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