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
test_iterator_sentinel()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
test_c_array()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
test_std_array()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
test_range_std_container()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
main(int,char **)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