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 // <queue>
10 // UNSUPPORTED: c++03, c++11, c++14
11 // UNSUPPORTED: libcpp-no-deduction-guides
12
13 // template<class Compare, class Container>
14 // priority_queue(Compare, Container)
15 // -> priority_queue<typename Container::value_type, Container, Compare>;
16 //
17 // template<class InputIterator,
18 // class Compare = less<typename iterator_traits<InputIterator>::value_type>,
19 // class Container = vector<typename iterator_traits<InputIterator>::value_type>>
20 // priority_queue(InputIterator, InputIterator, Compare = Compare(), Container = Container())
21 // -> priority_queue<typename iterator_traits<InputIterator>::value_type, Container, Compare>;
22 //
23 // template<class Compare, class Container, class Allocator>
24 // priority_queue(Compare, Container, Allocator)
25 // -> priority_queue<typename Container::value_type, Container, Compare>;
26
27
28 #include <queue>
29 #include <vector>
30 #include <iterator>
31 #include <cassert>
32 #include <cstddef>
33 #include <climits> // INT_MAX
34
35 #include "test_macros.h"
36 #include "test_iterators.h"
37 #include "test_allocator.h"
38
39 struct A {};
40
main(int,char **)41 int main(int, char**)
42 {
43
44 // Test the explicit deduction guides
45 {
46 std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
47 std::priority_queue pri(std::greater<int>(), v); // priority_queue(Compare, Container)
48
49 static_assert(std::is_same_v<decltype(pri), std::priority_queue<int, std::vector<int>, std::greater<int>>>, "");
50 assert(pri.size() == v.size());
51 assert(pri.top() == 0);
52 }
53
54 {
55 std::vector<long, test_allocator<long>> v{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
56 std::priority_queue pri(std::greater<long>(), v, test_allocator<long>(2)); // priority_queue(Compare, Container, Allocator)
57
58 static_assert(std::is_same_v<decltype(pri),
59 std::priority_queue<long, std::vector<long, test_allocator<long>>, std::greater<long>>>, "");
60 assert(pri.size() == v.size());
61 assert(pri.top() == 10);
62 }
63
64 {
65 std::vector<short> v{10, 11, 12, 13, 14, 15, 28, 17, 18, 19 };
66 std::priority_queue pri(v.begin(), v.end()); // priority_queue(Iter, Iter)
67
68 static_assert(std::is_same_v<decltype(pri), std::priority_queue<short>>, "");
69 assert(pri.size() == v.size());
70 assert(pri.top() == 28);
71 }
72
73 {
74 std::vector<double> v{10, 11, 12, 13, 6, 15, 28, 17, 18, 19 };
75 std::priority_queue pri(v.begin(), v.end(), std::greater<double>()); // priority_queue(Iter, Iter, Comp)
76
77 static_assert(std::is_same_v<decltype(pri), std::priority_queue<double, std::vector<double>, std::greater<double>>>, "");
78 assert(pri.size() == v.size());
79 assert(pri.top() == 6);
80 }
81
82 {
83 std::vector<double> v{10, 6, 15, 28, 4, 18, 19 };
84 std::deque<double> deq;
85 std::priority_queue pri(v.begin(), v.end(), std::greater<double>(), deq); // priority_queue(Iter, Iter, Comp, Container)
86
87 static_assert(std::is_same_v<decltype(pri), std::priority_queue<double, std::deque<double>, std::greater<double>>>, "");
88 assert(pri.size() == v.size());
89 assert(pri.top() == 4);
90 }
91
92 // Test the implicit deduction guides
93 {
94 // We don't expect this one to work - no way to implicitly get value_type
95 // std::priority_queue pri(std::allocator<int>()); // queue (allocator &)
96 }
97
98 {
99 std::priority_queue<float> source;
100 std::priority_queue pri(source); // priority_queue(priority_queue &)
101 static_assert(std::is_same_v<decltype(pri)::value_type, float>, "");
102 static_assert(std::is_same_v<decltype(pri)::container_type, std::vector<float>>, "");
103 assert(pri.size() == 0);
104 }
105
106 {
107 // This one is odd - you can pass an allocator in to use, but the allocator
108 // has to match the type of the one used by the underlying container
109 typedef long double T;
110 typedef std::greater<T> Comp;
111 typedef test_allocator<T> Alloc;
112 typedef std::deque<T, Alloc> Cont;
113
114 Cont c{2,3,0,1};
115 std::priority_queue<T, Cont, Comp> source(Comp(), c);
116 std::priority_queue pri(source, Alloc(2)); // queue(queue &, allocator)
117 static_assert(std::is_same_v<decltype(pri)::value_type, T>, "");
118 static_assert(std::is_same_v<decltype(pri)::container_type, Cont>, "");
119 assert(pri.size() == 4);
120 assert(pri.top() == 0);
121 }
122
123 return 0;
124 }
125