1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // UNSUPPORTED: c++98, c++03
11 // REQUIRES: diagnose-if-support, verify-support
12
13 // Test that libc++ generates a warning diagnostic when the container is
14 // provided a non-const callable comparator.
15
16 #include <set>
17 #include <map>
18
19 struct BadCompare {
20 template <class T, class U>
operator ()BadCompare21 bool operator()(T const& t, U const& u) {
22 return t < u;
23 }
24 };
25
main()26 int main() {
27 static_assert(!std::__invokable<BadCompare const&, int const&, int const&>::value, "");
28 static_assert(std::__invokable<BadCompare&, int const&, int const&>::value, "");
29
30 // expected-warning@set:* 2 {{the specified comparator type does not provide a const call operator}}
31 // expected-warning@map:* 2 {{the specified comparator type does not provide a const call operator}}
32 {
33 using C = std::set<int, BadCompare>;
34 C s;
35 }
36 {
37 using C = std::multiset<long, BadCompare>;
38 C s;
39 }
40 {
41 using C = std::map<int, int, BadCompare>;
42 C s;
43 }
44 {
45 using C = std::multimap<long, int, BadCompare>;
46 C s;
47 }
48 }
49