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 // <utility>
11
12 // template<class T, T... I>
13 // struct integer_sequence
14 // {
15 // typedef T type;
16 //
17 // static constexpr size_t size() noexcept;
18 // };
19
20 // This test is a conforming extension. The extension turns undefined behavior
21 // into a compile-time error.
22
23 #include <utility>
24
main()25 int main()
26 {
27 #if _LIBCPP_STD_VER > 11
28
29 // Should fail to compile, since float is not an integral type
30 using floatmix = std::integer_sequence<float>;
31 floatmix::value_type I;
32
33 #else
34
35 X
36
37 #endif // _LIBCPP_STD_VER > 11
38 }
39