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// <tuple>
10
11// template <class... Types> class tuple;
12
13// template <class Alloc, class... UTypes>
14// constexpr // since c++20
15// tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&);
16
17// UNSUPPORTED: c++03
18
19#include <tuple>
20#include <memory>
21#include <cassert>
22
23#include "test_macros.h"
24#include "allocators.h"
25#include "test_allocator.h"
26#include "../alloc_first.h"
27#include "../alloc_last.h"
28
29struct Explicit {
30 int value;
31 explicit Explicit(int x) : value(x) {}
32};
33
34struct Implicit {
35 int value;
36 Implicit(int x) : value(x) {}
37};
38
39#if TEST_STD_VER > 17
40constexpr bool alloc_copy_constructor_is_constexpr() {
41 const std::tuple<int> t1 = 1;
42 std::tuple<int> t2 = {std::allocator_arg, test_allocator<int>{}, t1};
43 assert(std::get<0>(t2) == 1);
44 return true;
45}
46#endif
47
48int main(int, char**)
49{
50 {
51 typedef std::tuple<long> T0;
52 typedef std::tuple<long long> T1;
53 T0 t0(2);
54 T1 t1(std::allocator_arg, A1<int>(), t0);
55 assert(std::get<0>(t1) == 2);
56 }
57 {
58 typedef std::tuple<int> T0;
59 typedef std::tuple<alloc_first> T1;
60 T0 t0(2);
61 alloc_first::allocator_constructed = false;
62 T1 t1(std::allocator_arg, A1<int>(5), t0);
63 assert(alloc_first::allocator_constructed);
64 assert(std::get<0>(t1) == 2);
65 }
66 {
67 typedef std::tuple<int, int> T0;
68 typedef std::tuple<alloc_first, alloc_last> T1;
69 T0 t0(2, 3);
70 alloc_first::allocator_constructed = false;
71 alloc_last::allocator_constructed = false;
72 T1 t1(std::allocator_arg, A1<int>(5), t0);
73 assert(alloc_first::allocator_constructed);
74 assert(alloc_last::allocator_constructed);
75 assert(std::get<0>(t1) == 2);
76 assert(std::get<1>(t1) == 3);
77 }
78 {
79 typedef std::tuple<long, int, int> T0;
80 typedef std::tuple<long long, alloc_first, alloc_last> T1;
81 T0 t0(1, 2, 3);
82 alloc_first::allocator_constructed = false;
83 alloc_last::allocator_constructed = false;
84 T1 t1(std::allocator_arg, A1<int>(5), t0);
85 assert(alloc_first::allocator_constructed);
86 assert(alloc_last::allocator_constructed);
87 assert(std::get<0>(t1) == 1);
88 assert(std::get<1>(t1) == 2);
89 assert(std::get<2>(t1) == 3);
90 }
91 {
92 const std::tuple<int> t1(42);
93 std::tuple<Explicit> t2{std::allocator_arg, std::allocator<int>{}, t1};
94 assert(std::get<0>(t2).value == 42);
95 }
96 {
97 const std::tuple<int> t1(42);
98 std::tuple<Implicit> t2 = {std::allocator_arg, std::allocator<int>{}, t1};
99 assert(std::get<0>(t2).value == 42);
100 }
101 {
102 // Test that we can use a tag derived from allocator_arg_t
103 struct DerivedFromAllocatorArgT : std::allocator_arg_t { };
104 DerivedFromAllocatorArgT derived;
105 std::tuple<long> from(3l);
106 std::tuple<long long> t0(derived, A1<int>(), from);
107 }
108
109#if TEST_STD_VER > 17
110 static_assert(alloc_copy_constructor_is_constexpr());
111#endif
112 return 0;
113}
114

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