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// <list>
10// UNSUPPORTED: c++03, c++11, c++14
11
12// template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
13// list(InputIterator, InputIterator, Allocator = Allocator())
14// -> list<typename iterator_traits<InputIterator>::value_type, Allocator>;
15//
16// template<ranges::input_range R, class Allocator = allocator<ranges::range_value_t<R>>>
17// list(from_range_t, R&&, Allocator = Allocator())
18// -> list<ranges::range_value_t<R>, Allocator>; // C++23
19
20#include <array>
21#include <cassert>
22#include <climits> // INT_MAX
23#include <cstddef>
24#include <iterator>
25#include <list>
26
27#include "deduction_guides_sfinae_checks.h"
28#include "test_macros.h"
29#include "test_iterators.h"
30#include "test_allocator.h"
31
32struct A {};
33
34int main(int, char**) {
35 // Test the explicit deduction guides
36 {
37 const int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
38 std::list lst(std::begin(arr: arr), std::end(arr: arr));
39
40 static_assert(std::is_same_v<decltype(lst), std::list<int>>, "");
41 assert(std::equal(lst.begin(), lst.end(), std::begin(arr), std::end(arr)));
42 }
43
44 {
45 const long arr[] = {INT_MAX, 1L, 2L, 3L};
46 std::list lst(std::begin(arr: arr), std::end(arr: arr), std::allocator<long>());
47 static_assert(std::is_same_v<decltype(lst)::value_type, long>, "");
48 assert(lst.size() == 4);
49 auto it = lst.begin();
50 assert(*it++ == INT_MAX);
51 assert(*it++ == 1L);
52 assert(*it++ == 2L);
53 }
54
55 // Test the implicit deduction guides
56
57 {
58 // We don't expect this one to work.
59 // std::list lst(std::allocator<int>()); // list (allocator &)
60 }
61
62 {
63 std::list lst(1, A{}); // list (size_type, T)
64 static_assert(std::is_same_v<decltype(lst)::value_type, A>, "");
65 static_assert(std::is_same_v<decltype(lst)::allocator_type, std::allocator<A>>, "");
66 assert(lst.size() == 1);
67 }
68
69 {
70 std::list lst(1, A{}, test_allocator<A>()); // list (size_type, T, allocator)
71 static_assert(std::is_same_v<decltype(lst)::value_type, A>, "");
72 static_assert(std::is_same_v<decltype(lst)::allocator_type, test_allocator<A>>, "");
73 assert(lst.size() == 1);
74 }
75
76 {
77 std::list lst{1U, 2U, 3U, 4U, 5U}; // list(initializer-list)
78 static_assert(std::is_same_v<decltype(lst)::value_type, unsigned>, "");
79 assert(lst.size() == 5);
80 auto it = lst.begin();
81 std::advance(i&: it, n: 2);
82 assert(*it == 3U);
83 }
84
85 {
86 std::list lst({1.0, 2.0, 3.0, 4.0}, test_allocator<double>()); // list(initializer-list, allocator)
87 static_assert(std::is_same_v<decltype(lst)::value_type, double>, "");
88 static_assert(std::is_same_v<decltype(lst)::allocator_type, test_allocator<double>>, "");
89 assert(lst.size() == 4);
90 auto it = lst.begin();
91 std::advance(it, 3);
92 assert(*it == 4.0);
93 }
94
95 {
96 std::list<long double> source;
97 std::list lst(source); // list(list &)
98 static_assert(std::is_same_v<decltype(lst)::value_type, long double>, "");
99 static_assert(std::is_same_v<decltype(lst)::allocator_type, std::allocator<long double>>, "");
100 assert(lst.size() == 0);
101 }
102
103 {
104 typedef test_allocator<short> Alloc;
105 typedef test_allocator<int> ConvertibleToAlloc;
106
107 {
108 std::list<short, Alloc> source;
109 std::list lst(source, Alloc(2));
110 static_assert(std::is_same_v<decltype(lst), decltype(source)>);
111 }
112
113 {
114 std::list<short, Alloc> source;
115 std::list lst(source, ConvertibleToAlloc(2));
116 static_assert(std::is_same_v<decltype(lst), decltype(source)>);
117 }
118
119 {
120 std::list<short, Alloc> source;
121 std::list lst(std::move(source), Alloc(2));
122 static_assert(std::is_same_v<decltype(lst), decltype(source)>);
123 }
124
125 {
126 std::list<short, Alloc> source;
127 std::list lst(std::move(source), ConvertibleToAlloc(2));
128 static_assert(std::is_same_v<decltype(lst), decltype(source)>);
129 }
130 }
131
132#if TEST_STD_VER >= 23
133 {
134 {
135 std::list c(std::from_range, std::array<int, 0>());
136 static_assert(std::is_same_v<decltype(c), std::list<int>>);
137 }
138
139 {
140 using Alloc = test_allocator<int>;
141 std::list c(std::from_range, std::array<int, 0>(), Alloc());
142 static_assert(std::is_same_v<decltype(c), std::list<int, Alloc>>);
143 }
144 }
145#endif
146
147 SequenceContainerDeductionGuidesSfinaeAway<std::list, std::list<int>>();
148
149 return 0;
150}
151

source code of libcxx/test/std/containers/sequences/list/list.cons/deduct.pass.cpp