| 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: no-threads |
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| 10 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 11 | // XFAIL: availability-synchronization_library-missing |
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| 12 | |
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| 13 | // void swap(jthread& x) noexcept; |
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| 14 | |
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| 15 | #include <cassert> |
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| 16 | #include <thread> |
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| 17 | #include <type_traits> |
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| 18 | |
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| 19 | #include "make_test_thread.h" |
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| 20 | #include "test_macros.h" |
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| 21 | |
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| 22 | template <class T> |
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| 23 | concept IsMemberSwapNoexcept = requires(T& a, T& b) { |
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| 24 | { a.swap(b) } noexcept; |
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| 25 | }; |
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| 26 | |
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| 27 | static_assert(IsMemberSwapNoexcept<std::jthread>); |
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| 28 | |
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| 29 | int main(int, char**) { |
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| 30 | // this is default constructed |
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| 31 | { |
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| 32 | std::jthread t1; |
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| 33 | std::jthread t2 = support::make_test_jthread([] {}); |
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| 34 | const auto originalId2 = t2.get_id(); |
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| 35 | t1.swap(t&: t2); |
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| 36 | |
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| 37 | assert(t1.get_id() == originalId2); |
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| 38 | assert(t2.get_id() == std::jthread::id()); |
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| 39 | } |
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| 40 | |
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| 41 | // that is default constructed |
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| 42 | { |
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| 43 | std::jthread t1 = support::make_test_jthread([] {}); |
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| 44 | std::jthread t2{}; |
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| 45 | const auto originalId1 = t1.get_id(); |
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| 46 | t1.swap(t&: t2); |
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| 47 | |
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| 48 | assert(t1.get_id() == std::jthread::id()); |
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| 49 | assert(t2.get_id() == originalId1); |
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| 50 | } |
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| 51 | |
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| 52 | // both not default constructed |
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| 53 | { |
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| 54 | std::jthread t1 = support::make_test_jthread([] {}); |
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| 55 | std::jthread t2 = support::make_test_jthread([] {}); |
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| 56 | const auto originalId1 = t1.get_id(); |
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| 57 | const auto originalId2 = t2.get_id(); |
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| 58 | t1.swap(t&: t2); |
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| 59 | |
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| 60 | assert(t1.get_id() == originalId2); |
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| 61 | assert(t2.get_id() == originalId1); |
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| 62 | } |
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| 63 | |
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| 64 | // both default constructed |
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| 65 | { |
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| 66 | std::jthread t1; |
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| 67 | std::jthread t2; |
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| 68 | t1.swap(t&: t2); |
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| 69 | |
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| 70 | assert(t1.get_id() == std::jthread::id()); |
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| 71 | assert(t2.get_id() == std::jthread::id()); |
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| 72 | } |
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| 73 | |
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| 74 | return 0; |
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| 75 | } |
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| 76 | |
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