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 // <array>
10 // UNSUPPORTED: c++98, c++03, c++11, c++14
11 // UNSUPPORTED: libcpp-no-deduction-guides
12 
13 
14 // template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
15 //    deque(InputIterator, InputIterator, Allocator = Allocator())
16 //    -> deque<typename iterator_traits<InputIterator>::value_type, Allocator>;
17 //
18 
19 
20 #include <deque>
21 #include <iterator>
22 #include <cassert>
23 #include <cstddef>
24 #include <climits> // INT_MAX
25 
26 #include "test_macros.h"
27 #include "test_iterators.h"
28 #include "test_allocator.h"
29 
30 struct A {};
31 
32 int main(int, char**)
33 {
34 
35 //  Test the explicit deduction guides
36     {
37     const int arr[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
38     std::deque deq(std::begin(arr), std::end(arr));
39 
40     static_assert(std::is_same_v<decltype(deq), std::deque<int>>, "");
41     assert(std::equal(deq.begin(), deq.end(), std::begin(arr), std::end(arr)));
42     }
43 
44     {
45     const long arr[] = {INT_MAX, 1L, 2L, 3L };
46     std::deque deq(std::begin(arr), std::end(arr), std::allocator<long>());
47     static_assert(std::is_same_v<decltype(deq)::value_type, long>, "");
48     assert(deq.size() == 4);
49     assert(deq[0] == INT_MAX);
50     assert(deq[1] == 1L);
51     assert(deq[2] == 2L);
52     }
53 
54 //  Test the implicit deduction guides
55 
56     {
57 //  We don't expect this one to work.
58 //  std::deque deq(std::allocator<int>()); // deque (allocator &)
59     }
60 
61     {
62     std::deque deq(1, A{}); // deque (size_type, T)
63     static_assert(std::is_same_v<decltype(deq)::value_type, A>, "");
64     static_assert(std::is_same_v<decltype(deq)::allocator_type, std::allocator<A>>, "");
65     assert(deq.size() == 1);
66     }
67 
68     {
69     std::deque deq(1, A{}, test_allocator<A>()); // deque (size_type, T, allocator)
70     static_assert(std::is_same_v<decltype(deq)::value_type, A>, "");
71     static_assert(std::is_same_v<decltype(deq)::allocator_type, test_allocator<A>>, "");
72     assert(deq.size() == 1);
73     }
74 
75     {
76     std::deque deq{1U, 2U, 3U, 4U, 5U}; // deque(initializer-list)
77     static_assert(std::is_same_v<decltype(deq)::value_type, unsigned>, "");
78     assert(deq.size() == 5);
79     assert(deq[2] == 3U);
80     }
81 
82     {
83     std::deque deq({1.0, 2.0, 3.0, 4.0}, test_allocator<double>()); // deque(initializer-list, allocator)
84     static_assert(std::is_same_v<decltype(deq)::value_type, double>, "");
85     static_assert(std::is_same_v<decltype(deq)::allocator_type, test_allocator<double>>, "");
86     assert(deq.size() == 4);
87     assert(deq[3] == 4.0);
88     }
89 
90     {
91     std::deque<long double> source;
92     std::deque deq(source); // deque(deque &)
93     static_assert(std::is_same_v<decltype(deq)::value_type, long double>, "");
94     static_assert(std::is_same_v<decltype(deq)::allocator_type, std::allocator<long double>>, "");
95     assert(deq.size() == 0);
96     }
97 
98   return 0;
99 }
100