| 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 | // <optional> |
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| 11 | |
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| 12 | // constexpr T& optional<T>::operator*() &; |
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| 13 | |
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| 14 | #include <optional> |
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| 15 | #include <type_traits> |
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| 16 | #include <cassert> |
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| 17 | |
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| 18 | #include "test_macros.h" |
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| 19 | |
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| 20 | using std::optional; |
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| 21 | |
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| 22 | struct X |
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| 23 | { |
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| 24 | constexpr int test() const& {return 3;} |
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| 25 | int test() & {return 4;} |
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| 26 | constexpr int test() const&& {return 5;} |
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| 27 | int test() && {return 6;} |
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| 28 | }; |
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| 29 | |
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| 30 | struct Y |
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| 31 | { |
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| 32 | constexpr int test() {return 7;} |
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| 33 | }; |
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| 34 | |
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| 35 | constexpr int |
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| 36 | test() |
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| 37 | { |
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| 38 | optional<Y> opt{Y{}}; |
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| 39 | return (*opt).test(); |
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| 40 | } |
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| 41 | |
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| 42 | int main(int, char**) |
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| 43 | { |
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| 44 | { |
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| 45 | optional<X> opt; ((void)opt); |
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| 46 | ASSERT_SAME_TYPE(decltype(*opt), X&); |
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| 47 | LIBCPP_STATIC_ASSERT(noexcept(*opt)); |
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| 48 | // ASSERT_NOT_NOEXCEPT(*opt); |
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| 49 | // FIXME: This assertion fails with GCC because it can see that |
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| 50 | // (A) operator*() is constexpr, and |
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| 51 | // (B) there is no path through the function that throws. |
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| 52 | // It's arguable if this is the correct behavior for the noexcept |
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| 53 | // operator. |
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| 54 | // Regardless this function should still be noexcept(false) because |
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| 55 | // it has a narrow contract. |
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| 56 | } |
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| 57 | { |
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| 58 | optional<X> opt(X{}); |
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| 59 | assert((*opt).test() == 4); |
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| 60 | } |
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| 61 | static_assert(test() == 7, "" ); |
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| 62 | |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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