1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03
10
11// <tuple>
12
13// template <class... Types> class tuple;
14
15// ~tuple();
16
17// C++17 added:
18// The destructor of tuple shall be a trivial destructor
19// if (is_trivially_destructible_v<Types> && ...) is true.
20
21#include <tuple>
22#include <string>
23#include <cassert>
24#include <type_traits>
25
26#include "test_macros.h"
27
28struct TrackDtor {
29 int* count_;
30 constexpr explicit TrackDtor(int* count) : count_(count) {}
31 TEST_CONSTEXPR_CXX14 TrackDtor(TrackDtor&& that) : count_(that.count_) { that.count_ = nullptr; }
32 TEST_CONSTEXPR_CXX20 ~TrackDtor() { if(count_) ++*count_; }
33};
34static_assert(!std::is_trivially_destructible<TrackDtor>::value, "");
35
36static_assert(std::is_trivially_destructible<std::tuple<>>::value, "");
37static_assert(std::is_trivially_destructible<std::tuple<void*>>::value, "");
38static_assert(std::is_trivially_destructible<std::tuple<int, float>>::value, "");
39static_assert(!std::is_trivially_destructible<std::tuple<std::string>>::value, "");
40static_assert(!std::is_trivially_destructible<std::tuple<int, std::string>>::value, "");
41
42TEST_CONSTEXPR_CXX20 bool test() {
43 int count = 0;
44 {
45 std::tuple<TrackDtor> tuple{TrackDtor(&count)};
46 assert(count == 0);
47 }
48 assert(count == 1);
49
50 return true;
51}
52
53int main(int, char**)
54{
55 test();
56#if TEST_STD_VER > 17
57 static_assert(test());
58#endif
59
60 return 0;
61}
62

source code of libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/dtor.pass.cpp