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 // UNSUPPORTED: clang-5, apple-clang-9
12 // UNSUPPORTED: libcpp-no-deduction-guides
13 // Clang 5 will generate bad implicit deduction guides
14 // Specifically, for the copy constructor.
15
16
17 // template<class Container>
18 // stack(Container) -> stack<typename Container::value_type, Container>;
19 //
20 // template<class Container, class Allocator>
21 // stack(Container, Allocator) -> stack<typename Container::value_type, Container>;
22
23
24 #include <stack>
25 #include <vector>
26 #include <list>
27 #include <iterator>
28 #include <cassert>
29 #include <cstddef>
30 #include <climits> // INT_MAX
31
32 #include "test_macros.h"
33 #include "test_iterators.h"
34 #include "test_allocator.h"
35
36 struct A {};
37
main(int,char **)38 int main(int, char**)
39 {
40
41 // Test the explicit deduction guides
42 {
43 std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
44 std::stack stk(v);
45
46 static_assert(std::is_same_v<decltype(stk), std::stack<int, std::vector<int>>>, "");
47 assert(stk.size() == v.size());
48 assert(stk.top() == v.back());
49 }
50
51 {
52 std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
53 std::stack stk(l, test_allocator<long>(0,2)); // different allocator
54 static_assert(std::is_same_v<decltype(stk)::container_type, std::list<long, test_allocator<long>>>, "");
55 static_assert(std::is_same_v<decltype(stk)::value_type, long>, "");
56 assert(stk.size() == 10);
57 assert(stk.top() == 19);
58 // I'd like to assert that we've gotten the right allocator in the stack, but
59 // I don't know how to get at the underlying container.
60 }
61
62 // Test the implicit deduction guides
63
64 {
65 // We don't expect this one to work - no way to implicitly get value_type
66 // std::stack stk(std::allocator<int>()); // stack (allocator &)
67 }
68
69 {
70 std::stack<A> source;
71 std::stack stk(source); // stack(stack &)
72 static_assert(std::is_same_v<decltype(stk)::value_type, A>, "");
73 static_assert(std::is_same_v<decltype(stk)::container_type, std::deque<A>>, "");
74 assert(stk.size() == 0);
75 }
76
77 {
78 // This one is odd - you can pass an allocator in to use, but the allocator
79 // has to match the type of the one used by the underlying container
80 typedef short T;
81 typedef test_allocator<T> Alloc;
82 typedef std::deque<T, Alloc> Container;
83
84 Container c{0,1,2,3};
85 std::stack<T, Container> source(c);
86 std::stack stk(source, Alloc(2)); // stack(stack &, allocator)
87 static_assert(std::is_same_v<decltype(stk)::value_type, T>, "");
88 static_assert(std::is_same_v<decltype(stk)::container_type, Container>, "");
89 assert(stk.size() == 4);
90 assert(stk.top() == 3);
91 }
92
93
94 return 0;
95 }
96