optional_const_in_place_t.fail.cpp revision 0cdbe6048173c1f05628dbc85430acf191a3e173 
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// <optional>
11
12// A program that necessitates the instantiation of template optional for
13// (possibly cv-qualified) in_place_t is ill-formed.
14
15#include <experimental/optional>
16
17int main()
18{
19#if _LIBCPP_STD_VER > 11
20    using std::experimental::optional;
21    using std::experimental::in_place_t;
22    using std::experimental::in_place;
23
24    optional<const in_place_t> opt;
25#else
26#error
27#endif  // _LIBCPP_STD_VER > 11
28}
29