1292096fcbdf415b63b7b0122b03310f)
1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14
10 
11 // <set>
12 
13 // template<class InputIterator,
14 //          class Compare = less<iter-value-type<InputIterator>>,
15 //          class Allocator = allocator<iter-value-type<InputIterator>>>
16 // set(InputIterator, InputIterator,
17 //     Compare = Compare(), Allocator = Allocator())
18 //   -> set<iter-value-type<InputIterator>, Compare, Allocator>;
19 // template<class Key, class Compare = less<Key>,
20 //          class Allocator = allocator<Key>>
21 // set(initializer_list<Key>, Compare = Compare(), Allocator = Allocator())
22 //   -> set<Key, Compare, Allocator>;
23 // template<class InputIterator, class Allocator>
24 // set(InputIterator, InputIterator, Allocator)
25 //   -> set<iter-value-type<InputIterator>,
26 //          less<iter-value-type<InputIterator>>, Allocator>;
27 // template<class Key, class Allocator>
28 // set(initializer_list<Key>, Allocator)
29 //   -> set<Key, less<Key>, Allocator>;
30 
31 #include <functional>
32 #include <set>
33 #include <type_traits>
34 
35 struct NotAnAllocator {
operator <(NotAnAllocator,NotAnAllocator)36   friend bool operator<(NotAnAllocator, NotAnAllocator) { return false; }
37 };
38 
main(int,char **)39 int main(int, char **) {
40   {
41     // cannot deduce Key from nothing
42     std::set s;
43     // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}set'}}
44   }
45   {
46     // cannot deduce Key from just (Compare)
47     std::set s(std::less<int>{});
48     // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}set'}}
49   }
50   {
51     // cannot deduce Key from just (Compare, Allocator)
52     std::set s(std::less<int>{}, std::allocator<int>{});
53     // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}set'}}
54   }
55   {
56     // cannot deduce Key from just (Allocator)
57     std::set s(std::allocator<int>{});
58     // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}set'}}
59   }
60   {
61     // since we have parens, not braces, this deliberately does not find the
62     // initializer_list constructor
63     NotAnAllocator a;
64     std::set s(a);
65     // expected-error-re@-1{{no viable constructor or deduction guide for deduction of template arguments of '{{(std::)?}}set'}}
66   }
67 
68   return 0;
69 }
70