62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03
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// <tuple>
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// template <class... Types> class tuple;
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// ~tuple();
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// C++17 added:
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// The destructor of tuple shall be a trivial destructor
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// if (is_trivially_destructible_v<Types> && ...) is true.
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#include <tuple>
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#include <string>
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#include <cassert>
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#include <type_traits>
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#include "test_macros.h"
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struct TrackDtor {
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int* count_;
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constexpr explicit TrackDtor(int* count) : count_(count) {}
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TEST_CONSTEXPR_CXX14 TrackDtor(TrackDtor&& that) : count_(that.count_) { that.count_ = nullptr; }
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TEST_CONSTEXPR_CXX20 ~TrackDtor() { if(count_) ++*count_; }
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};
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static_assert(!std::is_trivially_destructible<TrackDtor>::value, "");
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static_assert(std::is_trivially_destructible<std::tuple<>>::value, "");
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static_assert(std::is_trivially_destructible<std::tuple<void*>>::value, "");
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static_assert(std::is_trivially_destructible<std::tuple<int, float>>::value, "");
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static_assert(!std::is_trivially_destructible<std::tuple<std::string>>::value, "");
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static_assert(!std::is_trivially_destructible<std::tuple<int, std::string>>::value, "");
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TEST_CONSTEXPR_CXX20 bool test() {
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int count = 0;
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{
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std::tuple<TrackDtor> tuple{TrackDtor(&count)};
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assert(count == 0);
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}
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assert(count == 1);
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return true;
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}
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int main(int, char**)
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{
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test();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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