1 // -*- C++ -*-
2 //===------------------------------ span ---------------------------------===//
3 //
4 // The LLVM Compiler Infrastructure
5 //
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
8 //
9 //===---------------------------------------------------------------------===//
10 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
11
12 // <span>
13
14 // constexpr pointer data() const noexcept;
15 //
16
17
18 #include <span>
19 #include <cassert>
20 #include <string>
21
22 #include "test_macros.h"
23
24
25 template <typename Span>
testConstexprSpan(Span sp,typename Span::pointer ptr)26 constexpr bool testConstexprSpan(Span sp, typename Span::pointer ptr)
27 {
28 ASSERT_NOEXCEPT(sp.data());
29 return sp.data() == ptr;
30 }
31
32
33 template <typename Span>
testRuntimeSpan(Span sp,typename Span::pointer ptr)34 void testRuntimeSpan(Span sp, typename Span::pointer ptr)
35 {
36 ASSERT_NOEXCEPT(sp.data());
37 assert(sp.data() == ptr);
38 }
39
40 struct A{};
41 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
42 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
43
main()44 int main ()
45 {
46
47 // dynamic size
48 static_assert(testConstexprSpan(std::span<int>(), nullptr), "");
49 static_assert(testConstexprSpan(std::span<long>(), nullptr), "");
50 static_assert(testConstexprSpan(std::span<double>(), nullptr), "");
51 static_assert(testConstexprSpan(std::span<A>(), nullptr), "");
52 static_assert(testConstexprSpan(std::span<std::string>(), nullptr), "");
53
54 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), iArr1), "");
55 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), iArr1), "");
56 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), iArr1), "");
57 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), iArr1), "");
58
59 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 1, 1), iArr1 + 1), "");
60 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 2, 2), iArr1 + 2), "");
61 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 3, 3), iArr1 + 3), "");
62 static_assert(testConstexprSpan(std::span<const int>(iArr1 + 4, 4), iArr1 + 4), "");
63
64 // static size
65 static_assert(testConstexprSpan(std::span<int, 0>(), nullptr), "");
66 static_assert(testConstexprSpan(std::span<long, 0>(), nullptr), "");
67 static_assert(testConstexprSpan(std::span<double, 0>(), nullptr), "");
68 static_assert(testConstexprSpan(std::span<A, 0>(), nullptr), "");
69 static_assert(testConstexprSpan(std::span<std::string, 0>(), nullptr), "");
70
71 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), iArr1), "");
72 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), iArr1), "");
73 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), iArr1), "");
74 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), iArr1), "");
75
76 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1 + 1, 1), iArr1 + 1), "");
77 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1 + 2, 2), iArr1 + 2), "");
78 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1 + 3, 3), iArr1 + 3), "");
79 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1 + 4, 4), iArr1 + 4), "");
80
81
82 // dynamic size
83 testRuntimeSpan(std::span<int>(), nullptr);
84 testRuntimeSpan(std::span<long>(), nullptr);
85 testRuntimeSpan(std::span<double>(), nullptr);
86 testRuntimeSpan(std::span<A>(), nullptr);
87 testRuntimeSpan(std::span<std::string>(), nullptr);
88
89 testRuntimeSpan(std::span<int>(iArr2, 1), iArr2);
90 testRuntimeSpan(std::span<int>(iArr2, 2), iArr2);
91 testRuntimeSpan(std::span<int>(iArr2, 3), iArr2);
92 testRuntimeSpan(std::span<int>(iArr2, 4), iArr2);
93
94 testRuntimeSpan(std::span<int>(iArr2 + 1, 1), iArr2 + 1);
95 testRuntimeSpan(std::span<int>(iArr2 + 2, 2), iArr2 + 2);
96 testRuntimeSpan(std::span<int>(iArr2 + 3, 3), iArr2 + 3);
97 testRuntimeSpan(std::span<int>(iArr2 + 4, 4), iArr2 + 4);
98
99 // static size
100 testRuntimeSpan(std::span<int, 0>(), nullptr);
101 testRuntimeSpan(std::span<long, 0>(), nullptr);
102 testRuntimeSpan(std::span<double, 0>(), nullptr);
103 testRuntimeSpan(std::span<A, 0>(), nullptr);
104 testRuntimeSpan(std::span<std::string, 0>(), nullptr);
105
106 testRuntimeSpan(std::span<int, 1>(iArr2, 1), iArr2);
107 testRuntimeSpan(std::span<int, 2>(iArr2, 2), iArr2);
108 testRuntimeSpan(std::span<int, 3>(iArr2, 3), iArr2);
109 testRuntimeSpan(std::span<int, 4>(iArr2, 4), iArr2);
110
111 testRuntimeSpan(std::span<int, 1>(iArr2 + 1, 1), iArr2 + 1);
112 testRuntimeSpan(std::span<int, 2>(iArr2 + 2, 2), iArr2 + 2);
113 testRuntimeSpan(std::span<int, 3>(iArr2 + 3, 3), iArr2 + 3);
114 testRuntimeSpan(std::span<int, 4>(iArr2 + 4, 4), iArr2 + 4);
115
116
117 std::string s;
118 testRuntimeSpan(std::span<std::string>(&s, 1), &s);
119 testRuntimeSpan(std::span<std::string, 1>(&s, 1), &s);
120
121 }
122