| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // UNSUPPORTED: c++03, c++11, c++14 |
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| 10 | |
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| 11 | // <optional> |
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| 12 | |
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| 13 | // template<class T> |
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| 14 | // optional(T) -> optional<T>; |
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| 15 | |
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| 16 | #include <optional> |
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| 17 | #include <cassert> |
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| 18 | |
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| 19 | struct A {}; |
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| 20 | |
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| 21 | int main(int, char**) |
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| 22 | { |
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| 23 | // Test the explicit deduction guides |
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| 24 | |
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| 25 | // Test the implicit deduction guides |
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| 26 | { |
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| 27 | // optional() |
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| 28 | std::optional opt; // expected-error {{no viable constructor or deduction guide for deduction of template arguments of 'optional'}} |
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| 29 | } |
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| 30 | |
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| 31 | { |
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| 32 | // optional(nullopt_t) |
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| 33 | std::optional opt(std::nullopt); // expected-error-re@optional:* {{static assertion failed{{.*}}instantiation of optional with nullopt_t is ill-formed}} |
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| 34 | } |
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| 35 | |
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| 36 | return 0; |
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| 37 | } |
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| 38 | |
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