optional_const_nullopt_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) null_opt_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::nullopt_t; 22 using std::experimental::nullopt; 23 24 optional<const nullopt_t> opt; 25#else 26#error 27#endif // _LIBCPP_STD_VER > 11 28} 29