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: libcpp-has-no-threads
11 // UNSUPPORTED: c++98, c++03
12
13 // <mutex>
14
15 // template <class ...Mutex> class lock_guard;
16
17 // explicit lock_guard(Mutex&...);
18
19 // MODULES_DEFINES: _LIBCPP_ABI_VARIADIC_LOCK_GUARD
20 #define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
21 #include <mutex>
22
23 template <class LG>
test_conversion(LG)24 void test_conversion(LG) {}
25
main()26 int main()
27 {
28 using M = std::mutex;
29 M m0, m1, m2;
30 M n0, n1, n2;
31 {
32 using LG = std::lock_guard<>;
33 LG lg = {}; // expected-error{{chosen constructor is explicit in copy-initialization}}
34 test_conversion<LG>({}); // expected-error{{no matching function for call}}
35 ((void)lg);
36 }
37 {
38 using LG = std::lock_guard<M, M>;
39 LG lg = {m0, m1}; // expected-error{{chosen constructor is explicit in copy-initialization}}
40 test_conversion<LG>({n0, n1}); // expected-error{{no matching function for call}}
41 ((void)lg);
42 }
43 {
44 using LG = std::lock_guard<M, M, M>;
45 LG lg = {m0, m1, m2}; // expected-error{{chosen constructor is explicit in copy-initialization}}
46 test_conversion<LG>({n0, n1, n2}); // expected-error{{no matching function for call}}
47 }
48 }
49