| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14 |
| |
| // <optional> |
| |
| // template<class T> |
| // optional(T) -> optional<T>; |
| |
| #include <optional> |
| #include <cassert> |
| |
| struct A {}; |
| |
| int main(int, char**) |
| { |
| // Test the explicit deduction guides |
| |
| // Test the implicit deduction guides |
| { |
| // optional() |
| std::optional opt; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'optional'}} |
| } |
| |
| { |
| // optional(nullopt_t) |
| std::optional opt(std::nullopt); // expected-error-re@optional:* {{{{(static_assert|static assertion)}} failed{{.*}}instantiation of optional with nullopt_t is ill-formed}} |
| } |
| |
| return 0; |
| } |
