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#include <span>
28#include <array>
29#include <cassert>
30#include <iterator>
31#include <memory>
32#include <string>
33#include <type_traits>
34
35#include "test_macros.h"
36
37void 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#if TEST_STD_VER >= 26
53 // P3029R1: deduction from `integral_constant`
54 {
55 std::span s{std::begin(arr), std::integral_constant<size_t, 3>{}};
56 ASSERT_SAME_TYPE(decltype(s), std::span<int, 3>);
57 assert(s.size() == std::size(arr));
58 assert(s.data() == std::data(arr));
59 }
60#endif
61}
62
63void test_c_array() {
64 {
65 int arr[] = {1, 2, 3};
66 std::span s{arr};
67 ASSERT_SAME_TYPE(decltype(s), std::span<int, 3>);
68 assert(s.size() == std::size(arr));
69 assert(s.data() == std::data(arr));
70 }
71
72 {
73 const int arr[] = {1, 2, 3};
74 std::span s{arr};
75 ASSERT_SAME_TYPE(decltype(s), std::span<const int, 3>);
76 assert(s.size() == std::size(arr));
77 assert(s.data() == std::data(arr));
78 }
79}
80
81void test_std_array() {
82 {
83 std::array<double, 4> arr = {1.0, 2.0, 3.0, 4.0};
84 std::span s{arr};
85 ASSERT_SAME_TYPE(decltype(s), std::span<double, 4>);
86 assert(s.size() == arr.size());
87 assert(s.data() == arr.data());
88 }
89
90 {
91 const std::array<long, 5> arr = {4, 5, 6, 7, 8};
92 std::span s{arr};
93 ASSERT_SAME_TYPE(decltype(s), std::span<const long, 5>);
94 assert(s.size() == arr.size());
95 assert(s.data() == arr.data());
96 }
97}
98
99void test_range_std_container() {
100 {
101 std::string str{"ABCDE"};
102 std::span s{str};
103 ASSERT_SAME_TYPE(decltype(s), std::span<char>);
104 assert(s.size() == str.size());
105 assert(s.data() == str.data());
106 }
107
108 {
109 const std::string str{"QWERTYUIOP"};
110 std::span s{str};
111 ASSERT_SAME_TYPE(decltype(s), std::span<const char>);
112 assert(s.size() == str.size());
113 assert(s.data() == str.data());
114 }
115}
116
117int main(int, char**) {
118 test_iterator_sentinel();
119 test_c_array();
120 test_std_array();
121 test_range_std_container();
122
123 return 0;
124}
125

source code of libcxx/test/std/containers/views/views.span/span.cons/deduct.pass.cpp