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 // <stack>
10 // UNSUPPORTED: c++03, c++11, c++14
11
12 // template<class Container>
13 // stack(Container) -> stack<typename Container::value_type, Container>;
14 //
15 // template<class Container, class Allocator>
16 // stack(Container, Allocator) -> stack<typename Container::value_type, Container>;
17
18
19 #include <array>
20 #include <stack>
21 #include <deque>
22 #include <vector>
23 #include <list>
24 #include <iterator>
25 #include <cassert>
26 #include <cstddef>
27 #include <climits> // INT_MAX
28
29 #include "deduction_guides_sfinae_checks.h"
30 #include "test_macros.h"
31 #include "test_iterators.h"
32 #include "test_allocator.h"
33
34 struct A {};
35
main(int,char **)36 int main(int, char**)
37 {
38
39 // Test the explicit deduction guides
40 {
41 std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
42 std::stack stk(v);
43
44 static_assert(std::is_same_v<decltype(stk), std::stack<int, std::vector<int>>>, "");
45 assert(stk.size() == v.size());
46 assert(stk.top() == v.back());
47 }
48
49 {
50 std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
51 std::stack stk(l, test_allocator<long>(0,2)); // different allocator
52 static_assert(std::is_same_v<decltype(stk)::container_type, std::list<long, test_allocator<long>>>, "");
53 static_assert(std::is_same_v<decltype(stk)::value_type, long>, "");
54 assert(stk.size() == 10);
55 assert(stk.top() == 19);
56 // I'd like to assert that we've gotten the right allocator in the stack, but
57 // I don't know how to get at the underlying container.
58 }
59
60 // Test the implicit deduction guides
61
62 {
63 // We don't expect this one to work - no way to implicitly get value_type
64 // std::stack stk(std::allocator<int>()); // stack (allocator &)
65 }
66
67 {
68 std::stack<A> source;
69 std::stack stk(source); // stack(stack &)
70 static_assert(std::is_same_v<decltype(stk)::value_type, A>, "");
71 static_assert(std::is_same_v<decltype(stk)::container_type, std::deque<A>>, "");
72 assert(stk.size() == 0);
73 }
74
75 {
76 typedef short T;
77 typedef test_allocator<T> Alloc;
78 typedef std::list<T, Alloc> Cont;
79 typedef test_allocator<int> ConvertibleToAlloc;
80 static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
81 !std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
82
83 {
84 Cont cont;
85 std::stack stk(cont, Alloc(2));
86 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
87 }
88
89 {
90 Cont cont;
91 std::stack stk(cont, ConvertibleToAlloc(2));
92 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
93 }
94
95 {
96 Cont cont;
97 std::stack stk(std::move(cont), Alloc(2));
98 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
99 }
100
101 {
102 Cont cont;
103 std::stack stk(std::move(cont), ConvertibleToAlloc(2));
104 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
105 }
106 }
107
108 {
109 typedef short T;
110 typedef test_allocator<T> Alloc;
111 typedef std::list<T, Alloc> Cont;
112 typedef test_allocator<int> ConvertibleToAlloc;
113 static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
114 !std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
115
116 {
117 std::stack<T, Cont> source;
118 std::stack stk(source, Alloc(2));
119 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
120 }
121
122 {
123 std::stack<T, Cont> source;
124 std::stack stk(source, ConvertibleToAlloc(2));
125 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
126 }
127
128 {
129 std::stack<T, Cont> source;
130 std::stack stk(std::move(source), Alloc(2));
131 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
132 }
133
134 {
135 std::stack<T, Cont> source;
136 std::stack stk(std::move(source), ConvertibleToAlloc(2));
137 static_assert(std::is_same_v<decltype(stk), std::stack<T, Cont>>);
138 }
139 }
140
141 // Deduction guides should be SFINAE'd away when given:
142 // - a "bad" allocator (that is, a type not qualifying as an allocator);
143 // - an allocator instead of a container;
144 // - an allocator and a container that uses a different allocator.
145 {
146 using Cont = std::list<int>;
147 using Alloc = std::allocator<int>;
148 using DiffAlloc = test_allocator<int>;
149 using Iter = int;
150
151 struct NotIter {};
152 struct NotAlloc {};
153
154 static_assert(SFINAEs_away<std::stack, Alloc, Alloc>);
155 static_assert(SFINAEs_away<std::stack, Cont, NotAlloc>);
156 static_assert(SFINAEs_away<std::stack, Cont, DiffAlloc>);
157 static_assert(SFINAEs_away<std::stack, Iter, NotIter>);
158 #if TEST_STD_VER > 20
159 static_assert(SFINAEs_away<std::stack, Iter, NotIter, Alloc>);
160 static_assert(SFINAEs_away<std::stack, Iter, Iter, NotAlloc>);
161 #endif
162 }
163
164 #if TEST_STD_VER > 20
165 {
166 typedef short T;
167 typedef test_allocator<T> Alloc;
168 std::list<T> a;
169 {
170 std::stack s(a.begin(), a.end());
171 static_assert(std::is_same_v<decltype(s), std::stack<T>>);
172 }
173 {
174 std::stack s(a.begin(), a.end(), Alloc());
175 static_assert(std::is_same_v<decltype(s), std::stack<T, std::deque<T, Alloc>>>);
176 }
177 }
178 #endif
179
180 return 0;
181 }
182