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 // constexpr pointer data() const noexcept;
13 //
14
15
16 #include <span>
17 #include <cassert>
18 #include <string>
19
20 #include "test_macros.h"
21
22
23 template <typename Span>
testConstexprSpan(Span sp,typename Span::pointer ptr)24 constexpr bool testConstexprSpan(Span sp, typename Span::pointer ptr)
25 {
26 ASSERT_NOEXCEPT(sp.data());
27 return sp.data() == ptr;
28 }
29
30
31 template <typename Span>
testRuntimeSpan(Span sp,typename Span::pointer ptr)32 void testRuntimeSpan(Span sp, typename Span::pointer ptr)
33 {
34 ASSERT_NOEXCEPT(sp.data());
35 assert(sp.data() == ptr);
36 }
37
38 struct A{};
39 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
40 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
41
main(int,char **)42 int main(int, char**)
43 {
44
45 // dynamic size
46 static_assert(testConstexprSpan(std::span<int>(), nullptr), "");
47 static_assert(testConstexprSpan(std::span<long>(), nullptr), "");
48 static_assert(testConstexprSpan(std::span<double>(), nullptr), "");
49 static_assert(testConstexprSpan(std::span<A>(), nullptr), "");
50 static_assert(testConstexprSpan(std::span<std::string>(), nullptr), "");
51
52 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), iArr1), "");
53 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), iArr1), "");
54 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), iArr1), "");
55 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), iArr1), "");
56
57 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 1, 1), iArr1 + 1), "");
58 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 2, 2), iArr1 + 2), "");
59 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 3, 3), iArr1 + 3), "");
60 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 4, 4), iArr1 + 4), "");
61
62 // static size
63 static_assert(testConstexprSpan(std::span<int, 0>(), nullptr), "");
64 static_assert(testConstexprSpan(std::span<long, 0>(), nullptr), "");
65 static_assert(testConstexprSpan(std::span<double, 0>(), nullptr), "");
66 static_assert(testConstexprSpan(std::span<A, 0>(), nullptr), "");
67 static_assert(testConstexprSpan(std::span<std::string, 0>(), nullptr), "");
68
69 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), iArr1), "");
70 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), iArr1), "");
71 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), iArr1), "");
72 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), iArr1), "");
73
74 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1 + 1, 1), iArr1 + 1), "");
75 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1 + 2, 2), iArr1 + 2), "");
76 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1 + 3, 3), iArr1 + 3), "");
77 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1 + 4, 4), iArr1 + 4), "");
78
79
80 // dynamic size
81 testRuntimeSpan(std::span<int>(), nullptr);
82 testRuntimeSpan(std::span<long>(), nullptr);
83 testRuntimeSpan(std::span<double>(), nullptr);
84 testRuntimeSpan(std::span<A>(), nullptr);
85 testRuntimeSpan(std::span<std::string>(), nullptr);
86
87 testRuntimeSpan(std::span<int>(iArr2, 1), iArr2);
88 testRuntimeSpan(std::span<int>(iArr2, 2), iArr2);
89 testRuntimeSpan(std::span<int>(iArr2, 3), iArr2);
90 testRuntimeSpan(std::span<int>(iArr2, 4), iArr2);
91
92 testRuntimeSpan(std::span<int>(iArr2 + 1, 1), iArr2 + 1);
93 testRuntimeSpan(std::span<int>(iArr2 + 2, 2), iArr2 + 2);
94 testRuntimeSpan(std::span<int>(iArr2 + 3, 3), iArr2 + 3);
95 testRuntimeSpan(std::span<int>(iArr2 + 4, 4), iArr2 + 4);
96
97 // static size
98 testRuntimeSpan(std::span<int, 0>(), nullptr);
99 testRuntimeSpan(std::span<long, 0>(), nullptr);
100 testRuntimeSpan(std::span<double, 0>(), nullptr);
101 testRuntimeSpan(std::span<A, 0>(), nullptr);
102 testRuntimeSpan(std::span<std::string, 0>(), nullptr);
103
104 testRuntimeSpan(std::span<int, 1>(iArr2, 1), iArr2);
105 testRuntimeSpan(std::span<int, 2>(iArr2, 2), iArr2);
106 testRuntimeSpan(std::span<int, 3>(iArr2, 3), iArr2);
107 testRuntimeSpan(std::span<int, 4>(iArr2, 4), iArr2);
108
109 testRuntimeSpan(std::span<int, 1>(iArr2 + 1, 1), iArr2 + 1);
110 testRuntimeSpan(std::span<int, 2>(iArr2 + 2, 2), iArr2 + 2);
111 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), iArr2 + 3);
112 testRuntimeSpan(std::span<int, 4>(iArr2 + 4, 4), iArr2 + 4);
113
114
115 std::string s;
116 testRuntimeSpan(std::span<std::string>(&s, 1), &s);
117 testRuntimeSpan(std::span<std::string, 1>(&s, 1), &s);
118
119
120 return 0;
121 }
122