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 // UNSUPPORTED: c++03, c++11, c++14, c++17
9 
10 // <span>
11 
12 //   template<class It, class EndOrSize>
13 //     span(It, EndOrSize) -> span<remove_reference_t<iter_reference_t<_It>>>;
14 //
15 //   template<class T, size_t N>
16 //     span(T (&)[N]) -> span<T, N>;
17 //
18 //   template<class T, size_t N>
19 //     span(array<T, N>&) -> span<T, N>;
20 //
21 //   template<class T, size_t N>
22 //     span(const array<T, N>&) -> span<const T, N>;
23 //
24 //   template<class R>
25 //     span(R&&) -> span<remove_reference_t<ranges::range_reference_t<R>>>;
26 
27 
28 #include <span>
29 #include <array>
30 #include <cassert>
31 #include <iterator>
32 #include <memory>
33 #include <string>
34 
35 #include "test_macros.h"
36 
37 void test_iterator_sentinel() {
38   int arr[] = {1, 2, 3};
39   {
40   std::span s{std::begin(arr), std::end(arr)};
41   ASSERT_SAME_TYPE(decltype(s), std::span<int>);
42   assert(s.size() == std::size(arr));
43   assert(s.data() == std::data(arr));
44   }
45   {
46   std::span s{std::begin(arr), 3};
47   ASSERT_SAME_TYPE(decltype(s), std::span<int>);
48   assert(s.size() == std::size(arr));
49   assert(s.data() == std::data(arr));
50   }
51 }
52 
53 void test_c_array() {
54     {
55     int arr[] = {1, 2, 3};
56     std::span s{arr};
57     ASSERT_SAME_TYPE(decltype(s), std::span<int, 3>);
58     assert(s.size() == std::size(arr));
59     assert(s.data() == std::data(arr));
60     }
61 
62     {
63     const int arr[] = {1,2,3};
64     std::span s{arr};
65     ASSERT_SAME_TYPE(decltype(s), std::span<const int, 3>);
66     assert(s.size() == std::size(arr));
67     assert(s.data() == std::data(arr));
68     }
69 }
70 
71 void test_std_array() {
72     {
73     std::array<double, 4> arr = {1.0, 2.0, 3.0, 4.0};
74     std::span s{arr};
75     ASSERT_SAME_TYPE(decltype(s), std::span<double, 4>);
76     assert(s.size() == arr.size());
77     assert(s.data() == arr.data());
78     }
79 
80     {
81     const std::array<long, 5> arr = {4, 5, 6, 7, 8};
82     std::span s{arr};
83     ASSERT_SAME_TYPE(decltype(s), std::span<const long, 5>);
84     assert(s.size() == arr.size());
85     assert(s.data() == arr.data());
86     }
87 }
88 
89 void test_range_std_container() {
90     {
91     std::string str{"ABCDE"};
92     std::span s{str};
93     ASSERT_SAME_TYPE(decltype(s), std::span<char>);
94     assert(s.size() == str.size());
95     assert(s.data() == str.data());
96     }
97 
98     {
99     const std::string str{"QWERTYUIOP"};
100     std::span s{str};
101     ASSERT_SAME_TYPE(decltype(s), std::span<const char>);
102     assert(s.size() == str.size());
103     assert(s.data() == str.data());
104     }
105 }
106 
107 int main(int, char**)
108 {
109   test_iterator_sentinel();
110   test_c_array();
111   test_std_array();
112   test_range_std_container();
113 
114   return 0;
115 }
116