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 // <forward_list>
10 // UNSUPPORTED: c++03, c++11, c++14
11
12 // template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
13 // forward_list(InputIterator, InputIterator, Allocator = Allocator())
14 // -> forward_list<typename iterator_traits<InputIterator>::value_type, Allocator>;
15 //
16 // template<ranges::input_range R, class Allocator = allocator<ranges::range_value_t<R>>>
17 // forward_list(from_range_t, R&&, Allocator = Allocator())
18 // -> forward_list<ranges::range_value_t<R>, Allocator>; // C++23
19
20 #include <algorithm>
21 #include <array>
22 #include <forward_list>
23 #include <iterator>
24 #include <cassert>
25 #include <cstddef>
26 #include <climits> // INT_MAX
27
28 #include "deduction_guides_sfinae_checks.h"
29 #include "test_macros.h"
30 #include "test_iterators.h"
31 #include "test_allocator.h"
32
33 struct A {};
34
main(int,char **)35 int main(int, char**)
36 {
37
38 // Test the explicit deduction guides
39 {
40 const int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
41 std::forward_list fwl(std::begin(arr), std::end(arr));
42
43 static_assert(std::is_same_v<decltype(fwl), std::forward_list<int>>, "");
44 assert(std::equal(fwl.begin(), fwl.end(), std::begin(arr), std::end(arr)));
45 }
46
47 {
48 const long arr[] = {INT_MAX, 1L, 2L, 3L };
49 std::forward_list fwl(std::begin(arr), std::end(arr), std::allocator<long>());
50 static_assert(std::is_same_v<decltype(fwl)::value_type, long>, "");
51 assert(std::distance(fwl.begin(), fwl.end()) == 4); // no size for forward_list
52 auto it = fwl.begin();
53 assert(*it++ == INT_MAX);
54 assert(*it++ == 1L);
55 assert(*it++ == 2L);
56 }
57
58 // Test the implicit deduction guides
59
60 {
61 // We don't expect this one to work.
62 // std::forward_list fwl(std::allocator<int>()); // deque (allocator &)
63 }
64
65 {
66 std::forward_list fwl(1, A{}); // deque (size_type, T)
67 static_assert(std::is_same_v<decltype(fwl)::value_type, A>, "");
68 static_assert(std::is_same_v<decltype(fwl)::allocator_type, std::allocator<A>>, "");
69 assert(std::distance(fwl.begin(), fwl.end()) == 1); // no size for forward_list
70 }
71
72 {
73 std::forward_list fwl(1, A{}, test_allocator<A>()); // deque (size_type, T, allocator)
74 static_assert(std::is_same_v<decltype(fwl)::value_type, A>, "");
75 static_assert(std::is_same_v<decltype(fwl)::allocator_type, test_allocator<A>>, "");
76 assert(std::distance(fwl.begin(), fwl.end()) == 1); // no size for forward_list
77 }
78
79 {
80 std::forward_list fwl{1U, 2U, 3U, 4U, 5U}; // deque(initializer-list)
81 static_assert(std::is_same_v<decltype(fwl)::value_type, unsigned>, "");
82 assert(std::distance(fwl.begin(), fwl.end()) == 5); // no size for forward_list
83 auto it = fwl.begin();
84 std::advance(it, 2);
85 assert(*it == 3U);
86 }
87
88 {
89 std::forward_list fwl({1.0, 2.0, 3.0, 4.0}, test_allocator<double>()); // deque(initializer-list, allocator)
90 static_assert(std::is_same_v<decltype(fwl)::value_type, double>, "");
91 static_assert(std::is_same_v<decltype(fwl)::allocator_type, test_allocator<double>>, "");
92 assert(std::distance(fwl.begin(), fwl.end()) == 4); // no size for forward_list
93 auto it = fwl.begin();
94 std::advance(it, 3);
95 assert(*it == 4.0);
96 }
97
98 {
99 std::forward_list<long double> source;
100 std::forward_list fwl(source); // deque(deque &)
101 static_assert(std::is_same_v<decltype(fwl)::value_type, long double>, "");
102 static_assert(std::is_same_v<decltype(fwl)::allocator_type, std::allocator<long double>>, "");
103 assert(std::distance(fwl.begin(), fwl.end()) == 0); // no size for forward_list
104 }
105
106 {
107 typedef test_allocator<short> Alloc;
108 typedef test_allocator<int> ConvertibleToAlloc;
109
110 {
111 std::forward_list<short, Alloc> source;
112 std::forward_list fwl(source, Alloc(2));
113 static_assert(std::is_same_v<decltype(fwl), decltype(source)>);
114 }
115
116 {
117 std::forward_list<short, Alloc> source;
118 std::forward_list fwl(source, ConvertibleToAlloc(2));
119 static_assert(std::is_same_v<decltype(fwl), decltype(source)>);
120 }
121
122 {
123 std::forward_list<short, Alloc> source;
124 std::forward_list fwl(std::move(source), Alloc(2));
125 static_assert(std::is_same_v<decltype(fwl), decltype(source)>);
126 }
127
128 {
129 std::forward_list<short, Alloc> source;
130 std::forward_list fwl(std::move(source), ConvertibleToAlloc(2));
131 static_assert(std::is_same_v<decltype(fwl), decltype(source)>);
132 }
133 }
134
135 #if TEST_STD_VER >= 23
136 {
137 {
138 std::forward_list c(std::from_range, std::array<int, 0>());
139 static_assert(std::is_same_v<decltype(c), std::forward_list<int>>);
140 }
141
142 {
143 using Alloc = test_allocator<int>;
144 std::forward_list c(std::from_range, std::array<int, 0>(), Alloc());
145 static_assert(std::is_same_v<decltype(c), std::forward_list<int, Alloc>>);
146 }
147 }
148 #endif
149
150 SequenceContainerDeductionGuidesSfinaeAway<std::forward_list, std::forward_list<int>>();
151
152 return 0;
153 }
154