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 reference operator[](index_type idx) const;
15 // constexpr reference operator()(index_type idx) const;
16 //
17
18
19 #include <span>
20 #include <cassert>
21 #include <string>
22
23 #include "test_macros.h"
24
25
26 template <typename Span>
testConstexprSpan(Span sp,ptrdiff_t idx)27 constexpr bool testConstexprSpan(Span sp, ptrdiff_t idx)
28 {
29 _LIBCPP_ASSERT(noexcept(sp[idx]), "");
30 _LIBCPP_ASSERT(noexcept(sp(idx)), "");
31
32 typename Span::reference r1 = sp[idx];
33 typename Span::reference r2 = sp(idx);
34 typename Span::reference r3 = *(sp.data() + idx);
35 return r1 == r2 && r2 == r3;
36 }
37
38
39 template <typename Span>
testRuntimeSpan(Span sp,ptrdiff_t idx)40 void testRuntimeSpan(Span sp, ptrdiff_t idx)
41 {
42 _LIBCPP_ASSERT(noexcept(sp[idx]), "");
43 _LIBCPP_ASSERT(noexcept(sp(idx)), "");
44
45 typename Span::reference r1 = sp[idx];
46 typename Span::reference r2 = sp(idx);
47 typename Span::reference r3 = *(sp.data() + idx);
48 assert(r1 == r2 && r2 == r3);
49 }
50
51 struct A{};
52 constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
53 int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
54
main()55 int main ()
56 {
57 static_assert(testConstexprSpan(std::span<const int>(iArr1, 1), 0), "");
58
59 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 0), "");
60 static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 1), "");
61
62 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 0), "");
63 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 1), "");
64 static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 2), "");
65
66 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 0), "");
67 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 1), "");
68 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 2), "");
69 static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 3), "");
70
71
72 static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), 0), "");
73
74 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 0), "");
75 static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 1), "");
76
77 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 0), "");
78 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 1), "");
79 static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 2), "");
80
81 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 0), "");
82 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 1), "");
83 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 2), "");
84 static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 3), "");
85
86
87 testRuntimeSpan(std::span<int>(iArr2, 1), 0);
88
89 testRuntimeSpan(std::span<int>(iArr2, 2), 0);
90 testRuntimeSpan(std::span<int>(iArr2, 2), 1);
91
92 testRuntimeSpan(std::span<int>(iArr2, 3), 0);
93 testRuntimeSpan(std::span<int>(iArr2, 3), 1);
94 testRuntimeSpan(std::span<int>(iArr2, 3), 2);
95
96 testRuntimeSpan(std::span<int>(iArr2, 4), 0);
97 testRuntimeSpan(std::span<int>(iArr2, 4), 1);
98 testRuntimeSpan(std::span<int>(iArr2, 4), 2);
99 testRuntimeSpan(std::span<int>(iArr2, 4), 3);
100
101
102 testRuntimeSpan(std::span<int, 1>(iArr2, 1), 0);
103
104 testRuntimeSpan(std::span<int, 2>(iArr2, 2), 0);
105 testRuntimeSpan(std::span<int, 2>(iArr2, 2), 1);
106
107 testRuntimeSpan(std::span<int, 3>(iArr2, 3), 0);
108 testRuntimeSpan(std::span<int, 3>(iArr2, 3), 1);
109 testRuntimeSpan(std::span<int, 3>(iArr2, 3), 2);
110
111 testRuntimeSpan(std::span<int, 4>(iArr2, 4), 0);
112 testRuntimeSpan(std::span<int, 4>(iArr2, 4), 1);
113 testRuntimeSpan(std::span<int, 4>(iArr2, 4), 2);
114 testRuntimeSpan(std::span<int, 4>(iArr2, 4), 3);
115
116 std::string s;
117 testRuntimeSpan(std::span<std::string> (&s, 1), 0);
118 testRuntimeSpan(std::span<std::string, 1>(&s, 1), 0);
119 }
120