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// <vector>
10// UNSUPPORTED: c++03, c++11, c++14
11
12// template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
13// vector(InputIterator, InputIterator, Allocator = Allocator())
14// -> vector<typename iterator_traits<InputIterator>::value_type, Allocator>;
15//
16// template<ranges::input_range R, class Allocator = allocator<ranges::range_value_t<R>>>
17// vector(from_range_t, R&&, Allocator = Allocator())
18// -> vector<ranges::range_value_t<R>, Allocator>; // C++23
19
20#include <algorithm>
21#include <array>
22#include <cassert>
23#include <climits> // INT_MAX
24#include <cstddef>
25#include <iterator>
26#include <type_traits>
27#include <vector>
28
29#include "deduction_guides_sfinae_checks.h"
30#include "test_macros.h"
31#include "test_iterators.h"
32#include "test_allocator.h"
33
34struct A {};
35
36TEST_CONSTEXPR_CXX20 bool tests() {
37 // Test the explicit deduction guides
38 {
39 const int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
40 std::vector vec(std::begin(arr: arr), std::end(arr: arr));
41
42 static_assert(std::is_same_v<decltype(vec), std::vector<int>>, "");
43 assert(std::equal(vec.begin(), vec.end(), std::begin(arr), std::end(arr)));
44 }
45
46 {
47 const long arr[] = {INT_MAX, 1L, 2L, 3L};
48 std::vector vec(std::begin(arr: arr), std::end(arr: arr), std::allocator<long>());
49 static_assert(std::is_same_v<decltype(vec)::value_type, long>, "");
50 assert(vec.size() == 4);
51 assert(vec[0] == INT_MAX);
52 assert(vec[1] == 1L);
53 assert(vec[2] == 2L);
54 }
55
56 // Test the implicit deduction guides
57
58 {
59 // We don't expect this one to work.
60 // std::vector vec(std::allocator<int>()); // vector (allocator &)
61 }
62
63 {
64 std::vector vec(1, A{}); // vector (size_type, T)
65 static_assert(std::is_same_v<decltype(vec)::value_type, A>, "");
66 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<A>>, "");
67 assert(vec.size() == 1);
68 }
69
70 {
71 std::vector vec(1, A{}, test_allocator<A>()); // vector (size_type, T, allocator)
72 static_assert(std::is_same_v<decltype(vec)::value_type, A>, "");
73 static_assert(std::is_same_v<decltype(vec)::allocator_type, test_allocator<A>>, "");
74 assert(vec.size() == 1);
75 }
76
77 {
78 std::vector vec{1U, 2U, 3U, 4U, 5U}; // vector(initializer-list)
79 static_assert(std::is_same_v<decltype(vec)::value_type, unsigned>, "");
80 assert(vec.size() == 5);
81 assert(vec[2] == 3U);
82 }
83
84 {
85 std::vector vec({1.0, 2.0, 3.0, 4.0}, test_allocator<double>()); // vector(initializer-list, allocator)
86 static_assert(std::is_same_v<decltype(vec)::value_type, double>, "");
87 static_assert(std::is_same_v<decltype(vec)::allocator_type, test_allocator<double>>, "");
88 assert(vec.size() == 4);
89 assert(vec[3] == 4.0);
90 }
91
92 {
93 std::vector<long double> source;
94 std::vector vec(source); // vector(vector &)
95 static_assert(std::is_same_v<decltype(vec)::value_type, long double>, "");
96 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<long double>>, "");
97 assert(vec.size() == 0);
98 }
99
100#if TEST_STD_VER >= 23
101 {
102 {
103 std::vector c(std::from_range, std::array<int, 0>());
104 static_assert(std::is_same_v<decltype(c), std::vector<int>>);
105 }
106
107 {
108 using Alloc = test_allocator<int>;
109 std::vector c(std::from_range, std::array<int, 0>(), Alloc());
110 static_assert(std::is_same_v<decltype(c), std::vector<int, Alloc>>);
111 }
112 }
113#endif
114
115 // A couple of vector<bool> tests, too!
116 {
117 std::vector vec(3, true); // vector(initializer-list)
118 static_assert(std::is_same_v<decltype(vec)::value_type, bool>, "");
119 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, "");
120 assert(vec.size() == 3);
121 assert(vec[0] && vec[1] && vec[2]);
122 }
123
124 {
125 std::vector<bool> source;
126 std::vector vec(source); // vector(vector &)
127 static_assert(std::is_same_v<decltype(vec)::value_type, bool>, "");
128 static_assert(std::is_same_v<decltype(vec)::allocator_type, std::allocator<bool>>, "");
129 assert(vec.size() == 0);
130 }
131
132 {
133 typedef test_allocator<short> Alloc;
134 typedef test_allocator<int> ConvertibleToAlloc;
135
136 {
137 std::vector<short, Alloc> source;
138 std::vector vec(source, Alloc(2));
139 static_assert(std::is_same_v<decltype(vec), decltype(source)>);
140 }
141
142 {
143 std::vector<short, Alloc> source;
144 std::vector vec(source, ConvertibleToAlloc(2));
145 static_assert(std::is_same_v<decltype(vec), decltype(source)>);
146 }
147
148 {
149 std::vector<short, Alloc> source;
150 std::vector vec(std::move(source), Alloc(2));
151 static_assert(std::is_same_v<decltype(vec), decltype(source)>);
152 }
153
154 {
155 std::vector<short, Alloc> source;
156 std::vector vec(std::move(source), ConvertibleToAlloc(2));
157 static_assert(std::is_same_v<decltype(vec), decltype(source)>);
158 }
159 }
160
161 SequenceContainerDeductionGuidesSfinaeAway<std::vector, std::vector<int>>();
162
163 return true;
164}
165
166int main(int, char**) {
167 tests();
168#if TEST_STD_VER > 17
169 static_assert(tests());
170#endif
171 return 0;
172}
173

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